Staff profile

Research Interests (Astronomy)

My research focuses on the study of interacting binaries. These are systems that are comprised a compact object (Black Hole, Neutron Star or White Dwarf) in a close binary orbit with a (usually) less evolved star. I use the variability of the light emitted from such sources to probe the different components of the binary (the donor star, accretion disk, compact object and out-flowing jet). This involves observing the sources at a number of wavelengths to probe the different regions. These include X-rays (RXTE, SWIFT and XMM), Optical/UV (VLT, Keck, WHT, Palomar 200-inch and HST) and Infra-red (VLT) observations. I combine these observations to indirectly image the systems in order to better understand the interactions of light and matter in these extreme physical environments.

Research Interests (Instrumentation)

My research focuses on the development of instrumenation based around Kinetic Inductance Detectors (KIDs). These are superconducting detectors that are capable of measuring the arrival time of individual optical/near-IR photons to ~1microsecond and simultaneously measuring their energy to ~5-10%. I am working with teams in Europe and the US to develop uniquely powerful instruments based around arrays of 1000's of such devices.

• Centre for Advanced Instrumentation

Conference Paper

• CUBES: application of image slicers to reformat the field for two spectral resolving powers
  
  Calcines Rosario, A. Z., Wells, M., O’Brien, K. S., Morris, S. L., Seifert, W., Zanutta, A., Evans, C., & Di Marcantonio, P. (2022). CUBES: application of image slicers to reformat the field for two spectral resolving powers. In R. Navarro & R. Geyl (Eds.), Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; SPIE Astronomical Telescopes + Instrumentation. SPIE. https://doi.org/10.1117/12.2626233
• The E-ELT first light spectrograph HARMONI: capabilities and modes
  
  Thatte, N. A., Clarke, F., Bryson, I., Shnetler, H., Tecza, M., Fusco, T., Bacon, R. M., Richard, J., Mediavilla, E., Neichel, B., Arribas, S., Garcia-Lorenzo, B., Remillieux, A., El Madi, K., Herreros, J. M., Melotte, D., O’Brien, K., Tosh, I. A., Vernet, J., … Evans, C. J. (2016). The E-ELT first light spectrograph HARMONI: capabilities and modes. In L. Simard, H. Takami, & C. J. Evans (Eds.), Proceedings Volume 9908, Ground-based and Airborne Instrumentation for Astronomy VI. SPIE. https://doi.org/10.1117/12.2230629

Journal Article

• Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag
  
  Ulgiati, A., Vincentelli, F. M., Casella, P., Veledina, A., Maccarone, T. J., Russell, D. M., Uttley, P., Ambrosino, F., Baglio, M. C., Imbrogno, M., Melandri, A., Motta, S. E., O’Brien, K., Sanna, A., Shahbaz, T., Altamirano, D., Fender, R. P., Maitra, D., & Malzac, J. (2024). Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag. Astronomy & Astrophysics, 690, Article A239. https://doi.org/10.1051/0004-6361/202450545
• Links between optical and X-ray light in Cygnus X-2
  
  Igl, A. B., Hynes, R. I., O’Brien, K. S., Robinson, E. L., & Britt, C. T. (2024). Links between optical and X-ray light in Cygnus X-2. Monthly Notices of the Royal Astronomical Society, 532(1), 241-258. https://doi.org/10.1093/mnras/stae1262
• Links between optical and X-ray light in Scorpius X-1
  
  Igl, A. B., Hynes, R. I., Britt, C. T., O’Brien, K. S., & Mikles, V. J. (2023). Links between optical and X-ray light in Scorpius X-1. Monthly Notices of the Royal Astronomical Society, 526(1), 645–660. https://doi.org/10.1093/mnras/stad2721
• Sub-second infrared variability from the archetypal accreting neutron star 4U 1728−34
  
  Vincentelli, F. M., Casella, P., Borghese, A., Cavecchi, Y., Mastroserio, G., Stella, L., Altamirano, D., Padilla, M. A., Baglio, M. C., Belloni, T. M., Casares, J., Cúneo, V. A., Degenaar, N., Trigo, M. D., Fender, R., Maccarone, T., Malzac, J., Sánchez, D. M., Middleton, M., … Uttley, P. (2023). Sub-second infrared variability from the archetypal accreting neutron star 4U 1728−34. Monthly Notices of the Royal Astronomical Society, 525(2), 2509-2518. https://doi.org/10.1093/mnras/stad2414
• Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions
  
  Calcines, A., Wells, M., O’Brien, K., Morris, S., Seifert, W., Zanutta, A., Evans, C., & Di Marcantonio, P. (2023). Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions. Experimental Astronomy., 55(1), 267-280. https://doi.org/10.1007/s10686-022-09866-5
• Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling
  
  Vincentelli, F., Casella, P., Russell, D., Baglio, M., Veledina, A., Maccarone, T., Malzac, J., Fender, R., O’Brien, K., & Uttley, P. (2021). Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling. Monthly Notices of the Royal Astronomical Society, 503(1), 614-624. https://doi.org/10.1093/mnras/stab475
• First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications
  
  Dodkins, R. H., Davis, K. K., Lewis, B., Mahashabde, S., Mazin, B. A., Lipartito, I. A., Fruitwala, N., O’Brien, K., & Thatte, N. (2020). First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications. Publications of the Astronomical Society of the Pacific, 132(1016), Article 104503. https://doi.org/10.1088/1538-3873/aba9e4
• KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph
  
  O’Brien, K. (2020). KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph. Journal of Low Temperature Physics, 199(1-2), 537-546. https://doi.org/10.1007/s10909-020-02347-z
• Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4
  
  Vincentelli, F., Casella, P., Petrucci, P., Maccarone, T., Russell, D., Uttley, P., Marco, B. D., Fender, R., Gandhi, P., Malzac, J., O’Brien, K., & Tomsick, J. (2019). Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4. Astrophysical Journal Letters, 887(1), Article L19. https://doi.org/10.3847/2041-8213/ab5860
• A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535–571
  
  Cristina Baglio, M., Russell, D. M., Casella, P., Al Noori, H., Al Yazeedi, A., Belloni, T., Buckley, D. A., Cadolle Bel, M., Ceccobello, C., Corbel, S., Coti Zelati, F., Díaz Trigo, M., Fender, R. P., Gallo, E., Gandhi, P., Homan, J., Koljonen, K. I., Lewis, F., Maccarone, T. J., … Vincentelli, F. M. (2018). A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535–571. Astrophysical Journal, 867(2), Article 114. https://doi.org/10.3847/1538-4357/aae532
• A jet model for the fast IR variability of the black hole X-ray binary GX 339-4
  
  Malzac, J., Kalamkar, M., Vincentelli, F., Vue, A., Drappeau, S., Belmont, R., Casella, P., Clavel, M., Corbel, S., Coriat, M., Dornic, D., Ferreira, J., Henri, G., Maccarone, T. J., Marcowith, A., O’Brien, K., Péault, M., Petrucci, P.-O., Rodriguez, J., … Uttley, P. (2018). A jet model for the fast IR variability of the black hole X-ray binary GX 339-4. Monthly Notices of the Royal Astronomical Society, 480(2), 2054-2071. https://doi.org/10.1093/mnras/sty2006
• Characterization of the infrared/X-ray subsecond variability for the black hole transient GX 339-4
  
  Vincentelli, F., Casella, P., Maccarone, T., Uttley, P., Gandhi, P., Belloni, T., De Marco, B., Russell, D., Stella, L., & O’Brien, K. (2018). Characterization of the infrared/X-ray subsecond variability for the black hole transient GX 339-4. Monthly Notices of the Royal Astronomical Society, 477(4), 4524-4533. https://doi.org/10.1093/mnras/sty710
• MKID digital readout tuning with deep learning
  
  Dodkins, R., Mahashabde, S., O’Brien, K., Thatte, N., Fruitwala, N., Walter, A., Meeker, S., Szypryt, P., & Mazin, B. (2018). MKID digital readout tuning with deep learning. Astronomy and Computing, 23, 60-71. https://doi.org/10.1016/j.ascom.2018.03.001
• System mass constraints for the accreting millisecond pulsar XTE J1814-338 using Bowen fluorescence
  
  Wang, L., Steeghs, D., Casares, J., Charles, P., Muñoz-Darias, T., Marsh, T., Hynes, R., & O’Brien, K. (2017). System mass constraints for the accreting millisecond pulsar XTE J1814-338 using Bowen fluorescence. Monthly Notices of the Royal Astronomical Society, 466(2), 2261-2271. https://doi.org/10.1093/mnras/stw3312
• Detection of the first infra-red quasi-periodic oscillation in a black hole X-ray binary
  
  Kalamkar, M., Casella, P., Uttley, P., O’Brien, K., Russell, D., Maccarone, T., van der Klis, M., & Vincentelli, F. (2016). Detection of the first infra-red quasi-periodic oscillation in a black hole X-ray binary. Monthly Notices of the Royal Astronomical Society, 460(3), 3284-3291. https://doi.org/10.1093/mnras/stw1211
• Simulated stellar kinematics studies of high-redshift galaxies with the HARMONI Integral Field Spectrograph
  
  Kendrew, S., Zieleniewski, S., Houghton, R., Thatte, N., Devriendt, J., Tecza, M., Clarke, F., O’Brien, K., & Häußler, B. (2016). Simulated stellar kinematics studies of high-redshift galaxies with the HARMONI Integral Field Spectrograph. Monthly Notices of the Royal Astronomical Society, 458(3), 2405-2422. https://doi.org/10.1093/mnras/stw438
• Correlated Optical and X-ray variability in V404 Cyg
  
  Gandhi, P., Shaw, A., Pahari, M., Littlefair, S., Hardy, L., Dhillon, V., Marsh, T., Casella, P., Charles, P., Done, C., Russell, D., Shahbaz, T., Casares, J., Munoz-Darias, T., Tomsick, J., O’Brien, K., Kuulkers, E., Altamirano, D., Knigge, C., … Walton, D. (2015). Correlated Optical and X-ray variability in V404 Cyg. The Astronomer’s Telegram, 7727.
• Erratum: ULTRASPEC: a high-speed imaging photometer on the 2.4-m Thai National Telescope
  
  Dhillon, V., Marsh, T., Atkinson, D., Bezawada, N., Bours, M., Copperwheat, C., Gamble, T., Hardy, L., Hickman, R., Irawati, P., Ives, D., Kerry, P., Leckngam, A., Littlefair, S., McLay, S., O’Brien, K., Peacocke, P., Poshyachinda, S., Richichi, A., … Vick, A. (2015). Erratum: ULTRASPEC: a high-speed imaging photometer on the 2.4-m Thai National Telescope. Monthly Notices of the Royal Astronomical Society, 446.
• The ARCONS Pipeline: Data Reduction for MKID Arrays
  
  van Eyken, J., Strader, M., Walter, A., Meeker, S., Szypryt, P., Stoughton, C., O’Brien, K., Marsden, D., Rice, N., Lin, Y., & Mazin, B. (2015). The ARCONS Pipeline: Data Reduction for MKID Arrays. Astrophysical Journal Supplement, 219.
• Direct detection of SDSS J0926+3624 orbital expansion with ARCONS
  
  Szypryt, P., Duggan, G., Mazin, B., Meeker, S., Strader, M., van Eyken, J., Marsden, D., O’Brien, K., Walter, A., Ulbricht, G., Prince, T., Stoughton, C., & Bumble, B. (2014). Direct detection of SDSS J0926+3624 orbital expansion with ARCONS. Monthly Notices of the Royal Astronomical Society, 439(3), 2765-2770. https://doi.org/10.1093/mnras/stu137
• ULTRASPEC: a high-speed imaging photometer on the 2.4-m Thai National Telescope
  
  Dhillon, V., Marsh, T., Atkinson, D., Bezawada, N., Bours, M., Copperwheat, C., Gamble, T., Hardy, L., Hickman, R., Irawati, P., Ives, D., Kerry, P., Leckngam, A., Littlefair, S., McLay, S., O’Brien, K., Peacocke, P., Poshyachinda, S., Richichi, A., … Vick, A. (2014). ULTRASPEC: a high-speed imaging photometer on the 2.4-m Thai National Telescope. Monthly Notices of the Royal Astronomical Society, 444, 4009-4021.
• Jet spectral breaks in black hole X-ray binaries
  
  Russell, D., Markoff, S., Casella, P., Cantrell, A., Chatterjee, R., Fender, R., Gallo, E., Gandhi, P., Homan, J., Maitra, D., Miller-Jones, J., O’Brien, K., & Shahbaz, T. (2013). Jet spectral breaks in black hole X-ray binaries. Monthly Notices of the Royal Astronomical Society, 429, 815-832.
• Giga-z: A 100,000 Object Superconducting Spectrophotometer for LSST Follow-up
  
  Marsden, D. W., Mazin, B. A., O’Brien, K., & Hirata, C. (2013). Giga-z: A 100,000 Object Superconducting Spectrophotometer for LSST Follow-up. Astrophysical Journal Supplement, 208.
• An Evolving Compact Jet in the Black Hole X-Ray Binary MAXI J1836-194
  
  Russell, D., Russell, T., Miller-Jones, J., O’Brien, K., Soria, R., Sivakoff, G., Slaven-Blair, T., Lewis, F., Markoff, S., Homan, J., Altamirano, D., Curran, P., Rupen, M., Belloni, T., Cadolle Bel, M., Casella, P., Corbel, S., Dhawan, V., Fender, R., … Tudose, V. (2013). An Evolving Compact Jet in the Black Hole X-Ray Binary MAXI J1836-194. Astrophysical Journal, 768.
• ARCONS: A 2024 Pixel Optical through Near-IR Cryogenic Imaging Spectrophotometer
  
  Mazin, B., Meeker, S., Strader, M., Szypryt, P., Marsden, D., van Eyken, J., Duggan, G., Walter, A., Ulbricht, G., Johnson, M., Bumble, B., O’Brien, K., & Stoughton, C. (2013). ARCONS: A 2024 Pixel Optical through Near-IR Cryogenic Imaging Spectrophotometer. Publications of the Astronomical Society of the Pacific, 125.
• Excess Optical Enhancement Observed with ARCONS for Early Crab Giant Pulses
  
  Strader, M., Johnson, M., Mazin, B., Spiro Jaeger, G., Gwinn, C., Meeker, S., Szypryt, P., van Eyken, J., Marsden, D., O’Brien, K., Walter, A., Ulbricht, G., Stoughton, C., & Bumble, B. (2013). Excess Optical Enhancement Observed with ARCONS for Early Crab Giant Pulses. Astrophysical Journal, 779.
• A late jet rebrightening revealed from multiwavelength monitoring of the black hole candidate XTE J1752-223
  
  Russell, D., Curran, P., Muñoz-Darias, T., Lewis, F., Motta, S., Stiele, H., Belloni, T., Miller-Jones, J., Jonker, P., O’Brien, K., Homan, J., Casella, P., Gandhi, P., Soleri, P., Markoff, S., Maitra, D., Gallo, E., & Cadolle Bel, M. (2012). A late jet rebrightening revealed from multiwavelength monitoring of the black hole candidate XTE J1752-223. Monthly Notices of the Royal Astronomical Society, 419, 1740-1751.
• A superconducting focal plane array for ultraviolet, optical, and near-infrared astrophysics
  
  Mazin, B. A., Bumble, B., Meeker, S. R., O’Brien, K., McHugh, S., & Langman, E. (2012). A superconducting focal plane array for ultraviolet, optical, and near-infrared astrophysics. Optics Express, 20.
• The near-infrared counterpart of 4U 1636-53
  
  Russell, D., O’Brien, K., Muñoz-Darias, T., Casella, P., Gandhi, P., & Revnivtsev, M. (2012). The near-infrared counterpart of 4U 1636-53. Astronomy and Astrophysics., 539.
• The nature of the X-ray transient MAXI J0556-332
  
  Cornelisse, R., D’Avanzo, P., Campana, S., Casares, J., Charles, P., Israel, G., Muñoz-Darias, T., O’Brien, K., Steeghs, D., Stella, L., & Torres, M. (2012). The nature of the X-ray transient MAXI J0556-332. Monthly Notices of the Royal Astronomical Society, 420, 3538-3544.
• A readout for large arrays of microwave kinetic inductance detectors
  
  McHugh, S., Mazin, B. A., Serfass, B., Meeker, S., O’Brien, K., Duan, R., Raffanti, R., & Werthimer, D. (2012). A readout for large arrays of microwave kinetic inductance detectors. Review of Scientific Instruments, 83.
• Optical atmospheric extinction over Cerro Paranal
  
  Patat, F., Moehler, S., O’Brien, K., Pompei, E., Bensby, T., Carraro, G., de Ugarte Postigo, A., Fox, A., Gavignaud, I., James, G., Korhonen, H., Ledoux, C., Randall, S., Sana, H., Smoker, J., Stefl, S., & Szeifert, T. (2011). Optical atmospheric extinction over Cerro Paranal. Astronomy and Astrophysics., 527.
• High time resolution optical/X-ray cross-correlations for X-ray binaries: anticorrelations and rapid variability
  
  Durant, M., Shahbaz, T., Gandhi, P., Cornelisse, R., Muñoz-Darias, T., Casares, J., Dhillon, V., Marsh, T., Spruit, H., O’Brien, K., Steeghs, D., & Hynes, R. (2011). High time resolution optical/X-ray cross-correlations for X-ray binaries: anticorrelations and rapid variability. Monthly Notices of the Royal Astronomical Society, 410, 2329-2338.
• Bright mid-infrared detections of MAXI J1836-194 with VISIR on the VLT: brightening of the compact jet
  
  Russell, D., Belloni, T., Miller-Jones, J., O’Brien, K., Gandhi, P., Cadolle Bel, M., Markoff, S., Casella, P., Homan, J., Gallo, E., Fender, R., Shahbaz, T., & Corbel, S. (2011). Bright mid-infrared detections of MAXI J1836-194 with VISIR on the VLT: brightening of the compact jet. The Astronomer’s Telegram, 3689.
• Correction of Field Rotator-Induced Flat-Field Systematics--A Case Study Using Archived VLT-FORS Data
  
  Moehler, S., Freudling, W., Møller, P., Patat, F., Rupprecht, G., & O’Brien, K. (2010). Correction of Field Rotator-Induced Flat-Field Systematics--A Case Study Using Archived VLT-FORS Data. Publications of the Astronomical Society of the Pacific, 122.
• Fast infrared variability from a relativistic jet in GX 339-4
  
  Casella, P., Maccarone, T., O’Brien, K., Fender, R., Russell, D., van der Klis, M., Pe’Er, A., Maitra, D., Altamirano, D., Belloni, T., Kanbach, G., Klein-Wolt, M., Mason, E., Soleri, P., Stefanescu, A., Wiersema, K., & Wijnands, R. (2010). Fast infrared variability from a relativistic jet in GX 339-4. Monthly Notices of the Royal Astronomical Society, 404, L21-L25.
• FORS in the Era of Second Generation VLT Instrumentation
  
  O’Brien, K. (2009). FORS in the Era of Second Generation VLT Instrumentation. Astrophysics and Space Science Proceedings, 9.
• Dynamical constraints on the neutron star mass in EXO 0748-676
  
  Muñoz-Darias, T., Casares, J., O’Brien, K., Steeghs, D., Martínez-Pais, I., Cornelisse, R., & Charles, P. (2009). Dynamical constraints on the neutron star mass in EXO 0748-676. Monthly Notices of the Royal Astronomical Society, 394, L136-L140.
• The First Polarimetric Signatures of Infrared Jets in X-Ray Binaries
  
  Shahbaz, T., Fender, R., Watson, C., & O’Brien, K. (2008). The First Polarimetric Signatures of Infrared Jets in X-Ray Binaries. Astrophysical Journal, 672. https://doi.org/10.1086/523793
• FORS1 is getting Blue: New Blue Optimised Detectors and High Throughput Filters
  
  Szeifert, T., Reiss, R., Baksai, P., Deiries, S., Izzo, C., Jehin, E., Kiekebusch, M., Moehler, S., O’Brien, K., Pompei, E., Riquelme, M., Rupprecht, G., & Shen, T.-C. (2007). FORS1 is getting Blue: New Blue Optimised Detectors and High Throughput Filters. Messenger., 128.
• ULTRACAM: an ultrafast, triple-beam CCD camera for high-speed astrophysics
  
  Dhillon, V., Marsh, T., Stevenson, M., Atkinson, D., Kerry, P., Peacocke, P., Vick, A., Beard, S., Ives, D., Lunney, D., McLay, S., Tierney, C., Kelly, J., Littlefair, S., Nicholson, R., Pashley, R., Harlaftis, E., & O’Brien, K. (2007). ULTRACAM: an ultrafast, triple-beam CCD camera for high-speed astrophysics. Monthly Notices of the Royal Astronomical Society, 378, 825-840.
• Towards Precision Photometry with FORS: A Status Report
  
  Freudling, W., Møller, P., Patat, F., Moehler, S., Romaniello, M., Jehin, E., O’Brien, K., Izzo, C., Depagne, E., Pompei, E., Naef, D., Rupprecht, G., & Järvinen, A. (2007). Towards Precision Photometry with FORS: A Status Report. Messenger., 128.
• A signature of the donor star in the extra-galactic X-ray binary LMCX-2
  
  Cornelisse, R., Steeghs, D., Casares, J., Charles, P., Shih, I., Hynes, R., & O’Brien, K. (2007). A signature of the donor star in the extra-galactic X-ray binary LMCX-2. Monthly Notices of the Royal Astronomical Society, 381, 194-200.
• VSOP: the variable star one-shot project. I. Project presentation and first data release
  
  Dall, T., Foellmi, C., Pritchard, J., Lo Curto, G., Allende Prieto, C., Bruntt, H., Amado, P., Arentoft, T., Baes, M., Depagne, E., Fernandez, M., Ivanov, V., Koesterke, L., Monaco, L., O’Brien, K., Sarro, L., Saviane, I., Scharwächter, J., Schmidtobreick, L., … Sterzik, M. (2007). VSOP: the variable star one-shot project. I. Project presentation and first data release. Astronomy and Astrophysics., 470, 1201-1214.
• A detection of the donor star of Aquila X-1 during its 2004 outburst?
  
  Cornelisse, R., Casares, J., Steeghs, D., Barnes, A., Charles, P., Hynes, R., & O’Brien, K. (2007). A detection of the donor star of Aquila X-1 during its 2004 outburst?. Monthly Notices of the Royal Astronomical Society, 375, 1463-1470.
• Optical spectroscopy of the low-mass X-ray binary GX9+9
  
  Cornelisse, R., Steeghs, D., Casares, J., Charles, P., Barnes, A., Hynes, R., & O’Brien, K. (2007). Optical spectroscopy of the low-mass X-ray binary GX9+9. Monthly Notices of the Royal Astronomical Society, 380, 1219-1229.
• Kinematical studies of the low-mass X-ray binary GRMus (XB1254-690)
  
  Barnes, A., Casares, J., Cornelisse, R., Charles, P., Steeghs, D., Hynes, R., & O’Brien, K. (2007). Kinematical studies of the low-mass X-ray binary GRMus (XB1254-690). Monthly Notices of the Royal Astronomical Society, 380, 1182-1190.
• Multiwavelength Observations of EXO 0748-676. I. Reprocessing of X-Ray Bursts
  
  Hynes, R., Horne, K., O’Brien, K., Haswell, C., Robinson, E., King, A., Charles, P., & Pearson, K. (2006). Multiwavelength Observations of EXO 0748-676. I. Reprocessing of X-Ray Bursts. Astrophysical Journal, 648, 1156-1168.
• Optical identification of IGR J19140+0951
  
  in’t Zand, J., Jonker, P., Nelemans, G., Steeghs, D., & O’Brien, K. (2006). Optical identification of IGR J19140+0951. Astronomy and Astrophysics., 448, 1101-1106.
• Multiwavelength Observations of EXO 0748-676. II. Emission-Line Behavior
  
  Pearson, K., Hynes, R., Steeghs, D., Jonker, P., Haswell, C., King, A., O’Brien, K., Nelemans, G., & Méndez, M. (2006). Multiwavelength Observations of EXO 0748-676. II. Emission-Line Behavior. Astrophysical Journal, 648, 1169-1180.
• Detection of the irradiated donor in the LMXBs 4U 1636-536 (=V801 Ara) and 4U 1735-444 (=V926 Sco)
  
  Casares, J., Cornelisse, R., Steeghs, D., Charles, P., Hynes, R., O’Brien, K., & Strohmayer, T. (2006). Detection of the irradiated donor in the LMXBs 4U 1636-536 (=V801 Ara) and 4U 1735-444 (=V926 Sco). Monthly Notices of the Royal Astronomical Society, 373, 1235-1244.
• Chandra imaging of IGR J16493-4348
  
  Kuiper, L., Jonker, P., Hermsen, W., & O’Brien, K. (2005). Chandra imaging of IGR J16493-4348. The Astronomer’s Telegram, 654.
• GRB 050520: VLT/ULTRACAM observations
  
  Vreeswijk, P., Marsh, T., Littlefair, S., Dhillon, V., & O’Brien, K. (2005). GRB 050520: VLT/ULTRACAM observations. GRB Coordinates Network, 3445.
• The 2003 radio outburst of a new X-ray transient: XTE J1720-318
  
  Brocksopp, C., Corbel, S., Fender, R., Rupen, M., Sault, R., Tingay, S., Hannikainen, D., & O’Brien, K. (2005). The 2003 radio outburst of a new X-ray transient: XTE J1720-318. Monthly Notices of the Royal Astronomical Society, 356, 125-130.
• The Visit of Prof. R. Sunayev and the Topical Meeting "Accretion onto Compact Objects"
  
  Alloin, D., Mason, E., & O’Brien, K. (2004). The Visit of Prof. R. Sunayev and the Topical Meeting "Accretion onto Compact Objects". Messenger., 116.
• Spectroscopy of the optical counterpart to Ser X-1
  
  Hynes, R., Charles, P., van Zyl, L., Barnes, A., Steeghs, D., O’Brien, K., & Casares, J. (2004). Spectroscopy of the optical counterpart to Ser X-1. Monthly Notices of the Royal Astronomical Society, 348, 100-104.
• High-speed Keck II and RXTE spectroscopy of Cygnus X-2 - I. Three X-ray components revealed by correlated variability
  
  O’Brien, K., Horne, K., Gomer, R. H., Oke, J., & van der Klis, M. (2004). High-speed Keck II and RXTE spectroscopy of Cygnus X-2 - I. Three X-ray components revealed by correlated variability. Monthly Notices of the Royal Astronomical Society, 350, 587-595.
• The Distance and Interstellar Sight Line to GX 339-4
  
  Hynes, R., Steeghs, D., Casares, J., Charles, P., & O’Brien, K. (2004). The Distance and Interstellar Sight Line to GX 339-4. Astrophysical Journal, 609, 317-324.
• Bowen Fluorescence from the Companion Star in X1822-371
  
  Casares, J., Steeghs, D., Hynes, R., Charles, P., & O’Brien, K. (2003). Bowen Fluorescence from the Companion Star in X1822-371. Astrophysical Journal, 590, 1041-1048.
• The remarkable rapid X-ray, ultraviolet, optical and infrared variability in the black hole XTE J1118+480
  
  Hynes, R., Haswell, C., Cui, W., Shrader, C., O’Brien, K., Chaty, S., Skillman, D., Patterson, J., & Horne, K. (2003). The remarkable rapid X-ray, ultraviolet, optical and infrared variability in the black hole XTE J1118+480. Monthly Notices of the Royal Astronomical Society, 345, 292-310.
• Improved IR (ISAAC/VLT) and radio (ATCA) astrometry of the likely counterpart to XTE J1720-318
  
  O’Brien, K., Clarke, F., Fender, R., Brocksopp, C., Steeghs, D., Hynes, R., & Charles, P. (2003). Improved IR (ISAAC/VLT) and radio (ATCA) astrometry of the likely counterpart to XTE J1720-318. The Astronomer’s Telegram, 117.
• High-speed Keck spectroscopy of flares and oscillations in AE Aquarii
  
  Skidmore, W., O’Brien, K., Horne, K., Gomer, R., Oke, J., & Pearson, K. (2003). High-speed Keck spectroscopy of flares and oscillations in AE Aquarii. Monthly Notices of the Royal Astronomical Society, 338, 1057-1066.
• Dynamical Evidence for a Black Hole in GX 339-4
  
  Hynes, R., Steeghs, D., Casares, J., Charles, P., & O’Brien, K. (2003). Dynamical Evidence for a Black Hole in GX 339-4. Astrophysical Journal, 583, L95-L98.
• Echoes in X-ray binaries
  
  O’Brien, K., Horne, K., Hynes, R., Chen, W., Haswell, C., & Still, M. (2002). Echoes in X-ray binaries. Monthly Notices of the Royal Astronomical Society, 334, 426-434.
• Spectral, polarization and time-lag properties of GRS 1915+105 radio oscillations
  
  Fender, R., Rayner, D., Trushkin, S., O’Brien, K., Sault, R., Pooley, G., & Norris, R. (2002). Spectral, polarization and time-lag properties of GRS 1915+105 radio oscillations. Monthly Notices of the Royal Astronomical Society, 330, 212-218.
• Atmospheric Reflection during an Anomalous Low State of Hercules X-1
  
  Still, M., O’Brien, K., Horne, K., Boroson, B., Titarchuk, L. G., Engle, K., Vrtilek, S. D., Quaintrell, H., & Fiedler, H. (2001). Atmospheric Reflection during an Anomalous Low State of Hercules X-1. Astrophysical Journal, 554, 352-361.
• Emission-line oscillations in the dwarf nova V2051 Ophiuchi
  
  Steeghs, D., O’Brien, K., Horne, K., Gomer, R., & Oke, J. (2001). Emission-line oscillations in the dwarf nova V2051 Ophiuchi. Monthly Notices of the Royal Astronomical Society, 323, 484-496.
• Multiwavelength Studies of Hercules X-1 during Short High and Anomalous Low States: On-again, Off-again
  
  Vrtilek, S., Quaintrell, H., Boroson, B., Still, M., Fiedler, H., O’Brien, K., & McCray, R. (2001). Multiwavelength Studies of Hercules X-1 during Short High and Anomalous Low States: On-again, Off-again. Astrophysical Journal, 549, 522-536.
• Keck II spectroscopy of mHz quasi-periodic oscillations in Hercules X-1
  
  O’Brien, K., Horne, K., Boroson, B., Still, M., Gomer, R., Oke, J., Boyd, P., & Vrtilek, S. (2001). Keck II spectroscopy of mHz quasi-periodic oscillations in Hercules X-1. Monthly Notices of the Royal Astronomical Society, 326, 1067-1075.
• RXTE Observations of Hercules X-1 during the 1998 July Short High State
  
  Still, M., O’Brien, K., Horne, K., Hudson, D., Boroson, B., Vrtilek, S. D., Quaintrell, H., & Fiedler, H. (2001). RXTE Observations of Hercules X-1 during the 1998 July Short High State. Astrophysical Journal, 553, 776-787.
• Discovery of Millihertz ULTRAVIOLET Quasi-periodic Oscillations in Hercules X-1
  
  Boroson, B., O’Brien, K., Horne, K., Kallman, T., Still, M., Boyd, P. T., Quaintrell, H., & Vrtilek, S. D. (2000). Discovery of Millihertz ULTRAVIOLET Quasi-periodic Oscillations in Hercules X-1. Astrophysical Journal, 545, 399-406.
• XTE J1859+226
  
  Hynes, R., Haswell, C., Norton, A., Chaty, S., Solheim, J., Ostensen, R., Abbott, T., Fried, R., McFarland, J., Rolfe, D., Lott, D., Ioannou, Z., Shafter, A., O’Brien, K., Horne, K., Krisciunas, K., & Ivison, R. (1999). XTE J1859+226. International Astronomical Union Circular, 7294.
• Optical and near-IR observations of XTE J1859+226
  
  Hynes, R., Haswell, C., Norton, A., Chaty, S., Rolfe, D., Lott, D., Solheim, J.-E., Ostensen, R., Garcia, R., Fried, R., O’Brien, K., Horne, K., Ioannou, Z., Shafter, A., Abbott, T., Krisciunas, K., Ivison, R., Sano, Y., Chen, W., … Wagner, R. (1999). Optical and near-IR observations of XTE J1859+226. The Astronomer’s Telegram, 50.
• Echoes from an irradiated disc in GRO J1655-40
  
  Hynes, R., O’Brien, K., Horne, K., Chen, W., & Haswell, C. (1998). Echoes from an irradiated disc in GRO J1655-40. Monthly Notices of the Royal Astronomical Society, 299, L37-L41.
• Faint galaxies close to QSOs with damped Lyman alpha absorption systems
  
  Aragon-Salamanca, A., Ellis, R. S., & O’Brien, K. S. (1996). Faint galaxies close to QSOs with damped Lyman alpha absorption systems. Monthly Notices of the Royal Astronomical Society, 281, 945-952.

Other (Print)

• Simulated observations of high-redshift galaxies with the HARMONI spectrograph for the European Extremely Large Telescope
  
  Kendrew, S., Zieleniewski, S., Houghton, R. C., Thatte, N., Devriendt, J., Tecza, M., Clarke, F., O’Brien, K., & Häußler, B. (2016). Simulated observations of high-redshift galaxies with the HARMONI spectrograph for the European Extremely Large Telescope.
• Characterizing the performance of cryogenic lens mounts for the HARMONI spectograph
  
  Allen, J. R., O’Brien, K., Lynn, J. D., Thatte, N. A., Tosh, I. A., & Tacon, M. (2016). Characterizing the performance of cryogenic lens mounts for the HARMONI spectograph.
• The E-ELT first light spectrograph HARMONI: capabilities and modes
  
  Thatte, N. A., Clarke, F., Bryson, I., Shnetler, H., Tecza, M., Fusco, T., Bacon, R. M., Richard, J., Mediavilla, E., Neichel, B., Arribas, S., Garcia-Lorenzo, B., Evans, C. J., Remillieux, A., El Madi, K., Herreros, J. M., Melotte, D., O’Brien, K., Tosh, I. A., … Larrieu, M. (2016). The E-ELT first light spectrograph HARMONI: capabilities and modes.
• A microwave kinetic inductance detector for the DAG telescope
  
  Güver, T., Mazin, B. A., O’Brien, K., Kay, B., Alis, S., Yelkenci, F. K., Yesilyaprak, C., Yerli, S. K., Erol, A., & Keskin, O. (2016). A microwave kinetic inductance detector for the DAG telescope.
• Science with KRAKENS
  
  Mazin, B. A., Becker, G., France, K., Fraser, W., Howell, D. A., Jones, T., Meeker, S., O’Brien, K., Prochaska, J. X., Siana, B., Strader, M., Szypryt, P., Tendulkar, S. P., Treu, T., & Vasisht, G. (2015). Science with KRAKENS.
• Fast multi-wavelength broad-band and QPO variability in a black hole X-ray binary: accretion flow and/or a jet origin?
  
  Kalamkar, M., Casella, P., O’Brien, K., Uttley, P., & Maccarone, T. (2015). Fast multi-wavelength broad-band and QPO variability in a black hole X-ray binary: accretion flow and/or a jet origin?.
• HARMONI: the first light integral field spectrograph for the E-ELT
  
  Thatte, N. A., Clarke, F., Bryson, I., Schnetler, H., Tecza, M., Bacon, R. M., Remillieux, A., Mediavilla, E., Herreros Linares, J. M., Arribas, S., Evans, C. J., Lunney, D. W., Fusco, T., O’Brien, K., Tosh, I. A., Ives, D. J., Finger, G., Houghton, R., Davies, R. L., … Neichel, B. (2014). HARMONI: the first light integral field spectrograph for the E-ELT.
• Integral field spectroscopy of high redshift galaxies with the HARMONI spectrograph on the European Extremely Large Telescope
  
  Kendrew, S., Zieleniewski, S., Thatte, N., Devriendt, J., Houghton, R., Fusco, T., Tecza, M., Clarke, F., & O’Brien, K. (2014). Integral field spectroscopy of high redshift galaxies with the HARMONI spectrograph on the European Extremely Large Telescope.
• Simultaneous independent measurements of a truncated inner accretion disc in the low/hard state of GX 399$-$4
  
  Plant, D., O’Brien, K., & Fender, R. (2014). Simultaneous independent measurements of a truncated inner accretion disc in the low/hard state of GX 399$-$4.
• The spectrograph units for the HARMONI integral field spectrograph
  
  O’Brien, K., Allen, J. R., Lynn, J. D., Thatte, N. A., Bryson, I., Clarke, F., Schnetler, H., & Tecza, M. (2014). The spectrograph units for the HARMONI integral field spectrograph.
• KIDSpec: an MKID based medium resolution integral field spectrograph
  
  O’Brien, K., Thatte, N., & Mazin, B. (2014). KIDSpec: an MKID based medium resolution integral field spectrograph.
• Cryogenic testing of components for the HARMONI spectrograph
  
  Allen, J. R., O’Brien, K., Lynn, J. D., Thatte, N. A., Bryson, I., Clarke, F., Schnetler, H., & Tecza, M. (2014). Cryogenic testing of components for the HARMONI spectrograph.
• Preliminary Results from the Array Camera for Optical to Near-IR Spectrophotometry (ARCONS)
  
  Mazin, B. A., O’Brien, K., Bumble, B., Strader, M., Meeker, S., Stoughton, C., Marsden, D., Walter, A., Szypyrt, P., & Ulbricht, G. (2013). Preliminary Results from the Array Camera for Optical to Near-IR Spectrophotometry (ARCONS).
• High resolution in three dimensions with SWIFT and PALM3K
  
  Clarke, F., Thatte, N., Tecza, M., O’Brien, K., Houghton, R., Tiee, D., Fletcher, L., Irwin, P., Verma, A., Dekany, R., Rick, B., Roberts, J., & Fini, L. (2013). High resolution in three dimensions with SWIFT and PALM3K.
• First Optical Observations with Microwave Kinetic Inductance Detectors
  
  Meeker, S., Mazin, B., O’Brien, K., McHugh, S., Bumble, B., Langman, E., & Navaroli, M. (2012). First Optical Observations with Microwave Kinetic Inductance Detectors.
• ARCONS: a Highly Multiplexed Superconducting UV-to-Near-IR Camera
  
  O’Brien, K., Mazin, B., McHugh, S., Meeker, S., Bumble, B., Hanisch, R., & Seaman, R. (2012). ARCONS: a Highly Multiplexed Superconducting UV-to-Near-IR Camera (pp. 385-388).
• SuperMOS: a new class of low resolution multiobject spectrographs
  
  Mazin, B. A., Marsden, D., & O’Brien, K. (2012). SuperMOS: a new class of low resolution multiobject spectrographs.
• ARCONS: a 1024 pixel superconducting integral field spectrograph
  
  O’Brien, K., Mazin, B., McHugh, S., Meeker, S., Marsden, D., & Bumble, B. (2012). ARCONS: a 1024 pixel superconducting integral field spectrograph.
• Optical lumped element microwave kinetic inductance detectors
  
  Marsden, D., Mazin, B. A., Bumble, B., Meeker, S., O’Brien, K., McHugh, S., Strader, M., & Langman, E. (2012). Optical lumped element microwave kinetic inductance detectors.
• Fast multiwavelength variability from jets in X-ray binaries
  
  Casella, P., Maccarone, T. J., & O’Brien, K. (2011). Fast multiwavelength variability from jets in X-ray binaries.
• Mapping LMXBs with reprocessed X-ray bursts
  
  Munoz-Darias, T., Martinez-Pais, I., Casares, J., O’Brien, K., Cornelisse, R., Dhillon, V., March, T., Steeghs, D., Charle, P., & Still, M. (2010). Mapping LMXBs with reprocessed X-ray bursts.
• Fast multiwavelength variability from jets in X-ray binaries
  
  Casella, P., Maccarone, T., & O’Brien, K. (2010). Fast multiwavelength variability from jets in X-ray binaries.
• ARCHONS: a highly multiplexed superconducting optical to near-IR camera
  
  Mazin, B. A., O’Brien, K., McHugh, S., Bumble, B., Moore, D., Golwala, S., & Zmuidzinas, J. (2010). ARCHONS: a highly multiplexed superconducting optical to near-IR camera.
• Fast Multiwavelength Variability from Jets in X-ray Binaries, a New Powerful Tool
  
  Casella, P., Maccarone, T., O’Brien, K., Fender, R., Russell, D., van der Klis, M., Pe’er, A., Maitra, D., Altamirano, D., Belloni, T., Kanbach, G., Klein-Wolt, M., Mason, E., Migliari, S., Soleri, P., Stefanescu, A., Wiersema, K., & Wijnands, R. (2010). Fast Multiwavelength Variability from Jets in X-ray Binaries, a New Powerful Tool.
• Echo-mapping of Scorpius X-1
  
  Britt, C. T., Hynes, R., Mikles, V., Robinson, E., & O’Brien, K. (2010). Echo-mapping of Scorpius X-1.
• The Bowen Survey; detecting donor star signatures in low mass X-ray binaries
  
  Cornelisse, R., Casares, J., Steeghs, D., Charles, P., Barnes, A., Hynes, R., O’Brien, K., & Muñoz-Darias, T. (2010). The Bowen Survey; detecting donor star signatures in low mass X-ray binaries.
• The astrophysics of ultra-compact binaries
  
  Nelemans, G., Wood, M., Groot, P., Anderson, S., Belczynski, K., Benacquista, M., Charles, P., Cumming, A., Deloye, C., Jonker, P., Kalogera, V., Knigge, C., Marsh, T., Motl, P., Napiwotzki, R., O’Brien, K., Phinney, E., Ramsay, G., Shahbaz, T., … Yungelson, L. (2009). The astrophysics of ultra-compact binaries.
• Polarimetric signatures of infrared jets in X-ray binaries
  
  Shahbaz, T., Fender, R., Watson, C., & O’Brien, K. (2009). Polarimetric signatures of infrared jets in X-ray binaries (pp. CD355-CD357).
• Fast Spectroscopy and Imaging with the FORS2 HIT Mode
  
  O’Brien, K., Leahy, D. A., & Hobill, D. W. (2008). Fast Spectroscopy and Imaging with the FORS2 HIT Mode.
• Polarimetric Signatures of Infrared Jets in X-ray Binaries
  
  Shahbaz, T., Fender, R., Watson, C., O’Brien, K., Wachter, S., Gelino, D., & Gelino, C. R. (2008). Polarimetric Signatures of Infrared Jets in X-ray Binaries (pp. 100-102).
• Bowen blend echo-tomography of low mass X-ray binaries
  
  Muñoz-Darias, T., Martínez-Pais, I., Casares, J., Cornelisse, R., Dhillon, V., Marsh, T., Steeghs, D., O’Brien, K., Charles, P., Still, M., Ryan, O., & Shearer, A. (2008). Bowen blend echo-tomography of low mass X-ray binaries (pp. 15-22).
• Echo Tomography of Cygnus X-2
  
  Hynes, R. I., Robinson, E. L., Bayless, A., O’Brien, K., Wachter, S., Gelino, D., & Gelino, C. R. (2008). Echo Tomography of Cygnus X-2 (pp. 198-200).
• The Variable Star One-shot Project, and its little child: Wikimbad
  
  Foellmi, C., Dall, T., Pritchard, J., Allende Prieto, C., Bruntt, H., Amado, P., Arentoft, T., Baes, M., Depagne, E., Fernandez, M., Ivanov, V., Koesterke, L., Monaco, L., O’Brien, K., Sarro, L., Saviane, I., Scharwaechter, J., Schmidtobreick, L., Schütz, O., … Osuna, P. (2008). The Variable Star One-shot Project, and its little child: Wikimbad.
• Bowen Blend Echo-tomography of Neutron Star LMXBs
  
  Muñoz-Darias, T., Martinez-Pais, I. G., Casares, J., Dhillon, V., Marsh, T., Steeghs, D., O’Brien, K., Charles, P., Still, M., & Cornelisse, R. (2008). Bowen Blend Echo-tomography of Neutron Star LMXBs.
• Bowen Blend Echo-Tomography of Sco X-l and V801 Ara
  
  Muñoz-Darias, T., Martínee-Pails, I., Casares, J., Cornelisse, R., Dhillon, V., Marsh, T., Steeghs, D., O’Brien, K., Charles, P., Still, M., Wachter, S., Gelino, D., & Gelino, C. R. (2008). Bowen Blend Echo-Tomography of Sco X-l and V801 Ara (pp. 207-209).
• FORS2 HIT Mode: Phase Resolved Spectroscopy of RXJ0806.3+1527
  
  Mason, E., Israel, G. L., O’Brien, K., Ryan, O., & Shearer, A. (2008). FORS2 HIT Mode: Phase Resolved Spectroscopy of RXJ0806.3+1527 (pp. 278-281).
• Modelling the Fringing of the FORS2 CCD
  
  Walsh, J., Kuntschner, H., Jehin, E., Kaufer, A., O’Brien, K., Riquelme, M., Smette, A., & Kerber, F. (2008). Modelling the Fringing of the FORS2 CCD.
• IOT Overview: Optical Multi-Object Spectrographs
  
  Schmidtobreick, L., Bagnulo, S., Jehin, E., Marconi, G., O’Brien, K., Pompei, E., Saviane, I., & Kerber, F. (2008). IOT Overview: Optical Multi-Object Spectrographs.
• Photometry with FORS
  
  Freudling, W., Møller, P., Patat, F., Moehler, S., Romaniello, M., Jehin, E., O’Brien, K., Izzo, C., Pompei, E., & Kerber, F. (2008). Photometry with FORS.
• An Overview of the Bowen Survey: Detecting Donor Star Signatures in Low Mass X-ray Binaries
  
  Cornelisse, R., Casares, J., Muñoz-Darias, T., Steeghs, D., Charles, P., Hynes, R., O’Brien, K., Barnes, A., Wachter, S., Gelino, D., & Gelino, C. R. (2008). An Overview of the Bowen Survey: Detecting Donor Star Signatures in Low Mass X-ray Binaries (pp. 148-152).
• ULTRASPEC: High-speed spectroscopy with zero readout noise
  
  Dhillon, V., Marsh, T., Copperwheat, C., Bezawada, N., Ives, D., Vick, A., O’Brien, K., Ryan, O., & Shearer, A. (2008). ULTRASPEC: High-speed spectroscopy with zero readout noise (pp. 132-139).
• Photometry with FORS at the ESO VLT
  
  Freudling, W., Romaniello, M., Patat, F., Møller, P., Jehin, E., & O’Brien, K. (2007). Photometry with FORS at the ESO VLT.
• High Speed Keck Spectroscopy of Flickering in AM Her
  
  Skidmore, W., Gomer, R., Horne, K., O’Brien, K., Oke, B., Pearson, K., & Cropper, M. (2004). High Speed Keck Spectroscopy of Flickering in AM Her.
• Disentangling X-ray Reprocessing Sites in EXO 0748-676
  
  Hynes, R., Haswell, C., Robinson, E., Horne, K., O’Brien, K., Charles, P., King, A., Rolfe, D., & Sion, E. (2004). Disentangling X-ray Reprocessing Sites in EXO 0748-676 (pp. 12-13).
• Bowen Fluorescence from Companion Stars in X-ray Binaries
  
  Casares, J., Steeghs, D., Hynes, R., Charles, P., Cornelisse, R., O’Brien, K., & Sion, E. (2004). Bowen Fluorescence from Companion Stars in X-ray Binaries (pp. 21-22).
• Rapid Keck Spectroscopy of Cataclysmic Variables
  
  Skidmore, W., Horne, K., Pearson, K., Gomer, R., O’Brien, K., Oke, B., & Sion, E. (2004). Rapid Keck Spectroscopy of Cataclysmic Variables (pp. 155-157).
• Dynamical Evidence for a Black Hole in GX339-4
  
  Hynes, R., Steeghs, D., Casares, J., Charles, P., & O’Brien, K. (2003). Dynamical Evidence for a Black Hole in GX339-4.
• X-ray/UV correlations in XTE J1118+480: disc, jet, or something else?
  
  Hynes, R., Haswell, C., Chaty, S., Cui, W., Shrader, C., O’Brien, K., Horne, K., Fuchs, Y., & Rodriguez, J. (2003). X-ray/UV correlations in XTE J1118+480: disc, jet, or something else?.
• Fireballs and oscillations in AE Aqr
  
  Skidmore, W., Pearson, K., O’Brien, K., Horne, K., Gomer, R., Beuermann, K., & Reinsch, K. (2002). Fireballs and oscillations in AE Aqr.
• Echoes in X-ray Binaries: Mapping the Accretion Flow
  
  O’Brien, K., Horne, K., Steeghs, D., & Cuypers, J. (2001). Echoes in X-ray Binaries: Mapping the Accretion Flow.
• Rapid optical spectroscopy of X-ray binaries with Keck II
  
  O’Brien, K. (2001). Rapid optical spectroscopy of X-ray binaries with Keck II.
• Atmospheric reflection during the anomalous low-state of Hercules X-1
  
  Still, M., O’Brien, K., Horne, K., Boroson, B., Vrtilek, S., Titarchuk, L., Quaintrell, H., & Fiedler, H. (2000). Atmospheric reflection during the anomalous low-state of Hercules X-1.
• Correlated X-ray and optical variability in X-ray Binaries
  
  O’Brien, K., & Horne, K. (2000). Correlated X-ray and optical variability in X-ray Binaries.
• Yet Another Multi wavelength Campaign on Hercules X-1/HZ Herculis
  
  Vrtilek, S., Boroson, B., Still, M., Fiedler, H., Quaintrell, H., & O’Brien, K. (1999). Yet Another Multi wavelength Campaign on Hercules X-1/HZ Herculis.
• An Observatory for Mapping Stellar Accretion Discs
  
  Still, M., O’Brien, K., & Horne, K. (1998). An Observatory for Mapping Stellar Accretion Discs.
• The 1996 Outburst of GRO J1655-40: The Challenge of Interpreting the Multiwavelength Spectra
  
  Hynes, R., Haswell, C., Shrader, C., Chen, W., Horne, K., Harlaftis, E., O’Brien, K., Hellier, C., Fender, R., Kuulkers, E., & Woodward, C. (1998). The 1996 Outburst of GRO J1655-40: The Challenge of Interpreting the Multiwavelength Spectra.
• Echo-sounding the accretion disks of X-ray binaries
  
  Still, M., O’Brien, K., & Horne, K. (1998). Echo-sounding the accretion disks of X-ray binaries.
• The 1996 Outburst of GRO J1655-40
  
  Hynes, R., Haswell, C., Fender, R., Shrader, C., Chen, W., Horne, K., Harlaftis, E., O’Brien, K., Hellier, C., Kemp, J., Kuulkers, E., & Woodward, C. (1998). The 1996 Outburst of GRO J1655-40.