All Outputs (135)

Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag (2024)
Journal Article
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

We report two epochs of simultaneous near-infrared (IR) and X-ray observations of the low-mass X-ray binary black hole candidate Swift J1753.5–0127 with a subsecond time resolution during its long 2005–2016 outburst. Data were collected strictly simu... Read More about Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag.

Links between optical and X-ray light in Cygnus X-2 (2024)
Journal Article
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

We observed the low-mass X-ray binary Cyg X-2 for a total of 18 nights over two observing runs in July and September of 2006, using the Otto Struve Telescope at McDonald Observatory and the Rossi X-ray Timing Explorer. Using discrete cross-correlatio... Read More about Links between optical and X-ray light in Cygnus X-2.

Links between optical and X-ray light in Scorpius X-1 (2023)
Journal Article
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

We observed the low-mass X-ray binary Sco X-1 for 12 nights simultaneously using the Rossi X-Ray Timing Explorer and the Otto Struve Telescope at McDonald Observatory at 1-s time-resolution. This is among the most comprehensive simultaneous X-Ray/opt... Read More about Links between optical and X-ray light in Scorpius X-1.

Sub-second infrared variability from the archetypal accreting neutron star 4U 1728−34 (2023)
Journal Article
Vincentelli, F. M., Casella, P., Borghese, A., Cavecchi, Y., Mastroserio, G., Stella, L., …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

We report on the first simultaneous high-time resolution X-ray and infrared (IR) observations of a neutron star low mass X-ray binary in its hard state. We performed ≈ 2 h of simultaneous observations of 4U 1728−34 using HAWK-I@VLT, XMM– Newton, and... Read More about Sub-second infrared variability from the archetypal accreting neutron star 4U 1728−34.

Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions (2022)
Journal Article
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

CUBES is a high efficiency spectrograph designed for a Cassegrain focus of the Very Large Telescope and is expected to be in operation in 2028. It is designed to observe point or compact sources in a spectral range from 300 to 405nm. CUBES will provi... Read More about Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions.

CUBES: application of image slicers to reformat the field for two spectral resolving powers (2022)
Presentation / Conference Contribution
Calcines Rosario, A. Z., Wells, M., O’Brien, K. S., Morris, S. L., Seifert, W., Zanutta, A., Evans, C., & Di Marcantonio, P. (2022, December). CUBES: application of image slicers to reformat the field for two spectral resolving powers. Presented at Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V

The Cassegrain U-Band Efficient Spectrograph (CUBES) is a high-efficiency spectrograph designed for observations from 305 to 400nm. It will be integrated at a Cassegrain focus of the Very Large Telescope (VLT). The image slicer technology is applied... Read More about CUBES: application of image slicers to reformat the field for two spectral resolving powers.

Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling (2021)
Journal Article
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

We present the results regarding the analysis of the fast X-ray/infrared (IR) variability of the black hole transient MAXI J1535−571. The data studied in this work consist of two strictly simultaneous observations performed with XMM–Newton (X-rays: 0... Read More about Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling.

First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications (2020)
Journal Article
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

Optical and near-infrared Microwave Kinetic Inductance Detectors, or MKIDs are low-temperature detectors with inherent spectral resolution that are able to instantly register individual photons with potentially no false counts or readout noise. These... Read More about First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications.

KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph (2020)
Journal Article
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

KIDSpec, the Kinetic Inductance Detector Spectrograph, is a concept for a highly sensitive, medium-spectral-resolution optical through near-IR spectrograph. It uses the intrinsic-energy-resolving capability of an array of optical/IR-sensitive MKIDs t... Read More about KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph.

Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4 (2019)
Journal Article
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

We present results from the first multi-epoch X-ray/IR fast-photometry campaign on the black hole transient GX 339–4, during its 2015 outburst decay. We studied the evolution of the power spectral densities finding strong differences between the two... Read More about Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4.

A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535–571 (2018)
Journal Article
Cristina Baglio, M., Russell, D. M., Casella, P., Al Noori, H., Al Yazeedi, A., Belloni, T., …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

We report on the results of optical, near-infrared (NIR), and mid-infrared observations of the black hole X-ray binary candidate (BHB) MAXI J1535–571 during its 2017/2018 outburst. During the first part of the outburst (MJD 58004–58012), the source s... Read More about A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535–571.

A jet model for the fast IR variability of the black hole X-ray binary GX 339-4 (2018)
Journal Article
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., Russell, D. M., & 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

Using the simultaneous Infra-Red (IR) and X-ray light curves obtained by Kalamkar et al., we perform a Fourier analysis of the IR/X-ray timing correlations of the black hole X-ray binary (BHB) GX 339-4. The resulting IR vs X-ray Fourier coherence and... Read More about A jet model for the fast IR variability of the black hole X-ray binary GX 339-4.

Characterization of the infrared/X-ray subsecond variability for the black hole transient GX 339-4 (2018)
Journal Article
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

We present a detailed analysis of the X-ray/IR fast variability of the Black-Hole Transient GX 339-4 during its low/hard state in 2008 August. Thanks to simultaneous high time resolution observations made with the VLT and RXTE, we performed the first... Read More about Characterization of the infrared/X-ray subsecond variability for the black hole transient GX 339-4.

MKID digital readout tuning with deep learning (2018)
Journal Article
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

Microwave Kinetic Inductance Detector (MKID) devices offer inherent spectral resolution, simultaneous read out of thousands of pixels, and photon-limited sensitivity at optical wavelengths. Before taking observations the readout power and frequency o... Read More about MKID digital readout tuning with deep learning.

System mass constraints for the accreting millisecond pulsar XTE J1814-338 using Bowen fluorescence (2017)
Journal Article
Wang, L., Steeghs, D., Casares, J., Charles, P., Muñoz-Darias, T., Marsh, T., …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

We present phase-resolved spectroscopy of the millisecond X-ray pulsar XTE J1814-338 obtained during its 2003 outburst. The spectra are dominated by high-excitation emission lines of He II λ4686, Hβ, and the Bowen blend C III/N III 4630–50 Å. We expl... Read More about System mass constraints for the accreting millisecond pulsar XTE J1814-338 using Bowen fluorescence.

The E-ELT first light spectrograph HARMONI: capabilities and modes (2016)
Other
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., Vernet, J., …Larrieu, M. (2016). The E-ELT first light spectrograph HARMONI: capabilities and modes

Simulated observations of high-redshift galaxies with the HARMONI spectrograph for the European Extremely Large Telescope (2016)
Other
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

A microwave kinetic inductance detector for the DAG telescope (2016)
Other
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

Characterizing the performance of cryogenic lens mounts for the HARMONI spectograph (2016)
Other
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 (2016)
Presentation / Conference Contribution
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., Hammersley, P., …Evans, C. J. (2016, December). The E-ELT first light spectrograph HARMONI: capabilities and modes. Presented at Ground-based and Airborne Instrumentation for Astronomy VI,: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh

HARMONI is the E-ELT’s first light visible and near-infrared integral field spectrograph. It will provide four different spatial scales, ranging from coarse spaxels of 60 × 30 mas best suited for seeing limited observations, to 4 mas spaxels that Nyq... Read More about The E-ELT first light spectrograph HARMONI: capabilities and modes.