Dr. Vinay L. Kashyap Profile

Dr. Vinay L. Kashyap

at Harvard-Smithsonian Ctr for Astrophysics

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 24 August 2021 Presentation + Paper

NExtUP: the Normal-incidence Extreme Ultraviolet Photometer

Jeremy Drake, Peter Cheimets, Cecilia Garraffo, Bradford Wargelin, Allison Youngblood, Vinay Kashyap, Paola Testa, David Caldwell, James Mason, Brian Fleming, Kevin France, Scott Wolk, Oswald Siegmund, Tommi Koskinen, Julian Alvarado-Gomez, Maria Mercedes Lopez-Morales, Guillaume Gronoff, Jay Bookbinder, Martin Barstow, David Windt, Randy Gladstone, Christopher Loghry, Rix Yarbrough

Proceedings Volume 11821, 1182108 (2021) https://doi.org/10.1117/12.2594408

KEYWORDS: Extreme ultraviolet, Stars, Sensors, Microchannel plates, Space operations, Photons, Multilayers, Planets, Exoplanets, Mirrors

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Proceedings Article | 11 September 2019 Paper

Evaluating the projected performance of Wolter-I x-ray telescope designs for SmallSats

L. Sethares, V. Cotroneo, J. Hong, V. Kashyap, S. Romaine

Proceedings Volume 11119, 111191Q (2019) https://doi.org/10.1117/12.2531526

KEYWORDS: Optical instrument design, X-ray telescopes, X-ray optics, Optical design, Telescopes, Astrophysics, Optical coatings, Space operations, Geometrical optics

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Proceedings Article | 9 September 2019 Presentation + Paper

SEEJ: SmallSat Exosphere Explorer of hot Jupiters

Scott Wolk, JaeSub Hong, Suzanne Romaine, Katja Poppenhaeger, Almus Kenter, Althea Moorhead, Dennis Gallagher, Christopher Moore, Martin Elvis, Ralph Kraft, Jeremy Drake, Vinay Kashyap, Elaine Winston, Bradford Wargelin, Ignazio Pillitteri, Diab Jerius, Mark Stahl, Bruce Wiegmann, Christopher Loghry

Proceedings Volume 11118, 111180E (2019) https://doi.org/10.1117/12.2529380

KEYWORDS: Jupiter, Stars, Planets, X-rays, X-ray detectors, Exoplanets, Atmospheric sciences, Magnetism, Atmospheric optics, Atmospheric sensing

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The first detected exoplanets found were "hot Jupiters"; these are large Jupiter-like planets in close orbits with their host star. The stars in these so-called "hot Jupiter systems" can have significant X-ray emission and the X-ray flux likely changes the evolution of the overall star-planetary system in at least two ways: (1) the intense high energy flux alters the structure of the upper atmosphere of the planet - in some cases leading to significant mass loss; (2) the angular momentum and magnetic field of the planet induces even more activity on the star, enhancing its X-rays, which are then subsequently absorbed by the planet. If the alignment of the systems is appropriate, the planet will transit the host star. The resulting drop in flux from the star allows us to measure the distribution of the low-density planetary atmosphere. We describe a science mission concept for a SmallSat Exosphere Explorer of hot Jupiters (SEEJ; pronounced "siege"). SEEJ will monitor the X-ray emission of nearby X-ray bright stars with transiting hot Jupiters in order to measure the lowest density portion of exoplanet atmospheres and the coronae of the exoplanet hosts. SEEJ will use revolutionary Miniature X-ray Optics (MiXO) and CMOS X-ray detectors to obtain sufficient collecting area and high sensitivity in a low mass, small volume and low-cost package. SEEJ will observe scores of transits occurring on select systems to make detailed measurements of the transit depth and shape which can be compared to out-of-transit behavior of the target system. The depth and duration of the flux change will allow us to characterize the exospheres of multiple hot Jupiters in a single year. In addition, the long baselines (covering multiple stellar rotation periods) from the transit data will allow us to characterize the temperature, flux and flare rates of the exoplanet hosts at an unprecedented level. This, in turn, will provide valuable constraints for models of atmospheric loss. In this contribution we outline the science of SEEJ and focus on the enabling technologies Miniature X-ray Optics and CMOS X-ray detectors.

Proceedings Article | 10 July 2018 Presentation

Concordance: In-flight calibration of x-ray telescopes without absolute references (Conference Presentation)

Herman Marshall, Vinay Kashyap, Matteo Guainazzi, Yang Chen, Xufei Wang, Xiao-Li Meng, Jeremy Drake

Proceedings Volume 10704, 107040G (2018) https://doi.org/10.1117/12.2314218

KEYWORDS: X-ray telescopes, Calibration, Statistical methods, Statistical analysis, Observatories, X-ray astronomy

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Proceedings Article | 12 July 2008 Paper

How to handle calibration uncertainties in high-energy astrophysics

Vinay Kashyap, Hyunsook Lee, Aneta Siemiginowska, Jonathan McDowell, Arnold Rots, Jeremy Drake, Pete Ratzlaff, Andreas Zezas, Rima Izem, Alanna Connors, David van Dyk, Taeyoung Park

Proceedings Volume 7016, 70160P (2008) https://doi.org/10.1117/12.788372

KEYWORDS: Calibration, Error analysis, Monte Carlo methods, Principal component analysis, Data modeling, Sensors, Statistical analysis, Data analysis, Point spread functions, Astronomy

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Proceedings Article | 19 September 2007 Paper

HRC-I gain correction

Jennifer Posson-Brown, Vinay Kashyap

Proceedings Volume 6686, 66860V (2007) https://doi.org/10.1117/12.740147

KEYWORDS: Sensors, Calibration, Autoregressive models, Adaptive optics, Error analysis, X-rays, Monte Carlo methods, Microchannel plates, Databases, X-ray astronomy

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Proceedings Article | 30 June 2006 Paper

Monte Carlo processes for including Chandra instrument response uncertainties in parameter estimation studies

Jeremy Drake, Peter Ratzlaff, Vinay Kashyap, Richard Edgar, Rima Izem, Diab Jerius, Aneta Siemiginowska, Alexey Vikhlinin

Proceedings Volume 6270, 62701I (2006) https://doi.org/10.1117/12.672226

KEYWORDS: Calibration, Monte Carlo methods, Quantum efficiency, Statistical analysis, X-rays, Data modeling, Contamination, Charge-coupled devices, Sensors, Error analysis

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Proceedings Article | 11 October 2004 Paper

Chandra HRC-S degapping corrections

Vinay Kashyap, Jeremy Drake, Sun Mi Chung

Proceedings Volume 5488, (2004) https://doi.org/10.1117/12.551790

KEYWORDS: Error analysis, Photons, Dispersion, Sensors, Amplifiers, Signal detection, Microchannel plates, Spectroscopy, Solids, Data corrections

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Proceedings Article | 11 October 2004 Paper

Characterizing nonlinearities in the Chandra LETG+HRC-S dispersion relation

Sun Mi Chung, Jeremy Drake, Vinay Kashyap, Peter Ratzlaff, Bradford Wargelin

Proceedings Volume 5488, (2004) https://doi.org/10.1117/12.552194

KEYWORDS: Sensors, Dispersion, Photons, Microchannel plates, Spectroscopy, Calibration, Data processing, X-rays, Iron, Cameras

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Proceedings Article | 3 February 2004 Paper

Characterizing nonlinearities in the Chandra LETGS + HRC-S dispersion relation

Sun Mi Chung, Jeremy Drake, Vinay Kashyap, Peter Ratzlaff, Bradford Wargelin

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.509360

KEYWORDS: Sensors, Dispersion, Calibration, Microchannel plates, X-rays, Imaging systems, Spectroscopy, Data processing, Spectrographs, Error analysis

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Proceedings Article | 3 February 2004 Paper

Chandra LETG higher-order diffraction efficiencies

Bradford Wargelin, Peter Ratzlaff, Deron Pease, Vinay Kashyap, Jeremy Drake

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.509361

KEYWORDS: Calibration, Sensors, Diffraction, Photons, Diffraction gratings, Energy efficiency, X-rays, Statistical analysis, Spectroscopy, Imaging spectroscopy

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Proceedings Article | 11 March 2003 Paper

In-flight effective area calibration of the Chandra low-energy transmission grating spectrometer

Deron Pease, Jeremy Drake, Vinay Kashyap, Herman Marshall, Erica Raffauf, Peter Ratzlaff, Bradford Wargelin

Proceedings Volume 4851, (2003) https://doi.org/10.1117/12.461275

KEYWORDS: Calibration, Quantum efficiency, Data modeling, X-rays, Spectroscopy, Diffraction, Dispersion, Observatories, Hydrogen, Microchannel plates

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Proceedings Article | 18 July 2000 Paper

Low-energy effective area of the Chandra low-energy transmission grating spectrometer

Deron Pease, Jeremy Drake, C. Olivia Johnson, Vinay Kashyap, Ralph Kraft, Peter Ratzlaff, Bradford Wargelin, A. Brinkman, Jelle Kaastra, Rob van der Meer, Frits Paerels, Vadim Burwitz, Peter Predehl, Herman Marshall, Martin Barstow, D. Finley, Jean Dupuis

Proceedings Volume 4012, (2000) https://doi.org/10.1117/12.391609

KEYWORDS: Calibration, X-rays, Quantum efficiency, Data modeling, Spectroscopy, Hydrogen, Atmospheric modeling, Error analysis, Observatories, Spectroscopes

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Showing 5 of 13 publications

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