Dr. Tiffany Meshkat Profile

Dr. Tiffany Meshkat

at Caltech

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 1 September 2021 Presentation + Paper

The Roman Space Telescope coronagraph technology demonstration: current status and relevance to future missions

B. Mennesson, V. P. Bailey, R. Zellem, N. Zimmerman, M. Ygouf, S. Hildebrandt, J. Rhodes, J. Kasdin, B. Macintosh, M. Turnbull, E. Douglas, A. Mandell, B. Nemati, G. Gonzalez, E. Cady, B. Kern, J. Krist, F. Shi, F. Mok, P. Morrissey, K. Heydorff, I. Pobereszhskiy, F. Zhao, T. Luchik, E. Maier, R. Akeson, L. Armus, J. Ingalls, P. Lowrance, T. Meshkat

Proceedings Volume 11823, 1182310 (2021) https://doi.org/10.1117/12.2603343

KEYWORDS: Coronagraphy, Electron multiplying charge coupled devices, Wavefront sensors, Cameras, Wavefronts, Imaging spectroscopy, Stars, Imaging systems, Spectroscopy, Polarimetry

Read Abstract +

SPIE Journal Paper | 28 May 2021 Open Access

Community exoplanet imaging data challenge for Roman CGI and starshade rendezvous

Margaret Turnbull, Neil Zimmerman, Julien Girard, Sergi R. Hildebrandt, Zhexing Li, Ell Bogat, Junellie Gonzalez-Quiles, Christopher Stark, Avi Mandell, Tiffany Meshkat, Stephen Kane

JATIS, Vol. 7, Issue 02, 021218, (May 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.021218

KEYWORDS: Planets, Exoplanets, Imaging systems, Signal to noise ratio, Stars, Coronagraphy, Telescopes, Data modeling, Point spread functions, Sensors

Read Abstract +

Operating in an unprecedented contrast regime (10 − 7 to 10 − 9), the Roman Coronagraph Instrument (CGI) will serve as a pathfinder for key technologies needed for future Earth-finding missions such as HabEx and LUVOIR. The Roman Exoplanet Imaging Data Challenge (Roman EIDC) was a community engagement effort that tasked participants with extracting exoplanets and their orbits for a 47-UMa-like target star given: (1) 15 years of simulated precursor radial velocity (RV) data and (2) six epochs of simulated imaging taken over the course of the Roman mission. Led by the Turnbull CGI Science Investigation Team, the Roman EIDC was preceded by four tutorial “hack-a-thon” events in Baltimore, Pasadena, New York City, and Tokyo. The Roman EIDC officially launched in October 2019 and ran for 8 months, offering a unique opportunity for exoplanet scientists of all experience levels to get acquainted with realistic near-future imaging data. The Roman EIDC simulated images include four epochs with CGI’s Hybrid Lyot Coronagraph (HLC) plus two epochs with a starshade (SS) assumed to arrive as part of a Starshade Rendezvous later in the mission. We focus on our in-house analysis of the outermost planet “d,” for which the SS’s higher throughput and lower noise floor present a factor of ∼4 improvement in the signal-to-noise ratio over the narrow-field HLC. We find that, although the RV detection was marginal for planet d, the precursor RV data enabled the mass and orbit to be constrained with only two epochs of SS imaging. Including the HLC images in the analysis results in improved measurements over RV + SS alone, with the greatest gains resulting from images taken at epochs near maximum elongation. Combining the two epochs of SS imaging with the RV + HLC data resulted in a factor of ∼2 better orbit and mass determinations over RV + HLC alone. In summary, the Roman CGI, combined with precursor RV data and latermission SS imaging, forms a powerful trifecta in detecting exoplanets and determining their masses, albedos, and system configurations. While the Roman CGI will break new scientific and technological ground with direct imaging of giant exoplanets within ∼5 AU of V ˜ 5 and brighter stars, a Roman Starshade Rendezvous mission would additionally enable the detection of planets out to ∼8 AU in those systems.

DOWNLOAD PAPER

Proceedings Article | 15 December 2020 Poster + Presentation + Paper

The Roman exoplanet imaging data challenge: a major community engagement effort

Julien Girard, Ell Bogat, Junellie Gonzalez-Quiles, Sergi Hildebrandt, Stephen Kane, Zhexing Li, Margaret Turnbull, Christopher Stark, Avi Mandell, Tiffany Meshkat, Neil Zimmerman

Proceedings Volume 11443, 1144337 (2020) https://doi.org/10.1117/12.2561736

KEYWORDS: Exoplanets, Coronagraphy, Planets, Imaging systems, Stars, Point spread functions, Astrophysics, Contamination, Light, Wavefronts

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

Exoplanet imaging data challenge: benchmarking the various image processing methods for exoplanet detection

F. Cantalloube, C. Gomez-Gonzalez, O. Absil, C. Cantero, R. Bacher, M. Bonse, M. Bottom, C.-H. Dahlqvist, C. Desgrange, O. Flasseur, T. Fuhrmann, Th. Henning, R. Jensen-Clem, M. Kenworthy, D. Mawet, D. Mesa, T. Meshkat, D. Mouillet, A. Müller, E. Nasedkin, B. Pairet, S. Piérard, J.-B. Ruffio, M. Samland, J. Stone, M. Van Droogenbroeck

Proceedings Volume 11448, 114485A (2020) https://doi.org/10.1117/12.2574803

KEYWORDS: Exoplanets, Algorithm development, Planets, Stars, Adaptive optics, Coronagraphy, Interference (communication), Detection and tracking algorithms

Read Abstract +

Proceedings Article | 9 August 2018 Paper

Lessons for WFIRST CGI from ground-based high-contrast systems

Vanessa Bailey, Michael Bottom, Eric Cady, Faustine Cantalloube, Jozua de Boer, Tyler Groff, John Krist, Maxwell Millar-Blanchaer, Arthur Vigan, Jeffrey Chilcote, Elodie Choquet, Robert De Rosa, Julien Girard, Olivier Guyon, Brian Kern, Anne-Marie Lagrange, Bruce Macintosh, Jared Males, Christian Marois, Tiffany Meshkat, Julien Milli, Mamadoue N'Diaye, Henry Ngo, Eric Nielsen, Jason Rhodes, Garreth Ruane, Rob van Holstein, Jason Wang, Wenhao Xuan

Proceedings Volume 10698, 106986P (2018) https://doi.org/10.1117/12.2313820

KEYWORDS: Calibration, Stars, Point spread functions, Polarization, Coronagraphy, Satellites, Telescopes, Planets, Polarimetry, Imaging spectroscopy

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years