Community exoplanet imaging data challenge for Roman CGI and starshade rendezvous

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

doi:10.1117/1.jatis.7.2.021218

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…Direct imaging observations of the system thus far have placed upper limits on the presence of giant planets at large separations from the host star (Pathak et al 2021). Further observations with the Roman Space Telescope will provide valuable additional constraints on possible giant planets present in the system (Turnbull et al 2021).…”

Section: Dynamical Stabilitymentioning

confidence: 99%

Refining the Stellar Parameters of τ Ceti: a Pole-on Solar Analog

Korolik,

Roettenbacher,

Fischer

et al. 2023

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To accurately characterize the planets a star may be hosting, stellar parameters must first be well determined. τ Ceti is a nearby solar analog and often a target for exoplanet searches. Uncertainties in the observed rotational velocities have made constraining τ Ceti’s inclination difficult. For planet candidates from radial velocity (RV) observations, this leads to substantial uncertainties in the planetary masses, as only the minimum mass ( m sin i ) can be constrained with RV. In this paper, we used new long-baseline optical interferometric data from the CHARA Array with the MIRC-X beam combiner and extreme precision spectroscopic data from the Lowell Discovery Telescope with EXPRES to improve constraints on the stellar parameters of τ Ceti. Additional archival data were obtained from a Tennessee State University Automatic Photometric Telescope and the Mount Wilson Observatory HK project. These new and archival data sets led to improved stellar parameter determinations, including a limb-darkened angular diameter of 2.019 ± 0.012 mas and rotation period of 46 ± 4 days. By combining parameters from our data sets, we obtained an estimate for the stellar inclination of 7° ± 7°. This nearly pole-on orientation has implications for the previously reported exoplanets. An analysis of the system dynamics suggests that the planetary architecture described by Feng et al. may not retain long-term stability for low orbital inclinations. Additionally, the inclination of τ Ceti reveals a misalignment between the inclinations of the stellar rotation axis and the previously measured debris disk rotation axis (i disk = 35° ± 10°).

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Section: Dynamical Stabilitymentioning

confidence: 99%

Refining the Stellar Parameters of τ Ceti: a Pole-on Solar Analog

Korolik,

Roettenbacher,

Fischer

et al. 2023

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Starshade Imaging Simulation Toolkit for Exoplanet Reconnaissance

Hildebrandt

Shaklan

Cady

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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Starshade Imaging Simulation Toolkit for Exoplanet Reconnaissance (SISTER) is a versatile tool designed to provide accurate models of the images of exoplanet systems when observed with a starshade positioned to block the light from the host star. SISTER allows one to control a set of observational parameters including: (1) the starshade design, position, orientation, and glint properties; (2) the telescope and optical system pupil, aberrations, bandpass, and throughput including a detector model; (3) the exoplanetary system, including stellar distance and spectral type, parallax and proper motion, planet size, reflection properties, orbital parameters, and exozodiacal dust; and (4) background objects. Additionally, there is a substantial library of built-in plotting software added, but the simulations may be stored on disk and plotted with any other software. We describe SISTER's algorithms, its operational modules, and how it can be used to generate starshade optical simulations with a high degree of fidelity. We include some imaging examples. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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ExoVista: A Suite of Planetary System Models for Exoplanet Studies

Stark

2022

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Studies of future space- and ground-based exoplanet surveys often rely on models of planetary systems to simulate instrument response, estimate scientific yields, perform trade analyses, and study efficient observation strategies. Until now, no planetary system models contained all of the basic physics necessary to enable study with all of the major exoplanet detection methods. Here we introduce a suite of such models generated by a new tool, exoVista. The exoVista tool quickly generates thousands of models of quasi-self-consistent planetary systems around known nearby stars at scattered light wavelengths and efficiently records the position, velocity, spectrum, and physical parameters of all bodies as functions of time. The modeled planetary systems can be used to simulate surveys using the direct imaging, transit, astrometric, and radial velocity techniques, as well as the overlap of these different methods.

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Community exoplanet imaging data challenge for Roman CGI and starshade rendezvous

Cited by 5 publications

References 12 publications

Refining the Stellar Parameters of τ Ceti: a Pole-on Solar Analog

Refining the Stellar Parameters of τ Ceti: a Pole-on Solar Analog

Starshade Imaging Simulation Toolkit for Exoplanet Reconnaissance

ExoVista: A Suite of Planetary System Models for Exoplanet Studies

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