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Determining Which Binary Component Hosts the TESS Transiting Planet

Lester, Kathryn V. and Howell, Steve B. and Ciardi, David R. and Matson, Rachel A. (2022) Determining Which Binary Component Hosts the TESS Transiting Planet. Astronomical Journal, 164 (2). Art. No. 56. ISSN 0004-6256. doi:10.3847/1538-3881/ac75ee.

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The NASA TESS mission has discovered many transiting planets orbiting bright nearby stars, and high-resolution imaging studies have revealed that a number of these exoplanet hosts reside in binary or multiple star systems. In such systems, transit observations alone cannot determine which star in the binary system actually hosts the orbiting planet. The knowledge of which star the planet orbits is necessary for determining accurate physical properties for the planet, especially its true radius and mean bulk density. We derived the mean stellar densities for the components of 23 binary systems using the light curve transit shape and the binary flux ratio from speckle imaging, then tested the consistency with stellar models to determine which component is the host star. We found that 70% of the TESS transiting planets in our sample orbit the primary star.

Item Type:Article
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URLURL TypeDescription Paper
Lester, Kathryn V.0000-0002-9903-9911
Howell, Steve B.0000-0002-2532-2853
Ciardi, David R.0000-0002-5741-3047
Matson, Rachel A.0000-0001-7233-7508
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2022 April 15; revised 2022 June 3; accepted 2022 June 3; published 2022 July 18. K.V.L. is supported by an appointment to the NASA Postdoctoral Program at the NASA Ames Research Center, administered by Oak Ridge Associated Universities under contract with NASA. This paper includes data collected with the TESS mission obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555. This work also made use of the Exoplanet Follow-up Observation Program website and EXOFAST (Eastman et al. 2013) tool provided by the NASA Exoplanet Archive, which is operated by the California Institute of Technology under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Facilities: TESS - , SOAR - , Gemini North - , Gemini South - , WIYN. - Software: Astropy (Astropy Collaboration et al. 2013, 2018), celerite (Foreman-Mackey et al. 2017; Foreman-Mackey 2018), EXOFAST (Eastman et al. 2013), Matplotlib (Hunter 2007), NumPy (Harris et al. 2020), SciPy (Virtanen et al. 2020)
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:Exoplanets; High angular resolution; Speckle interferometry
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanets (498); High angular resolution (2167); Speckle interferometry (1552)
Record Number:CaltechAUTHORS:20220727-38296000
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Official Citation:Kathryn V. Lester et al 2022 AJ 164 56
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115913
Deposited By: George Porter
Deposited On:28 Jul 2022 22:41
Last Modified:28 Jul 2022 22:41

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