TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data
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2105.08614.pdf
Description
Accepted version
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7.11 MB
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Checksum (MD5)
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Author(s)
Seager, Sara
Date Issued
2021
Journal
Astronomical Journal
Publisher
American Astronomical Society
Citation
Seager, Sara. 2021. "TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data." Astronomical Journal, 162 (6).
Version
Author's final manuscript
Abstract
We report the first discovery of a transiting circumbinary planet detected from a single sector of Transiting Exoplanet Survey Satellite (TESS) data. During Sector 21, the planet TIC 172900988b transited the primary star and then five days later it transited the secondary star. The binary is itself eclipsing, with a period P ≈ 19.7 days and an eccentricity e ≈ 0.45. Archival data from ASAS-SN, Evryscope, KELT, and SuperWASP reveal a prominent apsidal motion of the binary orbit, caused by the dynamical interactions between the binary and the planet. A comprehensive photodynamical analysis of the TESS, archival and follow-up data yields stellar masses and radii of M1 = 1.2384 ±0.0007 M⊙ and R1 = 1.3827 ± 0.0016 R⊙ for the primary and M2 = 1.2019 ± 0.0007 M⊙ and R2 = 1.3124 ±0.0012 R⊙ for the secondary. The radius of the planet is R3 = 11.25 ± 0.44 R⊕ (1.004 ± 0.039RJup). The planet's mass and orbital properties are not uniquely determined—there are six solutions with nearly equal likelihood. Specifically, we find that the planet's mass is in the range of 824 ≲ M3 ≲ 981 M⊕ (2.65 ≲ M3 ≲ 3.09MJup), its orbital period could be 188.8, 190.4, 194.0, 199.0, 200.4, or 204.1 days, and the eccentricity is between 0.02 and 0.09. At V = 10.141 mag, the system is accessible for high-resolution spectroscopic observations, e.g., the Rossiter–McLaughlin effect and transit spectroscopy.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.3847/1538-3881/AC223A
