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TOI-1338: TESS' First Transiting Circumbinary Planet

Abstract : We report the detection of the first circumbinary planet (CBP) found by Transiting Exoplanet Survey Satellite (TESS). The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30 minute cadence and in sectors 4 through 12 at 2 minute cadence. It consists of two stars with masses of 1.1 M and 0.3 M on a slightly eccentric (0.16), 14.6 day orbit, producing prominent primary eclipses and shallow secondary eclipses. The planet has a radius of ∼6.9 R and was observed to make three transits across the primary star of roughly equal depths (∼0.2%) but different durations—a common signature of transiting CBPs. Its orbit is nearly circular (e ≍ 0.09) with an orbital period of 95.2 days. The orbital planes of the binary and the planet are aligned to within ∼1°. To obtain a complete solution for the system, we combined the TESS photometry with existing ground-based radial-velocity observations in a numerical photometric-dynamical model. The system demonstrates the discovery potential of TESS for CBPs and provides further understanding of the formation and evolution of planets orbiting close binary stars.
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https://hal-insu.archives-ouvertes.fr/insu-03667098
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Submitted on : Friday, May 13, 2022 - 10:02:46 AM
Last modification on : Saturday, June 25, 2022 - 3:17:10 AM

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Veselin B. Kostov, Jerome A. Orosz, Adina D. Feinstein, William F. Welsh, Wolf Cukier, et al.. TOI-1338: TESS' First Transiting Circumbinary Planet. The Astronomical Journal, 2020, 159, ⟨10.3847/1538-3881/ab8a48⟩. ⟨insu-03667098⟩

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