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Kostov, VB, Orosz, JA, Feinstein, AD, Welsh, WF, Cukier, W, Haghighipour, N, Quarles, B, Martin, DV, Montet, BT, Torres, G, Triaud, AHMJ, Barclay, T, Boyd, P, Briceno, C, Cameron, AC, Correia, ACM, Gilbert, EA, Gill, S, Gillon, M, Haqq-Misra, J, Hellier, C, Dressing, C, Fabrycky, DC, Furesz, G, Jenkins, J, Kane, SR, Kopparapu, R, Hodzic, VK, Latham, DW, Law, N, Levine, AM, Li, G, Lintott, C, Lissauer, JJ, Mann, AW, Mazeh, T, Mardling, R, Maxted, PFL, Eisner, N, Pepe, F, Pepper, J, Pollacco, D, Quinn, SN, Quintana, EV, Rowe, JF, Ricker, G, Rose, ME, Seager, S, Santerne, A, Segransan, D, Short, DR, Smith, JC, Standing, MR, Tokovinin, A, Trifonov, T, Turner, O, Twicken, JD, Udry, S, Vanderspek, R, Winn, JN, Wolf, ET, Ziegler, C, Ansorge, P, Barnet, F, Bergeron, J, Huten, M, Pappa, G and van der Straeten, T (2020) TOI-1338: TESS' First Transiting Circumbinary Planet. Astronomical Journal, 159 (6). ISSN 0004-6256

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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.

Item Type: Article
Additional Information: This is the final published version (version of record). It was first published online via IOP Publishing at https://iopscience.iop.org/article/10.3847/1538-3881/ab8a48 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: exoplanet astronomy, eclipsing binary stars
Subjects: Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
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Depositing User: Symplectic
Date Deposited: 21 Oct 2020 15:07
Last Modified: 25 Feb 2021 15:19
URI: https://eprints.keele.ac.uk/id/eprint/8818

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