e-Article
TOI-1338: TESS’ First Transiting Circumbinary Planet
Document Type
Report
Author
Veselin B. Kostov; Jerome A. Orosz; Adina D. Feinstein; William F. Welsh; Wolf Cukier; Nader Haghighipour; Billy Quarles; David V. Martin; Benjamin T. Montet; Guillermo Torres; Amaury H. M. J. Triaud; Thomas Barclay; Patricia Boyd; Cesar Briceno; Andrew Collier Cameron; Alexandre C. M. Correia; Emily A Gilbert; Samuel Gill; Michaël Gillon; Jacob Haqq-Misra; Coel Hellier; Courtney Dressing; Daniel C. Fabrycky; Gabor Furesz; Jon M Jenkins; Stephen R. Kane; Ravi Kopparapu; Vedad Kunovac Hodzic; David W. Latham; Nicholas Law; Alan M. Levine; Gongjie Li; Chris Lintott; Jack J. Lissauer; Andrew W. Mann; Tsevi Mazeh; Rosemary Mardling; Pierre F. L. Maxted; Nora Eisner; Francesco Pepe; Joshua Pepper; Don Pollacco; Samuel N. Quinn; Elisa V Quintana; Jason F. Rowe; George Ricker; Mark E Rose; S. Seager; Alexandre Santerne; Damien Ségransan; Donald R. Short; Jeffrey C. Smith; Matthew R. Standing; Andrei Tokovinin; Trifon Trifonov; Oliver Turner; Joseph D. Twicken; Stéphane Udry; Roland Vanderspek; Joshua N. Winn; Eric T. Wolf; Carl Ziegler; Peter Ansorge; Frank Barnet; Joel Bergeron; Marc Huten; Giuseppe Pappa; Timo van der Straeten
Source
The Astronomical Journal. 159(6)
Subject
Language
English
ISSN
1538-3881
0004-6256
0004-6256
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 1.1M(ʘ) and 0.3M(ʘ) on a slightly eccentric (0.16), 14.6 day orbit, producing prominent primary eclipses and shallow secondary eclipses. The planet has a radius of ∼6.9R(⊕) 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 radialvelocity 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.