TOI-1338: TESS' First Transiting Circumbinary Planet
Abstract
We report the detection of the first circumbinary planet found by 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 two-minute cadence. It consists of two stars with masses of 1.1 MSun and 0.3 MSun 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 REarth 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 circumbinary planets. 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 degree. 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 circumbinary planets, and provides further understanding of the formation and evolution of planets orbiting close binary stars.
Cite
@article{arxiv.2004.07783,
title = {TOI-1338: TESS' First Transiting Circumbinary Planet},
author = {Veselin B. Kostov and Jerome A. Orosz and Adina D. Feinstein and William F. Welsh and Wolf Cukier and Nader Haghighipour and Billy Quarles and David V. Martin and Benjamin T. Montet and Guillermo Torres and Amaury H. M. J. Triaud and Thomas Barclay and Patricia Boyd and Cesar Briceno and Andrew Collier Cameron and Alexandre C. M. Correia and Emily A. Gilbert and Samuel Gill and Michael Gillon and Jacob Haqq-Misra and Coel Hellier and Courtney Dressing and Daniel C. Fabrycky and Gabor Furesz and Jon Jenkins and Stephen R. Kane and Ravi Kopparapu and Vedad Kunovac Hodzic and David W. Latham and Nicholas Law and Alan M. Levine and Gongjie Li and Chris Lintott and Jack J. Lissauer and Andrew W. Mann and Tsevi Mazeh and Rosemary Mardling and Pierre F. L. Maxted and Nora Eisner and Francesco Pepe and Joshua Pepper and Don Pollacco and Samuel N. Quinn and Elisa V. Quintana and Jason F. Rowe and George Ricker and Mark E. Rose and Sara Seager and Alexandre Santerne and Damien Segransan and Donald R. Short and Jeffrey C. Smith and Matthew R. Standing and Andrei Tokovinin and Trifon Trifonov and Oliver Turner and Joseph D. Twicken and Stephane Udry and Roland Vanderspek and Joshua N. Winn and Eric T. Wolf and Carl Ziegler and Peter Ansorge and Frank Barnet and Joel Bergeron and Marc Huten and Giuseppe Pappa and Timo van der Straeten},
journal= {arXiv preprint arXiv:2004.07783},
year = {2020}
}
Comments
35 pages, 21 figures, 6 tables