TOI-1338: TESS' First Transiting Circumbinary Planet

June 2020 • 2020AJ....159..253K

Authors • Kostov, Veselin B. • Orosz, Jerome A. • Feinstein, Adina D. • Welsh, William F. • Cukier, Wolf • Haghighipour, Nader • Quarles, Billy • Martin, David V. • Montet, Benjamin T. • Torres, Guillermo • Triaud, Amaury H. M. J. • Barclay, Thomas • Boyd, Patricia • Briceno, Cesar • Cameron, Andrew Collier • Correia, Alexandre C. M. • Gilbert, Emily A. • Gill, Samuel • Gillon, Michaël • Haqq-Misra, Jacob • Hellier, Coel • Dressing, Courtney • Fabrycky, Daniel C. • Furesz, Gabor • Jenkins, Jon M. • Kane, Stephen R. • Kopparapu, Ravi • Hodžić, Vedad Kunovac • Latham, David W. • Law, Nicholas • Levine, Alan M. • Li, Gongjie • Lintott, Chris • Lissauer, Jack J. • Mann, Andrew W. • Mazeh, Tsevi • Mardling, Rosemary • Maxted, Pierre F. L. • Eisner, Nora • Pepe, Francesco • Pepper, Joshua • Pollacco, Don • Quinn, Samuel N. • Quintana, Elisa V. • Rowe, Jason F. • Ricker, George • Rose, Mark E. • Seager, S. • Santerne, Alexandre • Ségransan, Damien • Short, Donald R. • Smith, Jeffrey C. • Standing, Matthew R. • Tokovinin, Andrei • Trifonov, Trifon • Turner, Oliver • Twicken, Joseph D. • Udry, Stéphane • Vanderspek, Roland • Winn, Joshua N. • Wolf, Eric T. • Ziegler, Carl • Ansorge, Peter • Barnet, Frank • Bergeron, Joel • Huten, Marc • Pappa, Giuseppe • van der Straeten, Timo

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.

Links

• SIMBAD https://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2020AJ....159..253K
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/ab8a48/pdf
• PREPRINT http://arxiv.org/abs/2004.07783
• DATA http://archive.eso.org/bin/ads2eso?2020AJ....159..253K
• DATA http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?type=REFERENCE&bibcode=2020AJ....159..253K
• DATA https://irsa.ipac.caltech.edu/bibdata/2020/K/2020AJ....159..253K.html
• ELECTR https://doi.org/10.3847/1538-3881/ab8a48