TOI-1338: TESS' First Transiting Circumbinary Planet

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-MisraCoel Hellier, Courtney Dressing, Daniel C. Fabrycky, Gabor Furesz, Jon M. Jenkins, Stephen R. Kane, Ravi Kopparapu, Vedad Kunovac Hodžić, 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

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


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 o˙ and 0.3 M o˙ 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.

Original languageEnglish (US)
Article number253
JournalAstronomical Journal
Issue number6
StatePublished - Jun 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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