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TOI-1338: TESS' First Transiting Circumbinary Planet

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; Collier Cameron, Andrew; 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; Kunovac Hodžić, Vedad; 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, Oli...

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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

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

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


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.


Kostov, V. B., Orosz, J. A., Feinstein, A. D., Welsh, W. F., Cukier, W., Haghighipour, N., …van der Straeten, T. (2020). TOI-1338: TESS' First Transiting Circumbinary Planet. Astronomical Journal, 159(6),

Journal Article Type Article
Acceptance Date Apr 15, 2020
Publication Date May 7, 2020
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 159
Issue 6
Keywords exoplanet astronomy, eclipsing binary stars
Publisher URL


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