TOI-1338: TESS’ First Transiting Circumbinary Planet

Journal Article · Mon Jun 01 00:00:00 EDT 2020 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.3847/1538-3881/AB8A48· OSTI ID:23013223

Kostov, Veselin B.; Barclay, Thomas; Boyd, Patricia; Gilbert, Emily A. ^[1]; Orosz, Jerome A.; Welsh, William F. ^[2]; Feinstein, Adina D.; Martin, David V.; Montet, Benjamin T. ^[3]; Cukier, Wolf ^[4]; Haghighipour, Nader ^[5]; Quarles, Billy ^[6]; Torres, Guillermo ^[7]; Briceno, Cesar ^[8]; Cameron, Andrew Collier ^[9]; Correia, Alexandre C. M. ^[10]; Gill, Samuel ^[11]; Gillon, Michaël ^[12]; Haqq-Misra, Jacob ^[13]; others, and

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1. NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States)
2. Department of Astronomy, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182 (United States)
3. Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60637 (United States)
4. Scarsdale High School, 1057 Post Road, Scarsdale, NY 10583 (United States)
5. Institute for Astronomy, University of Hawaii-Manoa, Honolulu, HI 96822 (United States)
6. Center for Relativistic Astrophysics, School of Physics, Georgia Institute of Technology, Atlanta, GA 30332 (United States)
7. Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138 (United States)
8. Cerro Tololo Inter-American Observatory, CTIO/AURA Inc., Casilla 603, La Serena (Chile)
9. Centre for Exoplanet Science, SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS (United Kingdom)
10. CFisUC, Department of Physics, University of Coimbra, 3004-516 Coimbra (Portugal)
11. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL (United Kingdom)
12. Astrobiology Research Unit, Université de Liège, 19C Allée du 6 Août, B-4000 Liège (Belgium)
13. Blue Marble Space Institute of Science, Seattle, Washington (United States)

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 {sub ⊙} and 0.3 M {sub ⊙} 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 {sub ⊕} 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.

• OSTI ID: 23013223
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 159, Issue 6; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BINARY STARS
DETECTION
ECLIPSE
MASS
ORBITS
PHOTOMETRY
PLANETS
RADIAL VELOCITY