TOI-1259Ab – a gas giant planet with 2.7 per cent deep transits and a bound white dwarf companion

Author:

Martin David V1ORCID,El-Badry Kareem2ORCID,Hodžić Vedad Kunovac3,Triaud Amaury H M J3ORCID,Angus Ruth45,Birky Jessica6,Foreman-Mackey Daniel5,Hedges Christina78,Montet Benjamin T9,Murphy Simon J10ORCID,Santerne Alexandre11ORCID,Stassun Keivan G12ORCID,Stephan Alexander P113,Wang Ji1,Benni Paul14ORCID,Krushinsky Vadim15ORCID,Chazov Nikita16ORCID,Mishevskiy Nikolay17,Ziegler Carl18ORCID,Soubkiou Abderahmane19,Benkhaldoun Zouhair19ORCID,Boisse Isabelle11,Battley Matthew2021ORCID,Miller Nicola J21ORCID,Caldwell Douglas A822,Collins Karen22,Henze Christopher E8,Guerrero Natalia M23,Jenkins Jon M8,Latham David W24,Levine Adam23,McDermott Scott25,Mullally Susan E26,Ricker George23,Seager Sara232728,Shporer Avi23,Vanderburg Andrew29,Vanderspek Roland23,Winn Joshua N30

Affiliation:

1. Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA

2. Department of Astronomy and Theoretical Astrophysics Center, University of California Berkley, Berkley, CA 94720, USA

3. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

4. American Museum of National History, New York, NY 10024, USA

5. Center for Computational Astrophysics, Flatiron Institute, New York, NY 10010, USA

6. Department of Astronomy, University of Washington, Seattle, WA 98105, USA

7. Bay Area Environmental Research Institute, PO Box 25, Moffett Field, CA, USA

8. NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA

9. School of Physics, University of New South Wales, Sydney, NSW 2052, Australia

10. Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia

11. CNRS, CNES, LAM, Aix Marseille Univ, Marseille, 13388, France

12. Department of Physics & Astronomy, Vanderbilt University, Nashville, TN 37235, USA

13. Center for Cosmology and AstroParticle Physics, The Ohio State University, Columbus, OH 43210, USA

14. Acton Sky Portal Private Observatory, Acton, MA 01720, USA

15. Laboratory of Astrochemical Research, Ural Federal University, Ekaterinburg, Russia, ul. Mira d. 19, Yekaterinburg 620002, Russia

16. Astronomical department, Ural Federal University, Yekaterinburg 620002, Russia

17. Private Astronomical Observatory, Ananjev, Odessa Region UA-66400, Ukraine

18. Department of Physics, Engineering and Astronomy, Stephen F. Austin State University, TX 75962, USA

19. Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, 644M+C9G, Oukaimeden, Morocco

20. Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK

21. Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK

22. SETI Institute, 189 Bernardo Ave, Suite 200, Mountain View, CA 94043, USA

23. Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

24. Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA

25. Proto-Logic LLC, 1718 Euclid Street NW, Washington, DC 20009, USA

26. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

27. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

28. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

29. Department of Astronomy, The University of Wisconsin-Madison, Madison, WI 53706, USA

30. Department of Astrophysical Sciences, 4 Ivy Lane, Princeton University, Princeton, NJ 08544, USA

Abstract

ABSTRACT We present TOI-1259Ab, a 1.0RJup gas giant planet transiting a 0.71R⊙ K-dwarf on a 3.48 d orbit. The system also contains a bound white dwarf companion TOI-1259B with a projected distance of ∼1600 au from the planet host. Transits are observed in nine TESS sectors and are 2.7 per cent deep – among the deepest known – making TOI-1259Ab a promising target for atmospheric characterization. Our follow-up radial velocity measurements indicate a variability of semiamplitude $K=71\, \rm m\, s^{-1}$, implying a planet mass of 0.44MJup. By fitting the spectral energy distribution of the white dwarf, we derive a total age of $4.08^{+1.21}_{-0.53}$ Gyr for the system. The K dwarf’s light curve reveals rotational variability with a period of 28 d, which implies a gyrochronology age broadly consistent with the white dwarf’s total age.

Funder

NASA

Swiss National Science Foundation

European Research Council

Australian Research Council

Ministry of Science and Higher Education of the Russian Federation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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