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

David V. Martin, Kareem El-Badry, Vedad Kunovac Hodžić, Amaury H. M. J. Triaud, Ruth Angus, Jessica Birky, Daniel Foreman-Mackey, Christina Hedges, Benjamin T. Montet, Simon J. Murphy, Alexandre Santerne, Keivan G. Stassun, Alexander P. Stephan, Ji Wang, Paul Benni, Vadim Krushinsky, Nikita Chazov, Nikolay Mishevskiy, Carl Ziegler, Abderahmane SoubkiouZouhair Benkhaldoun, Douglas A. Caldwell, Karen Collins, Christopher E. Henze, Natalia M. Guerrero, Jon M. Jenkins, David W. Latham, Adam Levine, Scott McDermott, Susan E. Mullally, George Ricker, Sara Seager, Avi Shporer, Andrew Vanderburg, Roland Vanderspek, Joshua N. Winn

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We present TOI-1259Ab, a 1.0 Rjup gas giant planet transiting a 0.71 R K-dwarf on a 3.48 day orbit. The system also contains a bound white dwarf companion TOI-1259B with a projected distance of approximately 1600 AU from the planet host. Transits are observed in nine TESS sector 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 ms-1, implying a planet mass of 0.44 Mjup. 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 a rotational variability with a period of 28 days, which implies a gyrochronology age broadly consistent with the white dwarf's total age.
Original languageEnglish
Pages (from-to)4132-4148
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date27 Jul 2021
Publication statusE-pub ahead of print - 27 Jul 2021

Bibliographical note

Final Version of Record not yet available as of 04/08/2021.

Accepted to MNRAS. Some structural changes from first arXiv version but no significant changes to results. One figure got a bit prettier


  • astro-ph.EP
  • astro-ph.SR


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