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

Martin, David V. and El-Badry, Kareem and Hodzic, Vedad Kunovac and Triaud, Amaury H. M. J. and Angus, Ruth and Birky, Jessica and Foreman-Mackey, Daniel and Hedges, Christina and Montet, Benjamin T. and Murphy, Simon J. and Santerne, Alexandre and Stassun, Keivan G. and Stephan, Alexander P. and Wang, Ji and Benni, Paul and Krushinsky, Vadim and Chazov, Nikita and Mishevskiy, Nikolay and Ziegler, Carl and Soubkiou, Abderahmane and Benkhaldoun, Zouhair and Boisse, Isabelle and Battley, Matthew and Miller, Nicola J. and Caldwell, Douglas A. and Collins, Karen and Henze, Christopher E. and Guerrero, Natalia M. and Jenkins, Jon M. and Latham, David W. and Levine, Adam and McDermott, Scott and Mullally, Susan E. and Ricker, George and Seager, Sara and Shporer, Avi and Vanderburg, Andrew and Vanderspek, Roland and Winn, Joshua N. (2021) TOI-1259Ab – a gas giant planet with 2.7 per cent deep transits and a bound white dwarf companion. Monthly Notices of the Royal Astronomical Society, 507 (3). pp. 4132-4148. ISSN 0035-8711

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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=71ms−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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 13 Jul 2022 23:39
Last Modified: 15 Aug 2022 04:11
Uncontrolled Keywords: planets and satellites: formation; binaries: eclipsing; stars: individual (TOI-1259); stars: low-mass; stars: rotation; Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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