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

2021/01/31 by David V. Martin, Kareem El-Badry, Vedad Kunovac Hodžić +46
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Brown dwarf #Circumbinary planet #Exoplanet #Gas giant #Giant planet #Light curve #Orbit (dynamics) #Physics #Planet #Planetary system #Radial velocity #Stars #Stellar, planetary, and galactic studies #White dwarf #astro-ph.EP #astro-ph.SR

paper · pdf · doi:10.1093/mnras/stab2129

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

openalex created_date 2021/01/18 · arxiv created 2021/07/01 · openalex publication_date 2021/07/25 · arxiv updated 2021/08/04 · openalex updated_date 2026/08/06

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.

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