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

  title={TOI-1259Ab – a gas giant planet with 2.7 per cent deep transits and a bound white dwarf companion},
  author={David V. Martin and Kareem El-Badry and Vedad Kunovac Hodvzi'c and Amaury H. M. J. Triaud and Ruth Angus and Jessica Birky and Daniel Foreman-Mackey and Christina Hedges and Benjamin T. Montet and Simon J. Murphy and Alexandre Santerne and Keivan G. Stassun and Alexander P. Stephan and Ji Wang and Paul B Benni and Vadim Krushinsky and Nikita Chazov and Nikolay N. Mishevskiy and Carl A. Ziegler and Abderahmane Soubkiou and Zouhair Benkhaldoun and Douglas A. Caldwell and Karen A. Collins and Christopher E. Henze and Natalia M. Guerrero and Jon M. Jenkins and David W. Latham and Adam Levine and Scot W. McDermott and Susan E. Mullally and George R. Ricker and Sara Seager and Avi Shporer and Andrew M. Vanderburg and Roland K. Vanderspek and Joshua N. Winn},
We present TOI-1259Ab, a 1.0RJup gas giant planet transiting a 0.74R K-dwarf on a 3.48 day 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% 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 = 71m s−1, implying a planet… 


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