TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet

  title={TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet},
  author={Ares Osborn and David J Armstrong and Bryson L. Cale and Rafael Brahm and Robert A. Wittenmyer and Fei Dai and Ian J. M. Crossfield and Edward M. Bryant and Vardan Adibekyan and Ryan Cloutier and Karen A. Collins and Elisa Delgado Mena and Malcolm Fridlund and Coel Hellier and Steve B. Howell and George W King and Jorge Lillo-Box and J. F. Otegi and S{\'e}rgio G. Sousa and Keivan G. Stassun and Elisabeth C. Matthews and Carl A. Ziegler and George R. Ricker and Roland K. Vanderspek and David W. Latham and Sara Seager and Joshua N. Winn and Jon M. Jenkins and Jack S Acton and Brett C. Addison and David R. Anderson and Sarah Ballard and David Barrado and Susana C. C. Barros and Natalie M. Batalha and Daniel Bayliss and Thomas Barclay and Bj{\"o}rn Benneke and J. Berberian and François Bouchy and Brendan P. Bowler and C{\'e}sar Brice{\~n}o and Christopher J. Burke and Matthew R. Burleigh and Sarah L. Casewell and David R. Ciardi and Kevin I. Collins and Benjamin F Cooke and Olivier D. S. Demangeon and Rodrigo F. D'iaz and Caroline Dorn and Diana Dragomir and Courtney D. Dressing and Xavier Dumusque and N{\'e}stor Espinoza and Pedro Figueira and Benjamin J. Fulton and Elise Furlan and Eric Gaidos and Claire S. Geneser and Samuel Gill and M. R. Goad and Erica J. Gonzales and Varoujan Gorjian and Maximilian N. Gunther and Ravit Helled and Beth A. Henderson and Th. Henning and Aleisha Hogan and S. Hojjatpanah and Jonathan Horner and Andrew W. Howard and Sergio Hoyer and Daniel Huber and Howard T. Isaacson and James S. Jenkins and Eric L. N. Jensen and Andr'es Jord'an and Stephen R. Kane and Richard C. Kidwell and John F. Kielkopf and Nicholas M. Law and Monika Lendl and Michael B. Lund and Rachel A. Matson and Andrew W. Mann and J. McCormac and Matthew W. Mengel and Farisa Y. Morales and Louise D. Nielsen and Jack Okumura and H. P. Osborn and Erik A. Petigura and Peter P. Plavchan and Don Pollacco and Elisa V. Quintana and Liam Raynard and Paul Robertson and Mark E. Rose and Arpita Roy and Michael A. Reefe and Alexandre Santerne and Nuno C. Santos and Paula Sarkis and Joshua E. Schlieder and Richard P. Schwarz and Nicholas J. Scott and Avi Shporer and A M S Smith and C. Stibbard and Christopher Stockdale and Paul A. Str{\o}m and Joseph D. Twicken and T. G. Tan and Angelle M. Tanner and Johanna K. Teske and Rosanna H. Tilbrook and Christopher G. Tinney and St{\'e}phane Udry and Jesus Noel Samonte Villasenor and Jos{\'e} I Vines and Sharon Xuesong Wang and Lauren M. Weiss and Richard G. West and Peter J. Wheatley and Duncan J. Wright and Hui Zhang and Farzaneh Zohrabi},
  journal={Monthly Notices of the Royal Astronomical Society},
We present the bright (Vmag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 ± 0.7 d using archival photometry and RVs. Transiting Exoplanet Survey Satellite (TESS) objects of Interest (TOI)-431 b is a super-Earth with a period of 0.49 d, a radius of 1.28 ± 0.04 R⊕, a mass of 3.07 ± 0.35 M⊕, and a density of 8.0 ± 1.0 g cm−3; TOI-431 d is a sub-Neptune with a period of 12.46 d, a radius of 3.29… 

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