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28 March 2024
 
  » arxiv » 2108.02310

 Article overview


TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet
Ares Osborn ; David J. Armstrong ; Bryson Cale ; Rafael Brahm ; Robert A. Wittenmyer ; Fei Dai ; Ian J. M. Crossfield ; Edward M. Bryant ; Vardan Adibekyan ; Ryan Cloutier ; Karen A. Collins ; E. Delgado Mena ; Malcolm Fridlund ; Coel Hellier ; Steve B. Howell ; George W. King ; Jorge Lillo-Box ; Jon Otegi ; S. Sousa ; Keivan G. Stassun ; Elisabeth C. Matthews ; Carl Ziegler ; George Ricker ; Roland Vanderspek ; David W. Latham ; S. Seager ; Joshua N. Winn ; Jon M. Jenkins ; Jack S. Acton ; Brett C. Addison ; David R. Anderson ; Sarah Ballard ; David Barrado ; Susana C. C. Barros ; Natalie Batalha ; Daniel Bayliss ; Thomas Barclay ; Björn Benneke ; John Berberian Jr. ; Francois Bouchy ; Brendan P. Bowler ; César Briceño ; Christopher J. Burke ; Matthew R. Burleigh ; Sarah L. Casewell ; David Ciardi ; Kevin I. Collins ; Benjamin F. Cooke ; Olivier D. S. Demangeon ; Rodrigo F. Díaz ; C. Dorn ; Diana Dragomir ; Courtney Dressing ; Xavier Dumusque ; Néstor Espinoza ; P. Figueira ; Benjamin Fulton ; E. Furlan ; E. Gaidos ; C. Geneser ; Samuel Gill ; Michael R. Goad ; Erica J. Gonzales ; Varoujan Gorjian ; Maximilian N. Günther ; Ravit Helled ; Beth A. Henderson ; Thomas Henning ; Aleisha Hogan ; Saeed Hojjatpanah ; Jonathan Horner ; Andrew W. Howard ; Sergio Hoyer ; Dan Huber ; Howard Isaacson ; James S. Jenkins ; Eric L. N. Jensen ; Andrés Jordán ; Stephen R. Kane ; Richard C. Kidwell Jr. ; John Kielkopf ; Nicholas Law ; Monika Lendl ; M. Lund ; Rachel A. Matson ; Andrew W. Mann ; James McCormac ; Matthew W. Mengel ; Farisa Y. Morales ; Louise D. Nielsen ; Jack Okumura ; Hugh P. Osborn ; Erik A. Petigura ; Peter Plavchan ; Don Pollacco ; Elisa V. Quintana ; Liam Raynard ; Paul Robertson ; Mark E. Rose ; Arpita Roy ; Michael Reefe ; Alexandre Santerne ; Nuno C. Santos ; Paula Sarkis ; J. Schlieder ; Richard P. Schwarz ; Nicholas J. Scott ; Avi Shporer ; A. M. S. Smith ; C. Stibbard ; Chris Stockdale ; Paul A. Strøm ; Joseph D. Twicken ; Thiam-Guan Tan ; A. Tanner ; J. Teske ; Rosanna H. Tilbrook ; C. G. Tinney ; Stephane Udry ; Jesus Noel Villaseñor ; Jose I. Vines ; Sharon X. Wang ; Lauren M. Weiss ; Richard G. West ; Peter J. Wheatley ; Duncan J. Wright ; Hui Zhang ; F. Zohrabi ;
Date 5 Aug 2021
AbstractWe present the bright (V$_{mag} = 9.12$), multi-planet system TOI-431, characterised with photometry and radial velocities. We estimate the stellar rotation period to be $30.5 pm 0.7$ days using archival photometry and radial velocities. TOI-431b is a super-Earth with a period of 0.49 days, a radius of 1.28 $pm$ 0.04 R$_{oplus}$, a mass of $3.07 pm 0.35$ M$_{oplus}$, and a density of $8.0 pm 1.0$ g cm$^{-3}$; TOI-431d is a sub-Neptune with a period of 12.46 days, a radius of $3.29 pm 0.09$ R$_{oplus}$, a mass of $9.90^{+1.53}_{-1.49}$ M$_{oplus}$, and a density of $1.36 pm 0.25$ g cm$^{-3}$. We find a third planet, TOI-431c, in the HARPS radial velocity data, but it is not seen to transit in the TESS light curves. It has an $M sin i$ of $2.83^{+0.41}_{-0.34}$ M$_{oplus}$, and a period of 4.85 days. TOI-431d likely has an extended atmosphere and is one of the most well-suited TESS discoveries for atmospheric characterisation, while the super-Earth TOI-431b may be a stripped core. These planets straddle the radius gap, presenting an interesting case-study for atmospheric evolution, and TOI-431b is a prime TESS discovery for the study of rocky planet phase curves.
Source arXiv, 2108.02310
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