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arxiv: 2208.07328 · v1 · pith:IOGPV4ZAnew · submitted 2022-08-15 · 🌌 astro-ph.EP

TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf

Faith Hawthorn , Daniel Bayliss , Thomas G. Wilson , Andrea Bonfanti , Vardan Adibekyan , Yann Alibert , S\'ergio G. Sousa , Karen A. Collins
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Edward M. Bryant Ares Osborn David J. Armstrong Lyu Abe Jack S. Acton Brett C. Addison Karim Agabi Roi Alonso Douglas R. Alves Guillem Anglada-Escud\'e Tamas B\'arczy Thomas Barclay David Barrado Susana C. C. Barros Wolfgang Baumjohann Philippe Bendjoya Willy Benz Allyson Bieryla Xavier Bonfils Fran\c{c}ois Bouchy Alexis Brandeker Christopher Broeg David J.A. Brown Matthew R. Burleigh Marco Buttu Juan Cabrera Douglas A. Caldwell Sarah L. Casewell David Charbonneau S\'ebastian Charnoz Ryan Cloutier Andrew Collier Cameron Kevin I. Collins Dennis M. Conti Nicolas Crouzet Szil\'ard Czismadia Melvyn B. Davies Magali Deleuil Elisa Delgado-Mena Laetitia Delrez Olivier D. S. Demangeon Brice-Olivier Demory Georgina Dransfield Xavier Dumusque Jo Ann Egger David Ehrenreich Philipp Eigm\"uller Anders Erickson Zahra Essack Andrea Fortier Luca Fossati Malcolm Fridlund Maximilian N. G\"unther Manuel G\"udel Davide Gandolfi Harvey Gillard Micha\"el Gillon Crystal Gnilka Michael R. Goad Robert F. Goeke Tristan Guillot Andreas Hadjigeorghiou Coel Hellier Beth A. Henderson Kevin Heng Matthew J. Hooton Keith Horne Steve B. Howell Sergio Hoyer Jonathan M. Irwin James S. Jenkins Jon M. Jenkins Eric L. N. Jensen Stephen R. Kane Alicia Kendall John F. Kielkopf Laszlo L. Kiss Gaia Lacedelli Jacques Laskar David W. Latham Alain Lecavalier des Etangs Adrien Leleu Monika Lendl Jorge Lillo-Box Christophe Lovis Djamel M\'ekarnia Bob Massey Tamzin Masters Pierre F. L. Maxted Valerio Nascimbeni Louise D. Nielsen Sean M. O'Brien G\"oran Olofsson Hugh P. Osborn Isabella Pagano Enric Pall\'e Carina M. Persson Giampaolo Piotto Peter Plavchan Don Pollacco Didier Queloz Roberto Ragazzoni Heike Rauer Ignasi Ribas George Ricker Damien S\'egransan S\'ebastien Salmon Alexandre Santerne Nuno C. Santos Gaetano Scandariato Fran\c{c}ois-Xavier Schmider Richard P. Schwarz Sara Seager Avi Shporer Attila E. Simon Alexis M. S. Smith Gregor Srdoc Manfred Steller Olga Suarez Gyula M. Szab\'o Johanna Teske Nicolas Thomas Rosanna H. Tilbrook Amaury H. M. J. Triaud St\'ephane Udry Val\'erie Van Grootel Nicholas Walton Sharon X. Wang Peter J. Wheatley Joshua N. Winn Robert A. Wittenmyer Hui Zhang
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keywords toi-836oplusplanetmassttvsk-dwarfmini-neptuneobservations
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We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with a mass of $0.68\pm0.05$ M$_{\odot}$ and a radius of $0.67\pm0.01$ R$_{\odot}$. We obtain photometric follow-up observations with a variety of facilities, and we use these data-sets to determine that the inner planet, TOI-836 b, is a $1.70\pm0.07$ R$_{\oplus}$ super-Earth in a 3.82 day orbit, placing it directly within the so-called 'radius valley'. The outer planet, TOI-836 c, is a $2.59\pm0.09$ R$_{\oplus}$ mini-Neptune in an 8.60 day orbit. Radial velocity measurements reveal that TOI-836 b has a mass of $4.5\pm0.9$ M$_{\oplus}$ , while TOI-836 c has a mass of $9.6\pm2.6$ M$_{\oplus}$. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 minutes for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.

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