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, Sérgio G. Sousa, Karen A. Collins, 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-Escudé, Tamas Bárczy, Thomas BarclayDavid Barrado, Susana C. C. Barros, Wolfgang Baumjohann, Philippe Bendjoya, Willy Benz, Allyson Bieryla, Xavier Bonfils, François Bouchy, Alexis Brandeker, Christopher Broeg, Matthew R. Burleigh, Marco Buttu, Juan Cabrera, Douglas A. Caldwell, Sarah L. Casewell, David Charbonneau, Sébastian Charnoz, Ryan Cloutier, Andrew Collier Cameron, Kevin I. Collins, Dennis M. Conti, Nicolas Crouzet, Szilárd 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 Eigmüller, Anders Erickson, Zahra Essack, Andrea Fortier, Luca Fossati, Malcolm Fridlund, Maximilian N. Günther, Manuel Güdel, Davide Gandolfi, Harvey Gillard, Michaël 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 Mékarnia, Bob Massey, Tamzin Masters, Pierre F. L. Maxted, Valerio Nascimbeni, Louise D. Nielsen, Sean M. O'Brien, Göran Olofsson, Hugh P. Osborn, Isabella Pagano, Enric Pallé, Carina M. Persson, Giampaolo Piotto, Peter Plavchan, Don Pollacco, Didier Queloz, Roberto Ragazzoni, Heike Rauer, Ignasi Ribas, George Ricker, Damien Ségransan, Sébastien Salmon, Alexandre Santerne, Nuno C. Santos, Gaetano Scandariato, François-Xavier Schmider, Richard P. Schwarz, Sara Seager, Avi Shporer, Attila E. Simon, Gregor Srdoc, Manfred Steller, Olga Suarez, Gyula M. Szabó, Johanna Teske, Nicolas Thomas, Rosanna H. Tilbrook, Amaury H. M. J. Triaud, Stéphane Udry, Valérie Van Grootel, Nicholas Walton, Sharon X. Wang, Peter J. Wheatley, Joshua N. Winn, Robert A. Wittenmyer, Hui Zhang

Research output: Working paperPreprint

Abstract

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=8.5mag), high proper motion (∼200 mas yr−1), low metallicity ([Fe/H]≈−0.28) K-dwarf with a mass of 0.68±0.05 M⊙ and aradius of 0.67±0.01 R⊙. We obtain photometric follow-upobservations with a variety of facilities, and we use these data-sets todetermine that the inner planet, TOI-836 b, is a 1.70±0.07 R⊕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±0.09 R⊕mini-Neptune in an 8.60 day orbit. Radial velocity measurements reveal thatTOI-836 b has a mass of 4.5±0.9 M⊕ , while TOI-836 c has a massof 9.6±2.6 M⊕. Photometric observations show Transit TimingVariations (TTVs) on the order of 20 minutes for TOI-836 c, although there areno detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused byan undetected exterior planet.
Original languageEnglish
PublisherarXiv
Number of pages21
DOIs
Publication statusPublished - 16 Aug 2022

Keywords

  • Planets and satellites: detection
  • Stars: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152)
  • Techniques: photometric
  • Techniques: radial velocities

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