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, David J A Brown, 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, Alexis M S Smith, 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 = 8.5 mag), 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 a radius of 0.67 ± 0.01 R⊙. 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 ± 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 that TOI-836 b has a mass of 4.5 ± 0.9 M⊕, while TOI-836 c has a mass of 9.6 ± 2.6 M⊕. 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.
Original languageEnglish
Pages (from-to)3649–3668
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume520
Issue number3
Early online date17 Feb 2023
DOIs
Publication statusPublished - 1 Apr 2023

Keywords

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

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