Bibcode
Hawthorn, Faith; Bayliss, Daniel; Wilson, Thomas G.; Bonfanti, Andrea; Adibekyan, Vardan; Alibert, Yann; Sousa, Sérgio G.; Collins, Karen A.; Bryant, Edward M.; Osborn, Ares; Armstrong, David J.; Abe, Lyu; Acton, Jack S.; Addison, Brett C.; Agabi, Karim; Alonso, Roi; Alves, Douglas R.; Anglada-Escudé, Guillem; Bárczy, Tamas; Barclay, Thomas; Barrado, David; Barros, Susana C. C.; Baumjohann, Wolfgang; Bendjoya, Philippe; Benz, Willy; Bieryla, Allyson; Bonfils, Xavier; Bouchy, François; Brandeker, Alexis; Broeg, Christopher; Brown, David J. A.; Burleigh, Matthew R.; Buttu, Marco; Cabrera, Juan; Caldwell, Douglas A.; Casewell, Sarah L.; Charbonneau, David; Charnoz, Sébastian; Cloutier, Ryan; Cameron, Andrew Collier; Collins, Kevin I.; Conti, Dennis M.; Crouzet, Nicolas; Czismadia, Szilárd; Davies, Melvyn B.; Deleuil, Magali; Delgado-Mena, Elisa; Delrez, Laetitia; Demangeon, Olivier D. S.; Demory, Brice-Olivier; Dransfield, Georgina; Dumusque, Xavier; Egger, Jo Ann; Ehrenreich, David; Eigmüller, Philipp; Erickson, Anders; Essack, Zahra; Fortier, Andrea; Fossati, Luca; Fridlund, Malcolm; Günther, Maximilian N.; Güdel, Manuel; Gandolfi, Davide; Gillard, Harvey; Gillon, Michaël; Gnilka, Crystal; Goad, Michael R.; Goeke, Robert F.; Guillot, Tristan; Hadjigeorghiou, Andreas; Hellier, Coel; Henderson, Beth A.; Heng, Kevin; Hooton, Matthew J.; Horne, Keith; Howell, Steve B.; Hoyer, Sergio; Irwin, Jonathan M.; Jenkins, James S.; Jenkins, Jon M.; Jensen, Eric L. N.; Kane, Stephen R.; Kendall, Alicia; Kielkopf, John F.; Kiss, Laszlo L.; Lacedelli, Gaia; Laskar, Jacques; Latham, David W.; Etangs, Alain Lecavalier des; Leleu, Adrien; Lendl, Monika; Lillo-Box, Jorge; Lovis, Christophe; Mékarnia, Djamel; Massey, Bob; Masters, Tamzin; Maxted, Pierre F. L.; Nascimbeni, Valerio; Nielsen, Louise D.; O'Brien, Sean M. et al.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society
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4
2023
Citations
8
Refereed citations
4
Description
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-d 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-d 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 min 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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