Hawthorn, Faith; Bayliss, Daniel; Wilson, Thomas G.; Bonfanti, Andrea; Adibekyan, Vardan; Alibert, Yann; Sousa, Sergio 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-Escude, Guillem; Barczy, Tamas; Barclay, Thomas; Barrado, David; Barros, Susana C. C.; Baumjohann, Wolfgang; Bendjoya, Philippe; Benz, Willy; Bieryla, Allyson; Bonfils, Xavier; Bouchy, Francois; Brandeker, Alexis; Broeg, Christopher; Brown, David J. A.; Burleigh, Matthew R.; Buttu, Marco; Cabrera, Juan; Caldwell, Douglas A.; Casewell, Sarah L.; Charbonneau, David; Charnoz, Sebastian; Cloutier, Ryan; Cameron, Andrew Collier; Collins, Kevin, I; Conti, Dennis M.; Crouzet, Nicolas; Czismadia, Szilard; 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; Eigmueller, Philipp; Erickson, Anders; Essack, Zahra; Fortier, Andrea; Fossati, Luca; Fridlund, Malcolm; Gunther, Maximilian N.; Guedel, Manuel; Gandolfi, Davide; Gillard, Harvey; Gillon, Michael; 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.; des Etangs, Alain Lecavalier; Leleu, Adrien; Lendl, Monika; Lillo-Box, Jorge; Lovis, Christophe; Mekarnia, Djamel; Massey, Bob; Masters, Tamzin; Maxted, Pierre F. L.; Nascimbeni, Valerio; Nielsen, Louise D.; O'Brien, Sean M.; Olofsson, Goran; Osborn, Hugh P.; Pagano, Isabella; Palle, Enric; Persson, Carina M.; Piotto, Giampaolo; Plavchan, Peter; Pollacco, Don; Queloz, Didier; Ragazzoni, Roberto; Rauer, Heike; Ribas, Ignasi; Ricker, George; Segransan, Damien; Salmon, Sebastien; Santerne, Alexandre; Santos, Nuno C.; Scandariato, Gaetano; Schmider, Francois-Xavier; Schwarz, Richard P.; Seager, Sara; Shporer, Avi; Simon, Attila E.; Smith, Alexis M. S.; Srdoc, Gregor; Steller, Manfred; Suarez, Olga; Szabo, Gyula M.; Teske, Johanna; Thomas, Nicolas; Tilbrook, Rosanna H.; Triaud, Amaury H. M. J.; Udry, Stephane; Van Grootel, Valerie; Walton, Nicholas; Wang, Sharon X.; Wheatley, Peter J.; Winn, Joshua N.; Wittenmyer, Robert A.; Zhang, Hui
2023
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
DOI
10.1093/mnras/stad306
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 (similar to 200 mas yr(-1)), low metallicity ([Fe/H]asymptotic to-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-circle plus 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-circle plus 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-circle plus, while TOI-836 c has a mass of 9.6 +/- 2.6 M-circle plus. 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