Hawthorn, F, Bayliss, D, Wilson, TG, Bonfanti, A, Adibekyan, V, Alibert, Y, Sousa, SG, Collins, KA, Bryant, EM, Osborn, A, Armstrong, DJ, Abe, L, Acton, JS, Addison, BC, Agabi, K, Alonso, R, Alves, DR, Anglada-Escudé, G, Bárczy, T, Barclay, T, Barrado, D, Barros, SCC, Baumjohann, W, Bendjoya, P, Benz, W, Bieryla, A, Bonfils, X, Bouchy, F, Brandeker, A, Broeg, C, Brown, DJA, Burleigh, MR, Buttu, M, Cabrera, J, Caldwell, DA, Casewell, SL, Charbonneau, D, Charnoz, S, Cloutier, R, Cameron, AC, Collins, KI, Conti, DM, Crouzet, N, Czismadia, S, Davies, MB, Deleuil, M, Delgado-Mena, E, Delrez, L, Demangeon, ODS, Demory, B-O, Dransfield, G, Dumusque, X, Egger, JA, Ehrenreich, D, Eigmüller, P, Erickson, A, Essack, Z, Fortier, A, Fossati, L, Fridlund, M, Günther, MN, Güdel, M, Gandolfi, D, Gillard, H, Gillon, M, Gnilka, C, Goad, MR, Goeke, RF, Guillot, T, Hadjigeorghiou, A, Hellier, C, Henderson, BA, Heng, K, Hooton, MJ, Horne, K, Howell, SB, Hoyer, S, Irwin, JM, Jenkins, JS, Jenkins, JM, Jensen, ELN, Kane, SR, Kendall, A, Kielkopf, JF, Kiss, LL, Lacedelli, G, Laskar, J, Latham, DW, Etangs, ALD, Leleu, A, Lendl, M, Lillo-Box, J, Lovis, C, Mékarnia, D, Massey, B, Masters, T, Maxted, PFL, Nascimbeni, V, Nielsen, LD, O’Brien, SM, Olofsson, G, Osborn, HP, Pagano, I, Pallé, E, Persson, CM, Piotto, G, Plavchan, P, Pollacco, D, Queloz, D, Ragazzoni, R, Rauer, H, Ribas, I, Ricker, G, Ségransan, D, Salmon, S, Santerne, A, Santos, NC, Scandariato, G, Schmider, F-X, Schwarz, RP, Seager, S, Shporer, A, Simon, AE, Smith, AMS, Srdoc, G, Steller, M, Suarez, O, Szabó, GM, Teske, J, Thomas, N, Tilbrook, RH, Triaud, AHMJ, Udry, S, Van Grootel, V, Walton, N, Wang, SX, Wheatley, PJ, Winn, JN, Wittenmyer, RA and Zhang, H (2023) TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf. Monthly Notices of the Royal Astronomical Society, 520 (3). 3649 - 3668. ISSN 0035-8711

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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 (∼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.

Item Type: Article
Additional Information: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society The final version of this article and all relevant information related to it, including copyrights, can be found on the publisher website.
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 07 Mar 2023 12:56
Last Modified: 07 Mar 2023 12:56
URI: https://eprints.keele.ac.uk/id/eprint/11994

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