TOI-836 : a super-Earth and mini-Neptune transiting a nearby K-dwarf

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Date
04/2023
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Grant ID
ST/R003203/1
ST/V000861/1
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MCP
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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.
Citation
Hawthorn , F , Bayliss , D , Wilson , T G , Bonfanti , A , Adibekyan , V , Alibert , Y , Sousa , S G , Collins , K A , Bryant , E M , Osborn , A , Armstrong , D J , Abe , L , Acton , J S , Addison , B C , Agabi , K , Alonso , R , Alves , D R , Anglada-Escudé , G , Bárczy , T , Barclay , T , Barrado , D , Barros , S C C , Baumjohann , W , Bendjoya , P , Benz , W , Bieryla , A , Bonfils , X , Bouchy , F , Brandeker , A , Broeg , C , Brown , D J A , Burleigh , M R , Buttu , M , Cabrera , J , Caldwell , D A , Casewell , S L , Charbonneau , D , Charnoz , S , Cloutier , R , Cameron , A C , Collins , K I , Conti , D M , Crouzet , N , Czismadia , S , Davies , M B , Deleuil , M , Delgado-Mena , E , Delrez , L , Demangeon , O D S , Demory , B-O , Dransfield , G , Dumusque , X , Egger , J A , Ehrenreich , D , Eigmüller , P , Erickson , A , Essack , Z , Fortier , A , Fossati , L , Fridlund , M , Günther , M N , Güdel , M , Gandolfi , D , Gillard , H , Gillon , M , Gnilka , C , Goad , M R , Goeke , R F , Guillot , T , Hadjigeorghiou , A , Hellier , C , Henderson , B A , Heng , K , Hooton , M J , Horne , K , Howell , S B , Hoyer , S , Irwin , J M , Jenkins , J S , Jenkins , J M , Jensen , E L N , Kane , S R , Kendall , A , Kielkopf , J F , Kiss , L L , Lacedelli , G , Laskar , J , Latham , D W , Lecavalier Des Etangs , A , Leleu , A , Lendl , M , Lillo-Box , J , Lovis , C , Mékarnia , D , Massey , B , Masters , T , Maxted , P F L , Nascimbeni , V , Nielsen , L D , O’Brien , S M , Olofsson , G , Osborn , H P , Pagano , I , Pallé , E , Persson , C M , Piotto , G , Plavchan , P , Pollacco , D , Queloz , D , Ragazzoni , R , Rauer , H , Ribas , I , Ricker , G , Ségransan , D , Salmon , S , Santerne , A , Santos , N C , Scandariato , G , Schmider , F-X , Schwarz , R P , Seager , S , Shporer , A , Simon , A E , Smith , A M S , Srdoc , G , Steller , M , Suarez , O , Szabó , G M , Teske , J , Thomas , N , Tilbrook , R H , Triaud , A H M J , Udry , S , Van Grootel , V , Walton , N , Wang , S X , Wheatley , P J , Winn , J N , Wittenmyer , R A & Zhang , H 2023 , ' TOI-836 : a super-Earth and mini-Neptune transiting a nearby K-dwarf ' , Monthly Notices of the Royal Astronomical Society , vol. 520 , no. 3 , pp. 3649–3668 . https://doi.org/10.1093/mnras/stad306
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stad306
ISSN
0035-8711
Type
Journal article
Rights
Copyright © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stad306.
Description
Funding: TGW, ACC, and KH acknowledge support from STFC consolidated grant numbers ST/R000824/1 and ST/V000861/1, and UKSA grant ST/R003203/1.
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URI
http://hdl.handle.net/10023/27025

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