TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
Journal article, 2023
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.
planets and satellites: detection
techniques: radial velocities
stars: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152)
techniques: photometric
Author
F. Hawthorn
The University of Warwick
D. Bayliss
The University of Warwick
T.G. Wilson
University of St Andrews
A. Bonfanti
Institut fur Weltraumforschung
V. Adibekyan
University of Porto
Y. Alibert
University of Bern
S. G. Sousa
University of Porto
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
E. Bryant
The University of Warwick
A. Osborn
The University of Warwick
D. J. Armstrong
The University of Warwick
L. Abe
Observatoire de la Cote d'Azur
J.S. Acton
University Of Leicester
Brett C Addison
University of Southern Queensland
Karim Agabi
Observatoire de la Cote d'Azur
R. Alonso
University of La Laguna
Instituto de Astrofísica de Canarias
Douglas R. Alves
University of Chile (UCH)
G. Anglada Escude´
Institute of Space Studies of Catalonia (IEEC)
Institute of Space Sciences (ICE) - CSIC
T. Bárczy
Admatis
Thomas Barclay
NASA Goddard Space Flight Center
University of Maryland
D. Barrado
Centro de Astrobiologia (CAB)
S.C.C. Barros
University of Porto
W. Baumjohann
Institut fur Weltraumforschung
Philippe Bendjoya
Observatoire de la Cote d'Azur
W. Benz
University of Bern
Allyson Bieryla
Harvard-Smithsonian Center for Astrophysics
X. Bonfils
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
François Bouchy
University of Geneva
A. Brandeker
Stockholm University
C. Broeg
University of Bern
David J.A. Brown
The University of Warwick
Matt Burleigh
University Of Leicester
M. Buttu
Programma Nazionale di Ricerche in Antartide (PNRA)
Juan Cabrera
German Aerospace Center (DLR)
D. A. Caldwell
NASA Ames Research Center
Sarah Casewell
University Of Leicester
D. Charbonneau
Harvard-Smithsonian Center for Astrophysics
S. Charnoz
Institut de Physique du Globe de Paris
R. Cloutier
Harvard-Smithsonian Center for Astrophysics
A. Collier Cameron
University of St Andrews
K. I. Collins
George Mason University
D. Conti
American Association of Variable Star Observers
N. Crouzet
European Space Research and Technology Centre (ESA ESTEC)
Szilárd Czismadia
German Aerospace Center (DLR)
M. B. Davies
Lund University
M. Deleuil
Laboratoire d'Astrophysique de Marseille
E. Delgado Mena
University of Porto
L. Delrez
University of Liège
O. Demangeon
University of Porto
B.O. Demory
University of Bern
Georgina Dransfield
University of Birmingham
X. Dumusque
University of Geneva
J. A. Egger
University of Bern
D. Ehrenreich
University of Geneva
P. Eigmüller
German Aerospace Center (DLR)
Anders Erickson
German Aerospace Center (DLR)
Zahra Essack
Massachusetts Institute of Technology (MIT)
A. Fortier
University of Bern
L. Fossati
Institut fur Weltraumforschung
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
Maximilian N. Günther
European Space Research and Technology Centre (ESA ESTEC)
M. Gudel
University of Vienna
D. Gandolfi
University of Turin
Harvey Gillard
The University of Warwick
Michaël Gillon
University of Liège
Crystal Gnilka
NASA Ames Research Center
National Aeronautics and Space Administration (NASA)
M.R. Goad
University Of Leicester
Robert Goeke
Massachusetts Institute of Technology (MIT)
T. Guillot
Observatoire de la Cote d'Azur
A. Hadjigeorghiou
The University of Warwick
Coel Hellier
Keele University
B. Henderson
University Of Leicester
Kevin Heng
The University of Warwick
University of Bern
M.J. Hooton
University of Cambridge
University of Bern
Keith Horne
University of St Andrews
S. B. Howell
NASA Ames Research Center
S. Hoyer
Laboratoire d'Astrophysique de Marseille
J. M. Irwin
Harvard-Smithsonian Center for Astrophysics
James S. Jenkins
Diego Portales University
Centro de Astrofísica y Tecnologías Afines (CATA),
Jon M. Jenkins
NASA Ames Research Center
Eric L.N. Jensen
Swarthmore College
S. R. Kane
University of California
Alicia Kendall
University Of Leicester
J. F. Kielkopf
University of Louisville
L.L. Kiss
Hungarian Academy of Sciences
Eötvös Loránd University (ELTE)
G. Lacedelli
Istituto nazionale di astrofisica (INAF)
J. Laskar
Paris Observatory
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
A. L. des Etangs
Institut d 'Astrophysique de Paris
A. Leleu
University of Geneva
University of Bern
M. Lendl
University of Geneva
J. Lillo-Box
Centro de Astrobiologia (CAB)
C. Lovis
University of Geneva
Djamel Mékarnia
Observatoire de la Cote d'Azur
Bob Massey
Villa’39 Observatory
Tamzin Masters
The University of Warwick
P. Maxted
Keele University
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
L. D. Nielsen
European Southern Observatory (ESO)
Sean M. O’Brien
Queen's University Belfast
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 520 3 3649-3668Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1093/mnras/stad306