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 3649-3668

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1093/mnras/stad306

More information

Latest update

7/3/2024 1