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

Hawthorn, Faith; Bayliss, Daniel; Wilson, Thomas G; Bonfanti, Andrea; Adibekyan, Vardan; Alibert, Yann; Sousa, Sérgio 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-Escudé, Guillem; Bárczy, Tamas; Barclay, Thomas; Barrado, David; Barros, Susana C C; Baumjohann, Wolfgang; Bendjoya, Philippe; Benz, Willy; Bieryla, Allyson; Bonfils, Xavier; Bouchy, François; Brandeker, Alexis; Broeg, Christopher; Brown, David J A; Burleigh, Matthew R; Buttu, Marco; Cabrera, Juan; Caldwell, Douglas A; Casewell, Sarah L; Charbonneau, David; Charnoz, Sébastian; Cloutier, Ryan; Cameron, Andrew Collier; Collins, Kevin I; Conti, Dennis M; Crouzet, Nicolas; Czismadia, Szilárd; Davies, Melvyn B; Deleuil, Magali; Delgado-Mena, Elisa; Delrez, Laetitia; Demangeon, Olivier D S; Demory, Brice-Olivier; Dransfield, Georgina; Dumusque, Xavier; Egger, Jo; Ehrenreich, David; Eigmüller, Philipp; Erickson...

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


Authors

Faith Hawthorn

Daniel Bayliss

Thomas G Wilson

Andrea Bonfanti

Vardan Adibekyan

Yann Alibert

Sérgio G Sousa

Karen A Collins

Edward M Bryant

Ares Osborn

David J Armstrong

Lyu Abe

Jack S Acton

Brett C Addison

Karim Agabi

Roi Alonso

Douglas R Alves

Guillem Anglada-Escudé

Tamas Bárczy

Thomas Barclay

David Barrado

Susana C C Barros

Wolfgang Baumjohann

Philippe Bendjoya

Willy Benz

Allyson Bieryla

Xavier Bonfils

François Bouchy

Alexis Brandeker

Christopher Broeg

David J A Brown

Matthew R Burleigh

Marco Buttu

Juan Cabrera

Douglas A Caldwell

Sarah L Casewell

David Charbonneau

Sébastian Charnoz

Ryan Cloutier

Andrew Collier Cameron

Kevin I Collins

Dennis M Conti

Nicolas Crouzet

Szilárd Czismadia

Melvyn B Davies

Magali Deleuil

Elisa Delgado-Mena

Laetitia Delrez

Olivier D S Demangeon

Brice-Olivier Demory

Georgina Dransfield

Xavier Dumusque

Jo Egger

David Ehrenreich

Philipp Eigmüller

Anders Erickson

Zahra Essack

Andrea Fortier

Luca Fossati

Malcolm Fridlund

Maximilian N Günther

Manuel Güdel

Davide Gandolfi

Harvey Gillard

Michaël Gillon

Crystal Gnilka

Michael R Goad

Robert F Goeke

Tristan Guillot

Andreas Hadjigeorghiou

Beth A Henderson

Kevin Heng

Matthew J Hooton

Keith Horne

Steve B Howell

Sergio Hoyer

Jonathan M Irwin

James S Jenkins

Jon M Jenkins

Eric L N Jensen

Stephen R Kane

Alicia Kendall

John F Kielkopf

Laszlo L Kiss

Gaia Lacedelli

Jacques Laskar

David W Latham

Alain Lecavalier des Etangs

Adrien Leleu

Monika Lendl

Jorge Lillo-Box

Christophe Lovis

Djamel Mékarnia

Bob Massey

Tamzin Masters

Valerio Nascimbeni

Louise D Nielsen

Göran Olofsson

Hugh P Osborn

Isabella Pagano

Enric Pallé

Carina M Persson

Giampaolo Piotto

Peter Plavchan

Don Pollacco

Didier Queloz

Roberto Ragazzoni

Heike Rauer

Ignasi Ribas

George Ricker

Damien Ségransan

Sébastien Salmon

Alexandre Santerne

Nuno C Santos

Gaetano Scandariato

François-Xavier Schmider

Richard P Schwarz

Sara Seager

Avi Shporer

Attila E Simon

Alexis M S Smith

Gregor Srdoc

Manfred Steller

Olga Suarez

Gyula M Szabó

Johanna Teske

Nicolas Thomas

Rosanna H Tilbrook

Amaury H M J Triaud

Stéphane Udry

Valérie Van Grootel

Nicholas Walton

Sharon X Wang

Peter J Wheatley

Joshua N Winn

Robert A Wittenmyer

Hui Zhang



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-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.

Journal Article Type Article
Acceptance Date Jan 26, 2023
Online Publication Date Feb 9, 2023
Publication Date 2023-04
Publicly Available Date May 30, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 520
Issue 3
Pages 3649 - 3668
DOI https://doi.org/10.1093/mnras/stad306
Keywords techniques: photometrict; radial velocities; planets and satellites: detections; stars: individual: TOI-836 (TIC 440887364, GAIA EDR3 6230733559097425152)
Publisher URL https://academic.oup.com/mnras/article-abstract/520/3/3649/7033445?redirectedFrom=fulltext

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