A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS

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Thomas Wilson
Elisa Goffo
  • Function : Author
Yann Alibert
  • Function : Author
Davide Gandolfi
Andrea Bonfanti
  • Function : Author
Carina Persson
  • Function : Author
Andrew Collier Cameron
Malcolm Fridlund
Luca Fossati
  • Function : Author
Judith Korth
Willy Benz
  • Function : Author
Adrien Deline
  • Function : Author
Hans-Gustav Florén
  • Function : Author
Pascal Guterman
  • Function : Author
Vardan Adibekyan
  • Function : Author
Matthew Hooton
Sergio Hoyer
Adrien Leleu
  • Function : Author
Alexander James Mustill
Sébastien Salmon
  • Function : Author
Sérgio Sousa
Olga Suarez
  • Function : Author
Lyu Abe
  • Function : Author
Abdelkrim Agabi
  • Function : Author
Roi Alonso
  • Function : Author
Guillem Anglada
  • Function : Author
Joel Asquier
  • Function : Author
Tamas Bárczy
  • Function : Author
David Barrado Navascues
  • Function : Author
Susana Barros
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Wolfgang Baumjohann
Mathias Beck
  • Function : Author
Thomas Beck
  • Function : Author
Nicolas Billot
  • Function : Author
Xavier Bonfils
  • Function : Author
Alexis Brandeker
  • Function : Author
Christopher Broeg
  • Function : Author
Edward Bryant
Matthew Burleigh
  • Function : Author
Marco Buttu
  • Function : Author
Juan Cabrera
  • Function : Author
Sébastien Charnoz
  • Function : Author
David Ciardi
  • Function : Author
Ryan Cloutier
William Cochran
  • Function : Author
Karen Collins
Knicole Colón
  • Function : Author
Nicolas Crouzet
  • Function : Author
Szilard Csizmadia
Melvyn Davies
  • Function : Author
Magali Deleuil
  • Function : Author
Laetitia Delrez
Olivier Demangeon
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Brice-Olivier Demory
  • Function : Author
Diana Dragomir
  • Function : Author
Georgina Dransfield
  • Function : Author
David Ehrenreich
  • Function : Author
Anders Erikson
  • Function : Author
Andrea Fortier
  • Function : Author
Tianjun Gan
  • Function : Author
Samuel Gill
  • Function : Author
Michaël Gillon
  • Function : Author
Crystal Gnilka
  • Function : Author
Nolan Grieves
  • Function : Author
Sascha Grziwa
  • Function : Author
Manuel Güdel
  • Function : Author
Tristan Guillot
  • Function : Author
Jonas Haldemann
Kevin Heng
  • Function : Author
Keith Horne
  • Function : Author
Steve Howell
  • Function : Author
Kate Isaak
  • Function : Author
Jon Jenkins
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Eric Jensen
Laszlo Kiss
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Gaia Lacedelli
Kristine Lam
  • Function : Author
Jacques Laskar
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David Latham
  • Function : Author
Alain Lecavelier Des Etangs
  • Function : Author
Monika Lendl
Kathryn Lester
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Alan Levine
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John Livingston
Christophe Lovis
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Rafael Luque
Demetrio Magrin
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Wenceslas Marie-Sainte
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Pierre Maxted
Andrew Mayo
Brian Mclean
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Marko Mecina
  • Function : Author
Djamel Mékarnia
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Valerio Nascimbeni
Louise Nielsen
Göran Olofsson
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Hugh Osborn
  • Function : Author
Hannah Osborne
Roland Ottensamer
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Isabella Pagano
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Enric Pallé
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Gisbert Peter
  • Function : Author
Giampaolo Piotto
  • Function : Author
Don Pollacco
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Didier Queloz
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Roberto Ragazzoni
  • Function : Author
Nicola Rando
  • Function : Author
Heike Rauer
  • Function : Author
Seth Redfield
Ignasi Ribas
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George Ricker
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Martin Rieder
  • Function : Author
Nuno Santos
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Gaetano Scandariato
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François-Xavier Schmider
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Richard Schwarz
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Nicholas Scott
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Sara Seager
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Damien Ségransan
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Luisa Maria Serrano
Attila Simon
  • Function : Author
Alexis Smith
  • Function : Author
Manfred Steller
  • Function : Author
Chris Stockdale
  • Function : Author
Gyula Szabó
Nicolas Thomas
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Eric Ting
  • Function : Author
Amaury Triaud
Stéphane Udry
  • Function : Author
Vincent van Eylen
Valérie van Grootel
  • Function : Author
Roland Vanderspek
  • Function : Author
Valentina Viotto
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Nicholas Walton
  • Function : Author
Joshua Winn
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Abstract

We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed and retrieved the CHaracterising ExOPlanets Satellite (CHEOPS), TESS, and ground-based photometry, the High Accuracy Radial velocity Planet Searcher (HARPS) high-resolution spectroscopy, and Gemini speckle imaging. We characterize the host star and determine $T_{\rm eff, \star }=4734\pm 67\,\mathrm{ K}$, $R_{\star }=0.726\pm 0.007\, \mathrm{ R}_{\odot }$, and $M_{\star }=0.748\pm 0.032\, \mathrm{ M}_{\odot }$. We present a novel detrending method based on point spread function shape-change modelling and demonstrate its suitability to correct flux variations in CHEOPS data. We confirm the planetary nature of both bodies and find that TOI-1064 b has an orbital period of Pb = 6.44387 ± 0.00003 d, a radius of Rb = 2.59 ± 0.04 R, and a mass of $M_{\rm b} = 13.5_{-1.8}^{+1.7}$ M, whilst TOI-1064 c has an orbital period of $P_{\rm c} = 12.22657^{+0.00005}_{-0.00004}$ d, a radius of Rc = 2.65 ± 0.04 R, and a 3σ upper mass limit of 8.5 M. From the high-precision photometry we obtain radius uncertainties of ~1.6 per cent, allowing us to conduct internal structure and atmospheric escape modelling. TOI-1064 b is one of the densest, well-characterized sub-Neptunes, with a tenuous atmosphere that can be explained by the loss of a primordial envelope following migration through the protoplanetary disc. It is likely that TOI-1064 c has an extended atmosphere due to the tentative low density, however further radial velocities are needed to confirm this scenario and the similar radii, different masses nature of this system. The high-precision data and modelling of TOI-1064 b are important for planets in this region of mass-radius space, and it allow us to identify a trend in bulk density-stellar metallicity for massive sub-Neptunes that may hint at the formation of this population of planets.

Dates and versions

insu-03643027 , version 1 (15-04-2022)

Identifiers

Cite

Thomas Wilson, Elisa Goffo, Yann Alibert, Davide Gandolfi, Andrea Bonfanti, et al.. A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS. Monthly Notices of the Royal Astronomical Society, 2022, 511, pp.1043-1071. ⟨10.1093/mnras/stab3799⟩. ⟨insu-03643027⟩
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