A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS
Journal article, 2022

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-eff,T-* = 4734 +/- 67 K, R-* = 0.726 +/- 0.007 R-circle dot, and M-* = 0.748 +/- 0.032 M-circle dot. 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 P-b = 6.44387 +/- 0.00003 d, a radius of R-b = 2.59 +/- 0.04 R-circle plus, and a mass of M-b = 13.5(-1.8)(+1.7) M-circle plus, whilst TOI-1064 c has an orbital period of P-c = 12.22657(-0.0)(0004)(+0.00005) d, a radius of R-c = 2.65 +/- 0.04 R-circle plus, and a 3 sigma upper mass limit of 8.5 M-circle plus. From the high-precision photometry we obtain radius uncertainties of similar to 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.

planets and satellites: interiors

techniques: photometric

techniques: radial velocities

planets and satellites: composition

planets and satellites: detection

stars: individual: TOI-1064 (TIC 79748331, Gaia EDR3 6683371847364921088)

Author

T.G. Wilson

University of St Andrews

Elisa Goffo

Thüringer Landessternwarte Tautenburg

University of Turin

Yann Alibert

University of Bern

D. Gandolfi

University of Turin

Andrea Bonfanti

Austrian Academy of Sciences

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

A. Collier Cameron

University of St Andrews

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Leiden University

Luca Fossati

Austrian Academy of Sciences

Judith Korth

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Willy Benz

University of Bern

Adrien Deline

University of Geneva

Hans-Gustav Floren

Stockholm University

Pascal Guterman

Institut National des Sciences de l'Univers

Aix Marseille University

Vardan Adibekyan

University of Porto

Matthew J. Hooton

University of Bern

Sergio Hoyer

Laboratoire d'Astrophysique de Marseille

Adrien Leleu

University of Geneva

University of Bern

Alexander James Mustill

Lund University

Sebastien Salmon

University of Geneva

Sergio G. Sousa

University of Porto

Olga Suarez

Observatoire de la Cote d'Azur

Lyu Abe

Observatoire de la Cote d'Azur

Abdelkrim Agabi

Observatoire de la Cote d'Azur

Roi Alonso

University of La Laguna

Instituto de Astrofísica de Canarias

Guillem Anglada

Spanish National Research Council (CSIC)

Institute of Space Studies of Catalonia (IEEC)

Joel Asquier

European Space Research and Technology Centre (ESA ESTEC)

Tamas Barczy

Admatis

David Barrado Navascues

Spanish Astrobiology Center (INTA-CSIC)

Susana C. C. Barros

University of Porto

Wolfgang Baumjohann

Austrian Academy of Sciences

Mathias Beck

University of Geneva

Thomas Beck

University of Bern

Nicolas Billot

University of Geneva

Xavier Bonfils

Grenoble Alpes University

Alexis Brandeker

Stockholm University

Christopher Broeg

University of Bern

Edward M. Bryant

The University of Warwick

Matthew R. Burleigh

University Of Leicester

J. Cabrera

German Aerospace Center (DLR)

Sebastien Charnoz

Paris Descartes University

David R. Ciardi

California Institute of Technology (Caltech)

Ryan Cloutier

Harvard-Smithsonian Center for Astrophysics

William D. Cochran

The University of Texas at Austin

Karen A. Collins

Harvard-Smithsonian Center for Astrophysics

Knicole D. Colon

NASA Goddard Space Flight Center

Nicolas Crouzet

European Space Research and Technology Centre (ESA ESTEC)

Szilard Csizmadia

German Aerospace Center (DLR)

Melvyn B. Davies

Lund University

Magali Deleuil

Aix Marseille University

Laetitia Delrez

University of Liège

Olivier Demangeon

University of Porto

Brice-Olivier Demory

University of Bern

Diana Dragomir

University of New Mexico

Georgina Dransfield

University of Birmingham

David Ehrenreich

University of Geneva

Anders Erikson

German Aerospace Center (DLR)

Andrea Fortier

University of Bern

Tianjun Gan

Tsinghua University

Samuel Gill

The University of Warwick

Michael Gillon

University of Liège

Crystal L. Gnilka

NASA Ames Research Center

Nolan Grieves

University of Geneva

Sascha Grziwa

University of Cologne

Manuel Gudel

University of Vienna

Tristan Guillot

Observatoire de la Cote d'Azur

Jonas Haldemann

University of Bern

Kevin Heng

University of Bern

The University of Warwick

Keith Horne

University of St Andrews

Steve B. Howell

NASA Ames Research Center

Kate G. Isaak

European Space Research and Technology Centre (ESA ESTEC)

Jon M. Jenkins

NASA Ames Research Center

Eric L. N. Jensen

Swarthmore College

Laszlo Kiss

Hungarian Academy of Sciences

Gaia Lacedelli

University of Padua

Istituto nazionale di astrofisica (INAF)

Kristine Lam

German Aerospace Center (DLR)

Jacques Laskar

Sorbonne University

David W. Latham

Harvard-Smithsonian Center for Astrophysics

Alain Lecavelier des Etangs

Sorbonne University

Monika Lendl

University of Geneva

Lester

NASA Ames Research Center

Alan M. Levine

Massachusetts Institute of Technology (MIT)

John Livingston

University of Tokyo

Christophe Lovis

University of Geneva

Rafael Luque

Institute of Astrophysics of Andalusia (IAA)

Demetrio Magrin

Istituto nazionale di astrofisica (INAF)

Pierre F. L. Maxted

Keele University

Andrew W. Mayo

University of California

Brian McLean

Space Telescope Science Institute (STScI)

Marko Mecina

University of Vienna

Djamel Mekarnia

Observatoire de la Cote d'Azur

Valerio Nascimbeni

Istituto nazionale di astrofisica (INAF)

Louise D. Nielsen

University of Oxford

Goran Olofsson

Stockholm University

Hugh P. Osborn

Massachusetts Institute of Technology (MIT)

University of Bern

Hannah L. M. Osborne

University College London (UCL)

Roland Ottensamer

University of Vienna

Isabella Pagano

Istituto nazionale di astrofisica (INAF)

Enric Palle

University of La Laguna

Instituto de Astrofísica de Canarias

Gisbert Peter

German Aerospace Center (DLR)

Giampaolo Piotto

University of Padua

Istituto nazionale di astrofisica (INAF)

Don Pollacco

The University of Warwick

Didier Queloz

University of Cambridge

University of Geneva

Roberto Ragazzoni

University of Padua

Istituto nazionale di astrofisica (INAF)

Nicola Rando

European Space Research and Technology Centre (ESA ESTEC)

Heike Rauer

Technische Universität Berlin

Freie Universität Berlin

German Aerospace Center (DLR)

Seth Redfield

Wesleyan University

Ignasi Ribas

Institute of Space Studies of Catalonia (IEEC)

Spanish National Research Council (CSIC)

George R. Ricker

Massachusetts Institute of Technology (MIT)

Martin Rieder

University of Bern

Nuno C. Santos

University of Porto

Gaetano Scandariato

Istituto nazionale di astrofisica (INAF)

Francois-Xavier Schmider

Observatoire de la Cote d'Azur

Richard P. Schwarz

Patashnick Voorheesville Observatory

Nicholas J. Scott

NASA Ames Research Center

Sara Seager

Massachusetts Institute of Technology (MIT)

Damien Segransan

University of Geneva

Luisa Maria Serrano

University of Turin

Attila E. Simon

University of Bern

Alexis M. S. Smith

German Aerospace Center (DLR)

Manfred Steller

Austrian Academy of Sciences

Chris Stockdale

Hazelwood Observatory

Gyula Szabo

Eötvös Loránd University (ELTE)

MTA-ELTE Lendület Milky Way Research Group

Nicolas Thomas

University of Bern

Eric B. Ting

NASA Ames Research Center

Amaury H. M. J. Triaud

University of Birmingham

Stephane Udry

University of Geneva

Vincent Van Eylen

University College London (UCL)

Valerie Van Grootel

University of Liège

Roland K. Vanderspek

Massachusetts Institute of Technology (MIT)

Valentina Viotto

Istituto nazionale di astrofisica (INAF)

Nicholas Walton

University of Cambridge

Joshua N. Winn

Princeton University

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 511 1 1043-1071

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1093/mnras/stab3799

More information

Latest update

9/15/2023