Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
Artikel i vetenskaplig tidskrift, 2022

We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of four transiting planets, namely TOI-561 b (P = 0.45 d, R = 1.42 R-circle plus, M = 2.0 M-circle plus), c (P = 10.78 d, R = 2.91 R-circle plus, M = 5.4 M-circle plus), d (P = 25.7 d, R = 2.82 R-circle plus, M = 13.2 M-circle plus), and e (P = 77 d, R = 2.55 R-circle plus, M = 12.6 R-circle plus). Moreover, we identify an additional, long-period signal (>450 d) in the RVs, which could be due to either an external planetary companion or to stellar magnetic activity. The precise masses and radii obtained for the four planets allowed us to conduct interior structure and atmospheric escape modelling. TOI-561 b is confirmed to be the lowest density (rho(b) = 3.8 +/- 0.5 g cm(-3)) ultra-short period (USP) planet known to date, and the low metallicity of the host star makes it consistent with the general bulk density-stellar metallicity trend. According to our interior structure modelling, planet b has basically no gas envelope, and it could host a certain amount of water. In contrast, TOI-561 c, d, and e likely retained an H/He envelope, in addition to a possibly large water layer. The inferred planetary compositions suggest different atmospheric evolutionary paths, with planets b and c having experienced significant gas loss, and planets d and e showing an atmospheric content consistent with the original one. The uniqueness of the USP planet, the presence of the long-period planet TOI-561 e, and the complex architecture make this system an appealing target for follow-up studies.

stars: individual: TOI-561 (TIC 377064495, Gaia EDR3 3850421005290172416)

planets and satellites: interiors

techniques: radial velocities

planets and satellites: fundamental parameters

techniques: photometric

Författare

G. Lacedelli

Istituto nazionale di astrofisica (INAF)

Università di Padova

T. G. Wilson

University of St Andrews

L. Malavolta

Università di Padova

Istituto nazionale di astrofisica (INAF)

M. J. Hooton

Universität Bern

A. Collier Cameron

University of St Andrews

Y. Alibert

Istituto nazionale di astrofisica (INAF)

Universität Bern

A. Mortier

University of Cambridge

A. Bonfanti

Österreichische Akademie der Wissenschaften

R. D. Haywood

University of Exeter

S. Hoyer

Aix-Marseille Université

G. Piotto

Università di Padova

Istituto nazionale di astrofisica (INAF)

A. Bekkelien

Université de Genève

A. M. Vanderburg

Massachusetts Institute of Technology (MIT)

University of Wisconsin Madison

W. Benz

Universität Bern

X. Dumusque

Université de Genève

A. Deline

Université de Genève

M. Lopez-Morales

Harvard-Smithsonian Center for Astrophysics

L. Borsato

Istituto nazionale di astrofisica (INAF)

K. Rice

University of Edinburgh

L. Fossati

Österreichische Akademie der Wissenschaften

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

A. Brandeker

Stockholms universitet

E. Poretti

Istituto nazionale di astrofisica (INAF)

S. G. Sousa

Universidade do Porto

A. Sozzetti

Istituto nazionale di astrofisica (INAF)

S. Salmon

Université de Genève

C. J. Burke

Massachusetts Institute of Technology (MIT)

V. Van Grootel

Universite de Liège

M. M. Fausnaugh

Massachusetts Institute of Technology (MIT)

V Adibekyan

Universidade do Porto

C. X. Huang

Massachusetts Institute of Technology (MIT)

University of Southern Queensland

H. P. Osborn

Universität Bern

Massachusetts Institute of Technology (MIT)

A. J. Mustill

Lunds universitet

E. Palle

Instituto de Astrofísica de Canarias

V Bourrier

Université de Genève

V Nascimbeni

Istituto nazionale di astrofisica (INAF)

R. Alonso

Universidad de la Laguna

Instituto de Astrofísica de Canarias

G. Anglada

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

T. Barczy

Admatis

D. Barrado y Navascues

Centro de Astrobiología (INTA-CSIC)

S. C. C. Barros

Universidade do Porto

W. Baumjohann

Österreichische Akademie der Wissenschaften

M. Beck

Université de Genève

T. Beck

Universität Bern

N. Billot

Université de Genève

X. Bonfils

Université Grenoble Alpes

C. Broeg

Universität Bern

L. A. Buchhave

Danmarks Tekniske Universitet (DTU)

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Charnoz

Université Paris Descartes

R. Cosentino

Istituto nazionale di astrofisica (INAF)

Sz Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. B. Davies

Lunds universitet

M. Deleuil

Aix-Marseille Université

L. Delrez

Universite de Liège

O. Demangeon

Universidade do Porto

B. -o Demory

Universität Bern

D. Ehrenreich

Université de Genève

A. Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

E. Esparza-Borges

Instituto de Astrofísica de Canarias

Universidad de la Laguna

H. G. Floren

Stockholms universitet

A. Fortier

Universität Bern

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

D. Futyan

Université de Genève

D. Gandolfi

Universita degli Studi di Torino

M. Gillon

Universite de Liège

M. Gudel

Universität Wien

P. Guterman

Institut National des Sciences de l'Univers

Aix-Marseille Université

A. Harutyunyan

Istituto nazionale di astrofisica (INAF)

K. Heng

Universität Bern

The University of Warwick

K. G. Isaak

European Space Research and Technology Centre (ESA ESTEC)

J. M. Jenkins

NASA Ames Research Center

L. Kiss

Konkoly Observatory

Eötvös Loránd University (ELTE)

J. Laskar

Sorbonne Université

A. Lecavelier des Etangs

Université Pierre et Marie Curie (UPMC)

M. Lendl

Université de Genève

C. Lovis

Université de Genève

D. Magrin

Istituto nazionale di astrofisica (INAF)

L. Marafatto

Istituto nazionale di astrofisica (INAF)

A. F. Martinez Fiorenzano

Istituto nazionale di astrofisica (INAF)

P. F. L. Maxted

Keele University

M. Mayor

Université de Genève

G. Micela

Istituto nazionale di astrofisica (INAF)

E. Molinari

Istituto nazionale di astrofisica (INAF)

F. Murgas

Instituto de Astrofísica de Canarias

N. Narita

Astrobiology Center, Japan

University of Tokyo

Instituto de Astrofísica de Canarias

G. Olofsson

Stockholms universitet

R. Ottensamer

Universität Wien

I Pagano

Istituto nazionale di astrofisica (INAF)

A. Pasetti

Hasso-Plattner-Institut fur Softwaresystemtechnik GmbH

M. Pedani

Istituto nazionale di astrofisica (INAF)

F. A. Pepe

Université de Genève

G. Peter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

D. F. Phillips

Harvard-Smithsonian Center for Astrophysics

D. Pollacco

The University of Warwick

D. Queloz

University of Cambridge

Université de Genève

R. Ragazzoni

Università di Padova

Istituto nazionale di astrofisica (INAF)

N. Rando

Europeiska rymdorganisationen (ESA)

F. Ratti

Europeiska rymdorganisationen (ESA)

H. Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Freie Universität Berlin

I Ribas

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

N. C. Santos

Universidade do Porto

D. Sasselov

Harvard-Smithsonian Center for Astrophysics

G. Scandariato

Istituto nazionale di astrofisica (INAF)

S. Seager

Massachusetts Institute of Technology (MIT)

D. Segransan

Université de Genève

L. M. Serrano

Universita degli Studi di Torino

A. E. Simon

Universität Bern

A. M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Steinberger

Österreichische Akademie der Wissenschaften

M. Steller

Österreichische Akademie der Wissenschaften

Gy Szabo

Eötvös Loránd University (ELTE)

N. Thomas

Universität Bern

J. D. Twicken

NASA Ames Research Center

SETI Institute

S. Udry

Université de Genève

N. Walton

University of Cambridge

J. N. Winn

Princeton University

Monthly Notices of the Royal Astronomical Society

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

Vol. 511 3 4551-4571

Ämneskategorier

Oorganisk kemi

Fysikalisk kemi

Astronomi, astrofysik och kosmologi

DOI

10.1093/mnras/stac199

Mer information

Senast uppdaterat

2022-03-17