Architecture of TOI-561 planetary system
Journal article, 2024

We present new observations from CHEOPS (CHaracterising ExOPlanet Satellite) and TESS (Transiting Exoplanet Survey Satellite) to clarify the architecture of the planetary system hosted by the old Galactic thick disc star TOI-561. Our global analysis, which also includes previously published photometric and radial velocity data, incontrovertibly proves that TOI-561 is hosting at least four transiting planets with periods of 0.44 d (TOI-561 b), 10.8 d (TOI-561 c), 25.7 d (TOI-561 d), and 77.1 d (TOI-561 e) and a fifth non-transiting candidate, TOI-561f with a period of 433 d. The precise characterization of TOI-561's orbital architecture is interesting since old and metal-poor thick disc stars are less likely to host ultrashort-period super-Earths like TOI-561 b. The new period of planet -e is consistent with the value obtained using radial velocity alone and is now known to be 77.14399 ± 0.00025 d, thanks to the new CHEOPS and TESS transits. The new data allowed us to improve its radius (Rp = 2.517 ± 0.045 R⊕ from 5 per cent to 2 per cent precision) and mass(Mp = 12.4 ± 1.4 M?) estimates, implying a density of ρp = 0.778 ± 0.097 ρ⊕. Thanks to recent TESS observations and the focused CHEOPS visit of the transit of TOI-561 e, a good candidate for exomoon searches, the planet's period is finally constrained, allowing us to predict transit times through 2030 with 20-min accuracy. We present an updated version of the internal structure of the four transiting planets. We finally performed a detailed stability analysis, which confirmed the long-term stability of the outer planet TOI-561 f.

planets and satellites: interiors

ephemerides

planets and satellites: fundamental parameters

planets and satellites: dynamical evolution and stability

techniques: photometric

techniques: radial velocities

Author

Giampaolo P. Piotto

University of Padua

Istituto nazionale di astrofisica (INAF)

Tiziano Zingales

University of Padua

Istituto nazionale di astrofisica (INAF)

L. Borsato

Istituto nazionale di astrofisica (INAF)

J. A. Egger

University of Bern

A. Correia

Centre for Physics of the University of Coimbra

A.E. Simon

University of Bern

H.-G. Florén

Stockholm University

S.G. Sousa

University of Porto

P. Maxted

Keele University

D. Nardiello

University of Padua

Istituto nazionale di astrofisica (INAF)

L. Malavolta

Istituto nazionale di astrofisica (INAF)

University of Padua

T.G. Wilson

The University of Warwick

Y. Alibert

University of Bern

V. Adibekyan

University of Porto

A. Bonfanti

Institut fur Weltraumforschung

R. Luque

University of Chicago

N. C. Santos

University of Porto

M.J. Hooton

University of Cambridge

L. Fossati

Institut fur Weltraumforschung

A. M.S. Smith

German Aerospace Center (DLR)

S. Salmon

University of Geneva

G. Lacedelli

Instituto de Astrofísica de Canarias

R. Alonso

Instituto de Astrofísica de Canarias

University of La Laguna

T. Bárczy

Admatis

D. Barrado Navascues

European Space Astronomy Centre (ESAC)

S.C.C. Barros

University of Porto

W. Baumjohann

Institut fur Weltraumforschung

T. Beck

University of Bern

W. Benz

University of Bern

N. Billot

University of Geneva

A. Brandeker

Stockholm University

C. Broeg

University of Bern

M. Buder

German Aerospace Center (DLR)

A. Collier Cameron

University of St Andrews

Szilard Csizmadia

German Aerospace Center (DLR)

P. E. Cubillos

Institut fur Weltraumforschung

Istituto nazionale di astrofisica (INAF)

Melvyn B. Davies

Lund University

M. Deleuil

Laboratoire d'Astrophysique de Marseille

A. Deline

University of Geneva

O. Demangeon

University of Porto

B.O. Demory

University of Bern

A. Derekas

Eötvös Loránd University (ELTE)

Billy Edwards

Netherlands Institute for Space Research (SRON)

D. Ehrenreich

University of Geneva

Anders Erikson

German Aerospace Center (DLR)

A. Fortier

University of Bern

Malcolm Fridlund

Leiden University

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

D. Gandolfi

University of Turin

K. Gazeas

University of Athens

Michaël Gillon

University of Liège

M. Gudel

University of Vienna

Maximilian N. Günther

European Space Research and Technology Centre (ESA ESTEC)

A. Heitzmann

University of Geneva

Ch. Helling

Institut fur Weltraumforschung

Technische Universität Graz

K. Isaak

European Space Research and Technology Centre (ESA ESTEC)

L. L. Kiss

Hungarian Academy of Sciences

Eötvös Loránd University (ELTE)

Judith Korth

Lund University

K. W.F. Lam

German Aerospace Center (DLR)

J. Laskar

Paris Observatory

A. L. des Etangs

Institut d 'Astrophysique de Paris

M. Lendl

University of Geneva

P. Leonardi

University of Trento

University of Padua

D. Magrin

Istituto nazionale di astrofisica (INAF)

G. Mantovan

University of Padua

Istituto nazionale di astrofisica (INAF)

C. Mordasini

University of Bern

Valerio Nascimbeni

Istituto nazionale di astrofisica (INAF)

G. Olofsson

Stockholm University

R. Ottensamer

University of Vienna

I. Pagano

Istituto nazionale di astrofisica (INAF)

Enric Palle

University of La Laguna

Instituto de Astrofísica de Canarias

G. Peter

German Aerospace Center (DLR)

R. Ottensamer

Princeton University

Don L. Pollacco

The University of Warwick

D. Queloz

University of Cambridge

Swiss Federal Institute of Technology in Zürich (ETH)

Roberto Ragazzoni

University of Padua

Istituto nazionale di astrofisica (INAF)

N. Rando

European Space Research and Technology Centre (ESA ESTEC)

F. Ratti

European Space Research and Technology Centre (ESA ESTEC)

H. Rauer

German Aerospace Center (DLR)

Freie Universität Berlin

I. Ribas

Spanish National Research Council (CSIC)

Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)

Gaetano Scandariato

Istituto nazionale di astrofisica (INAF)

D. Segransan

University of Geneva

D. Sicilia

Istituto nazionale di astrofisica (INAF)

M. Stalport

University of Liège

S. Sulis

Laboratoire d'Astrophysique de Marseille

G.M. Szabó

Eötvös Loránd University (ELTE)

HUN-REN-ELTE Exoplanet Research Group

S. Udry

University of Geneva

S. Ulmer-Moll

Institut fur Weltraumforschung

University of Bern

University of Liège

V. Van Grootel

University of Liège

J. Venturini

University of Geneva

E. Villaver

Instituto de Astrofísica de Canarias

University of La Laguna

N. A. Walton

University of Cambridge

J. N. Winn

Princeton University

S. Wolf

University of Geneva

Monthly Notices of the Royal Astronomical Society

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

Vol. 535 3 2763-2774

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

DOI

10.1093/mnras/stae2440

More information

Latest update

3/9/2025 1