The young HD 73583 (TOI-560) planetary system: two 10-M-circle plus mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf
Journal article, 2022

We present the discovery and characterization of two transiting planets observed by TESS in the light curves of the young and bright (V = 9.67) star HD73583 (TOI-560). We perform an intensive spectroscopic and photometric space- and ground-based follow-up in order to confirm and characterize the system. We found that HD73583 is a young (similar to 500 Myr) active star with a rotational period of 12.08 +/- 0.11 d, and a mass and radius of 0.73 +/- 0.02 M-circle dot and 0.65 +/- 0.02 R-circle dot, respectively. HD 73583 b (P-b = 6.3980420(-0.0000062)(+0.0000067 )d) has a mass and radius of 10.2(-3.1)(+3.4) M-circle plus and 2.79 +/- 0.10 R-circle plus, respectively, which gives a density of 2.58(-0.81)(+0.95) g cm(-3). HD 73583 c (P-c = 18.87974(-0.00074)(+0.00086) d) has a mass and radius of 9.7(-1.7)(+1.8) M-circle plus and 2.39(-0.09)(+0.10) R-circle plus, respectively, which translates to a density of 3.88(-0.80)(+0.91) g cm(-3). Both planets are consistent with worlds made of a solid core surrounded by a volatile envelope. Because of their youth and host star brightness, they both are excellent candidates to perform transmission spectroscopy studies. We expect ongoing atmospheric mass-loss for both planets caused by stellar irradiation. We estimate that the detection of evaporating signatures on H and He would be challenging, but doable with present and future instruments.

techniques: radial velocities

stars: activity

planets and satellites: individual: HD 73583 (TOI-560)

techniques: photometric

Author

O. Barragan

University of Oxford

D. J. Armstrong

The University of Warwick

D. Gandolfi

University of Turin

I Carleo

Indiana University

A. A. Vidotto

Leiden University

C. Villarreal D'Angelo

Instituto de Astronomía Teórica y Experimental (IATE)

A. Oklopcic

University of Amsterdam

H. Isaacson

University of California at Berkeley

D. Oddo

University of New Mexico

K. Collins

Harvard-Smithsonian Center for Astrophysics

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

S. G. Sousa

University of Porto

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

C. Hellier

Keele University

S. Howell

NASA Ames Research Center

A. Howard

University of California at Berkeley

S. Redfield

Wesleyan University

N. Eisner

University of Oxford

Iskra Georgieva

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

D. Dragomir

University of New Mexico

D. Bayliss

The University of Warwick

L. D. Nielsen

University of Geneva

University of Oxford

B. Klein

University of Oxford

S. Aigrain

University of Oxford

M. Zhang

California Institute of Technology (Caltech)

J. Teske

Carnegie Institution for Science

J. D. Twicken

NASA Ames Research Center

SETI Institute

J. Jenkins

NASA Ames Research Center

M. Esposito

Thüringer Landessternwarte Tautenburg

V. Van Eylen

University College London (UCL)

F. Rodler

European Southern Observatory Santiago

V Adibekyan

University of Porto

J. Alarcon

European Southern Observatory Santiago

D. R. Anderson

The University of Warwick

J. M. Akana Murphy

University of California at Santa Cruz

D. Barrado

Spanish Astrobiology Center (INTA-CSIC)

S. C. C. Barros

University of Porto

B. Benneke

Université de Montréal

F. Bouchy

University of Geneva

E. M. Bryant

The University of Warwick

R. P. Butler

Carnegie Institution for Science

J. Burt

California Institute of Technology (Caltech)

J. Cabrera

German Aerospace Center (DLR)

S. Casewell

University Of Leicester

P. Chaturvedi

Thüringer Landessternwarte Tautenburg

R. Cloutier

Harvard-Smithsonian Center for Astrophysics

W. D. Cochran

The University of Texas at Austin

J. Crane

Carnegie Observatories

I Crossfield

University of Kansas

N. Crouzet

European Space Research and Technology Centre (ESA ESTEC)

Collins

George Mason University

F. Dai

Massachusetts Institute of Technology (MIT)

Princeton University

H. J. Deeg

University of La Laguna

Instituto de Astrofísica de Canarias

A. Deline

University of Geneva

O. D. S. Demangeon

University of Porto

X. Dumusque

University of Geneva

P. Figueira

University of Porto

European Southern Observatory Santiago

E. Furlan

California Institute of Technology (Caltech)

C. Gnilka

California Institute of Technology (Caltech)

M. R. Goad

University Of Leicester

E. Goffo

University of Turin

Thüringer Landessternwarte Tautenburg

F. Gutierrez-Canales

Universidad de Guanajuato

A. Hadjigeorghiou

The University of Warwick

Z. Hartman

NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab)

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

M. Harris

University of New Mexico

B. Henderson

University Of Leicester

T. Hirano

National Institutes of Natural Sciences

Astrobiology Center, Japan

S. Hojjatpanah

Aix Marseille University

S. Hoyer

Aix Marseille University

P. Kabath

Czech Academy of Sciences

Judith Korth

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

J. Lillo-Box

Centro de Astrobiologia (CAB)

R. Luque

Institute of Astrophysics of Andalusia (IAA)

M. Marmier

University of Geneva

T. Mocnik

NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab)

Alexandra Muresan

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

F. Murgas

University of La Laguna

Instituto de Astrofísica de Canarias

E. Nagel

Universidad de Guanajuato

H. L. M. Osborne

University College London (UCL)

A. Osborn

The University of Warwick

H. P. Osborn

University of Bern

Massachusetts Institute of Technology (MIT)

E. Palle

Instituto de Astrofísica de Canarias

University of La Laguna

M. Raimbault

University of Geneva

G. R. Ricker

Massachusetts Institute of Technology (MIT)

R. A. Rubenzahl

California Institute of Technology (Caltech)

C. Stockdale

Hazelwood Observatory

N. C. Santos

University of Porto

N. Scott

NASA Ames Research Center

R. P. Schwarz

Patashnick Voorheesville Observatory

S. Shectman

Carnegie Observatories

S. Seager

Massachusetts Institute of Technology (MIT)

D. Segransan

University of Geneva

L. M. Serrano

University of Turin

M. Skarka

Czech Academy of Sciences

Masaryk University

A. M. S. Smith

University Of Leicester

J. Subjak

Charles University

Czech Academy of Sciences

T. G. Tan

Perth Exoplanet Survey Telescope

Curtin University

S. Udry

University of Geneva

C. Watson

Queen's University Belfast

P. J. Wheatley

The University of Warwick

R. West

The University of Warwick

J. N. Winn

Princeton University

S. X. Wang

Tsinghua University

A. Wolfgang

SiteZeus

C. Ziegler

Stephen F. Austin State University

Monthly Notices of the Royal Astronomical Society

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

Vol. 514 2 1606-1627

Subject Categories

Subatomic Physics

Astronomy, Astrophysics and Cosmology

Other Physics Topics

DOI

10.1093/mnras/stac638

More information

Latest update

6/28/2022