TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
Journal article, 2022

We report the discovery and characterization of two small transiting planets orbiting the bright M3.0V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period planet, TOI-1468 b (P-b = 1.88 d), has a planetary mass of M-b = 3.21 +/- 0.24M(circle plus) and a radius of R-b = 1.280(-0.039)(+0.038) R-circle plus, resulting in a density of rho(b) = 8.39(-0.92)(+1.05) g cm(-3), which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c (P-c = 15.53 d), we derive a mass of M-c = 6.64(-0.68)(+0.67) M-circle plus,aradius of R-c = 2.06 +/- 0.04 R-circle plus, and a bulk density of rho(c) = 2.00(-0.19)(+0.21) g cm(-3), which corresponds to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet formation and evolution scenarios.

techniques: photometric

stars: individual: TOI-1468

techniques: radial velocities

stars: late-type

Author

P. Chaturvedi

Thüringer Landessternwarte Tautenburg

P. Bluhm

Heidelberg University

E. Nagel

University of Hamburg

Thüringer Landessternwarte Tautenburg

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

Giuseppe Morello

University of La Laguna

Instituto de Astrofísica de Canarias

M. Brady

University of Chicago

Judith Korth

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

K. Molaverdikhani

Ludwig Maximilian University of Munich (LMU)

Exzellenzcluster Origins

Heidelberg University

D. Kossakowski

Max Planck Society

J. A. Caballero

European Space Agency (ESA)

E. W. Guenther

Thüringer Landessternwarte Tautenburg

E. Palle

University of La Laguna

Instituto de Astrofísica de Canarias

N. Espinoza

Space Telescope Science Institute (STScI)

A. Seifahrt

University of Chicago

N. Lodieu

University of La Laguna

Instituto de Astrofísica de Canarias

C. Cifuentes

European Space Agency (ESA)

E. Furlan

California Institute of Technology (Caltech)

P. J. Amado

Spanish National Research Council (CSIC)

T. Barclay

University of Maryland

National Aeronautics and Space Administration (NASA)

J. Bean

University of Chicago

V. J. S. Bejar

University of La Laguna

Instituto de Astrofísica de Canarias

G. Bergond

CAHA- Centro Astronómico Hispano-Alemán

A. W. Boyle

California Institute of Technology (Caltech)

D. Ciardi

California Institute of Technology (Caltech)

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

Collins

George Mason University

E. Esparza-Borges

University of La Laguna

Instituto de Astrofísica de Canarias

A. Fukui

University of Tokyo

Instituto de Astrofísica de Canarias

C. L. Gnilka

National Aeronautics and Space Administration (NASA)

R. Goeke

Massachusetts Institute of Technology (MIT)

P. Guerra

Albanyà Astronomical Observatory

Th Henning

Max Planck Society

E. Herrero

Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)

Spanish National Research Council (CSIC)

S. B. Howell

National Aeronautics and Space Administration (NASA)

Jeffers

Max Planck Society

J. M. Jenkins

National Aeronautics and Space Administration (NASA)

E. L. N. Jensen

Swarthmore College

D. Kasper

University of Chicago

T. Kodama

University of Tokyo

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

M. J. Lopez-Gonzalez

Spanish National Research Council (CSIC)

R. Luque

University of Chicago

D. Montes

Complutense University

J. C. Morales

Spanish National Research Council (CSIC)

Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)

M. Mori

University of Tokyo

F. Murgas

Instituto de Astrofísica de Canarias

N. Narita

Instituto de Astrofísica de Canarias

University of Tokyo

Astrobiology Center, Japan

G. Nowak

University of La Laguna

Instituto de Astrofísica de Canarias

H. Parviainen

Instituto de Astrofísica de Canarias

University of La Laguna

V. M. Passegger

University of Hamburg

University of Oklahoma

A. Quirrenbach

Heidelberg University

S. Reffert

Heidelberg University

A. Reiners

University of Göttingen

I Ribas

Spanish National Research Council (CSIC)

Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)

G. R. Ricker

Massachusetts Institute of Technology (MIT)

E. Rodriguez

Spanish National Research Council (CSIC)

C. Rodriguez-Lopez

Spanish National Research Council (CSIC)

M. Schlecker

University of Arizona

Max Planck Society

R. P. Schwarz

Patashnick Voorheesville Observatory

A. Schweitzer

University of Hamburg

S. Seager

Massachusetts Institute of Technology (MIT)

G. Stefansson

Princeton University

C. Stockdale

Hazelwood Observatory

L. Tal-Or

Ariel University

University of Göttingen

J. D. Twicken

SETI Institute

National Aeronautics and Space Administration (NASA)

S. Vanaverbeke

KU Leuven

AstroLAB IRIS

Vereniging vor Sterrenkunde

G. Wang

Tsinghua International School

D. Watanabe

Planetary Discoveries

J. N. Winn

Princeton University

M. Zechmeister

University of Göttingen

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 666 A155

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

Other Physics Topics

DOI

10.1051/0004-6361/202244056

More information

Latest update

4/23/2025