TOI-1442 b and TOI-2445 b: Two potentially rocky ultra-short period planets around M dwarfs
Artikel i vetenskaplig tidskrift, 2023

Context. Exoplanets with orbital periods of less than one day are known as ultra-short period (USP) planets. They are relatively rare products of planetary formation and evolution processes, but especially favourable for characterisation with current planet detection methods. At the time of writing, 125 USP planets have already been confirmed. Aims. Our aim is to validate the planetary nature of two new transiting planet candidates around M dwarfs announced by the NASA Transiting Exoplanet Survey Satellite (TESS), registered as TESS Objects of Interest (TOIs) TOI-1442.01 and TOI-2445.01. Methods. We used TESS data, ground-based photometric light curves, and Subaru/IRD spectrograph radial velocity (RV) measurements to validate both planetary candidates and to establish their physical properties. Results. TOI-1442 b is a validated exoplanet with an orbital period of P = 0.4090682 ± 0.0000004 day, a radius of Rp = 1.15 ± 0.06 R☉, and equilibrium temperature of Tp,eq = 1357+−4942 K. TOI-2445 b is also validated with an orbital period of P = 0.3711286 ± 0.0000004 day, a radius of Rp = 1.33 ± 0.09 R☉, and equilibrium temperature of Tp,eq = 1330+−6156 K. Their physical properties align with current empirical trends and formation theories of USP planets. Based on the RV measurements, we set 3σ upper mass limits of 8 M☉ and 20 M☉, thus confirming the non-stellar, sub-Jovian nature of both transiting objects. More RV measurements will be needed to constrain the planetary masses and mean densities, and the predicted presence of outer planetary companions. These targets extend the small sample of USP planets orbiting around M dwarfs up to 21 members. They are also among the 20 most suitable terrestrial planets for atmospheric characterisation via secondary eclipse with the James Webb Space Telescope, according to a widespread emission spectroscopy metric.

planets and satellites: individual: TOI-2445 b

techniques: photometric

planetary systems

planets and satellites: individual: TOI-1442 b

methods: observational

techniques: spectroscopic

Författare

Giuseppe Morello

Universidad de la Laguna

Istituto nazionale di astrofisica (INAF)

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

Instituto de Astrofísica de Canarias

H. Parviainen

Universidad de la Laguna

Instituto de Astrofísica de Canarias

F. Murgas

Instituto de Astrofísica de Canarias

Universidad de la Laguna

E. Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Oshagh

Universidad de la Laguna

Instituto de Astrofísica de Canarias

A. Fukui

University of Tokyo

Instituto de Astrofísica de Canarias

T. Hirano

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Hiroyuki Tako Ishikawa

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

Mayuko Mori

University of Tokyo

Norio Narita

Instituto de Astrofísica de Canarias

National Institutes of Natural Sciences

University of Tokyo

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

Khalid Barkaoui

Universite de Liège

Instituto de Astrofísica de Canarias

Massachusetts Institute of Technology (MIT)

Pablo Lewin

Maury Lewin Astronomical Observatory

C. Cadieux

Université de Montréal

Jerome P. De Leon

University of Tokyo

A. Soubkiou

Université Cadi Ayyad

Universidade do Porto

N. Abreu Garcia

Instituto de Astrofísica de Canarias

Universidad de la Laguna

N. Crouzet

Europeiska rymdorganisationen (ESA)

E. Esparza-Borges

Universidad de la Laguna

Instituto de Astrofísica de Canarias

G. E.Fernández Rodríguez

Instituto de Astrofísica de Canarias

D. Galán

Universidad de la Laguna

Instituto de Astrofísica de Canarias

Yasunori Hori

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

Masahiro Ikoma

National Institutes of Natural Sciences

K. Isogai

University of Tokyo

Kyoto University

T. Kagetani

University of Tokyo

Kiyoe Kawauchi

Instituto de Astrofísica de Canarias

University of Tokyo

Universidad de la Laguna

Tadahiro Kimura

University of Tokyo

T. Kodama

University of Tokyo

Judith Korth

Lunds universitet

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

Takayuki Kotani

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

The Graduate University for Advanced Studies (SOKENDAI)

Vigneshwaran Krishnamurthy

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

S. Kurita

University of Tokyo

A. Laza-Ramos

Instituto de Astrofísica de Canarias

J. Livingston

University of Tokyo

R. Luque

Consejo Superior de Investigaciones Científicas (CSIC)

A. Madrigal-Aguado

Instituto de Astrofísica de Canarias

Universidad de la Laguna

T. Nishiumi

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences

University of Tokyo

J. Orell-Miquel

Instituto de Astrofísica de Canarias

Universidad de la Laguna

M. Puig-Subirà

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Sánchez-Benavente

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Stangret

Universidad de la Laguna

Instituto de Astrofísica de Canarias

Istituto nazionale di astrofisica (INAF)

Motohide Tamura

National Astronomical Observatory of Japan

University of Tokyo

National Institutes of Natural Sciences

Y. Terada

National Taiwan University

Academia Sinica

Noriharu Watanabe

University of Tokyo

Y. Zou

University of Tokyo

Z. Benkhaldoun

Université Cadi Ayyad

K. I. Collins

George Mason University

René Doyon

Université de Montréal

L.J. Garcia

Universite de Liège

M. Ghachoui

Universite de Liège

Université Cadi Ayyad

Michaël Gillon

Universite de Liège

Emmanuel Jehin

Universite de Liège

Francisco J. Pozuelos

Consejo Superior de Investigaciones Científicas (CSIC)

Universite de Liège

R. P. Schwarz

Harvard-Smithsonian Center for Astrophysics

M. Timmermans

Universite de Liège

Astronomy and Astrophysics

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

Vol. 673 A32

Ämneskategorier (SSIF 2011)

Subatomär fysik

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/202243592

Mer information

Senast uppdaterat

2025-04-23