TOI-1749: an M dwarf with a Trio of Planets including a Near-resonant Pair
Artikel i vetenskaplig tidskrift, 2021

We report the discovery of one super-Earth- (TOI-1749b) and two sub-Neptune-sized planets (TOI-1749c and TOI-1749d) transiting an early M dwarf at a distance of 100 pc, which were first identified as planetary candidates using data from the TESS photometric survey. We have followed up this system from the ground by means of multiband transit photometry, adaptive optics imaging, and low-resolution spectroscopy, from which we have validated the planetary nature of the candidates. We find that TOI-1749b, c, and d have orbital periods of 2.39, 4.49, and 9.05 days, and radii of 1.4, 2.1, and 2.5 R (circle plus), respectively. We also place 95% confidence upper limits on the masses of 57, 14, and 15 M (circle plus) for TOI-1749b, c, and d, respectively, from transit timing variations. The periods, sizes, and tentative masses of these planets are in line with a scenario in which all three planets initially had a hydrogen envelope on top of a rocky core, and only the envelope of the innermost planet has been stripped away by photoevaporation and/or core-powered mass-loss mechanisms. These planets are similar to other planetary trios found around M dwarfs, such as TOI-175b,c,d and TOI-270b,c,d, in the sense that the outer pair has a period ratio within 1% of 2. Such a characteristic orbital configuration, in which an additional planet is located interior to a near 2:1 period-ratio pair, is relatively rare around FGK dwarfs.

Författare

A. Fukui

University of Tokyo

Instituto de Astrofísica de Canarias

Judith Korth

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

J. H. Livingston

University of Tokyo

J. D. Twicken

National Aeronautics and Space Administration (NASA)

SETI Institute

M. R. Zapatero Osorio

Consejo Superior de Investigaciones Científicas (CSIC)

J. M. Jenkins

National Aeronautics and Space Administration (NASA)

M. Mori

University of Tokyo

F. Murgas

Instituto de Astrofísica de Canarias

Universidad de la Laguna

M. Ogihara

Tokyo Institute of Technology

National Astronomical Observatory of Japan

N. Narita

University of Tokyo

Instituto de Astrofísica de Canarias

Astrobiology Center, Japan

Japan Science and Technology Agency

E. Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

K. G. Stassun

Vanderbilt University

Fisk University

G. Nowak

Universidad de la Laguna

Instituto de Astrofísica de Canarias

D. R. Ciardi

California Institute of Technology (Caltech)

L. Alvarez-Hernandez

Universidad de la Laguna

V. J. S. Bejar

Universidad de la Laguna

Instituto de Astrofísica de Canarias

N. Casasayas-Barris

Universiteit Leiden

N. Crouzet

Europeiska rymdorganisationen (ESA)

J. P. de Leon

University of Tokyo

E. Esparza-Borges

Universidad de la Laguna

D. Hidalgo Soto

Universidad de la Laguna

Instituto de Astrofísica de Canarias

K. Isogai

University of Tokyo

Kyoto University

K. Kawauchi

University of Tokyo

Instituto de Astrofísica de Canarias

P. Klagyivik

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

T. Kodama

University of Tokyo

S. Kurita

University of Tokyo

N. Kusakabe

Astrobiology Center, Japan

National Astronomical Observatory of Japan

R. Luque

Universidad de la Laguna

Consejo Superior de Investigaciones Científicas (CSIC)

Instituto de Astrofísica de Canarias

A. Madrigal-Aguado

Universidad de la Laguna

Instituto de Astrofísica de Canarias

P. Montanes Rodriguez

Universidad de la Laguna

Instituto de Astrofísica de Canarias

Giuseppe Morello

Universidad de la Laguna

Instituto de Astrofísica de Canarias

T. Nishiumi

Astrobiology Center, Japan

The Graduate University for Advanced Studies (SOKENDAI)

J. Orell-Miquel

Instituto de Astrofísica de Canarias

Universidad de la Laguna

M. Oshagh

Universidad de la Laguna

Instituto de Astrofísica de Canarias

H. Parviainen

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Sanchez-Benavente

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Stangret

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Y. Terada

National Taiwan University

Academia Sinica

N. Watanabe

University of Tokyo

G. Chen

Chinese Academy of Sciences

M. Tamura

National Astronomical Observatory of Japan

University of Tokyo

Astrobiology Center, Japan

P. Bosch-Cabot

Observatori Astronòmic Albanya

M. Bowen

George Mason University

K. Eastridge

George Mason University

L. Freour

Danmarks Tekniske Universitet (DTU)

E. Gonzales

University of California at Santa Cruz

P. Guerra

Observatori Astronòmic Albanya

Y. Jundiyeh

Danmarks Tekniske Universitet (DTU)

T. K. Kim

George Mason University

Thomas Jefferson High School

Kroer

Danmarks Tekniske Universitet (DTU)

A. M. Levine

Massachusetts Institute of Technology (MIT)

E. H. Morgan

Massachusetts Institute of Technology (MIT)

M. Reefe

George Mason University

R. Tronsgaard

Danmarks Tekniske Universitet (DTU)

C. K. Wedderkopp

Danmarks Tekniske Universitet (DTU)

J. Wittrock

George Mason University

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

K. Hesse

Wesleyan University

D. W. Latham

Harvard-Smithsonian Center for Astrophysics

G. R. Ricker

Massachusetts Institute of Technology (MIT)

S. Seager

Massachusetts Institute of Technology (MIT)

R. Vanderspek

Massachusetts Institute of Technology (MIT)

J. Winn

Princeton University

E. Bachelet

Las Cumbres Observatory Global Telescope Network

M. Bowman

Las Cumbres Observatory Global Telescope Network

C. McCully

Las Cumbres Observatory Global Telescope Network

M. Daily

Las Cumbres Observatory Global Telescope Network

D. Harbeck

Las Cumbres Observatory Global Telescope Network

N. H. Volgenau

Las Cumbres Observatory Global Telescope Network

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 162 4 167

Ämneskategorier (SSIF 2011)

Subatomär fysik

Astronomi, astrofysik och kosmologi

Annan fysik

DOI

10.3847/1538-3881/ac13a5

Mer information

Senast uppdaterat

2025-04-23