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, Extragalaktisk astrofysik

J. H. Livingston

University of Tokyo

J. D. Twicken

NASA Ames Research Center

SETI Institute

M. R. Zapatero Osorio

Centro de Astrobiología (INTA-CSIC)

J. M. Jenkins

NASA Ames Research Center

M. Mori

University of Tokyo

F. Murgas

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Ogihara

National Astronomical Observatory of Japan

Tokyo Institute of Technology

N. Narita

Astrobiology Center, Japan

Instituto de Astrofísica de Canarias

Japan Science and Technology Agency

University of Tokyo

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

Instituto de Astrofísica de Canarias

Universidad de la Laguna

N. Casasayas-Barris

Universiteit Leiden

N. Crouzet

European Space Research and Technology Centre (ESA ESTEC)

J. P. de Leon

University of Tokyo

E. Esparza-Borges

Universidad de la Laguna

D. Hidalgo Soto

Instituto de Astrofísica de Canarias

Universidad de la Laguna

K. Isogai

Kyoto University

University of Tokyo

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

National Astronomical Observatory of Japan

Astrobiology Center, Japan

R. Luque

Instituto de Astrofísica de Canarias

Instituto de Astrofisica de Andalucía (IAA)

Universidad de la Laguna

A. Madrigal-Aguado

Universidad de la Laguna

Instituto de Astrofísica de Canarias

P. Montanes Rodriguez

Universidad de la Laguna

Instituto de Astrofísica de Canarias

G. Morello

Universidad de la Laguna

Instituto de Astrofísica de Canarias

T. Nishiumi

The Graduate University for Advanced Studies (SOKENDAI)

Astrobiology Center, Japan

J. Orell-Miquel

Universidad de la Laguna

Instituto de Astrofísica de Canarias

M. Oshagh

Instituto de Astrofísica de Canarias

Universidad de la Laguna

H. Parviainen

Instituto de Astrofísica de Canarias

Universidad de la Laguna

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

University of Tokyo

National Astronomical Observatory of Japan

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 Sch Sci & Technol, 6560 Braddock Rd

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 Observ, 6740 Cortona Dr, Ste 102

M. Bowman

Las Cumbres Observ, 6740 Cortona Dr, Ste 102

C. McCully

Las Cumbres Observ, 6740 Cortona Dr, Ste 102

M. Daily

Las Cumbres Observ, 6740 Cortona Dr, Ste 102

D. Harbeck

Las Cumbres Observ, 6740 Cortona Dr, Ste 102

N. H. Volgenau

Las Cumbres Observ, 6740 Cortona Dr, Ste 102

Astronomical Journal

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

Vol. 162 4 167

Ämneskategorier

Subatomär fysik

Astronomi, astrofysik och kosmologi

Annan fysik

DOI

10.3847/1538-3881/ac13a5

Mer information

Senast uppdaterat

2021-10-14