TOI-1749: an M dwarf with a Trio of Planets including a Near-resonant Pair
Journal article, 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.

Author

A. Fukui

University of Tokyo

Instituto de Astrofísica de Canarias

Judith Korth

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Extragalactic Astrophysics

J. H. Livingston

University of Tokyo

J. D. Twicken

NASA Ames Research Center

SETI Institute

M. R. Zapatero Osorio

Spanish Astrobiology Center (INTA-CSIC)

J. M. Jenkins

NASA Ames Research Center

M. Mori

University of Tokyo

F. Murgas

University of 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

University of La Laguna

Instituto de Astrofísica de Canarias

K. G. Stassun

Vanderbilt University

Fisk University

G. Nowak

University of La Laguna

Instituto de Astrofísica de Canarias

D. R. Ciardi

California Institute of Technology (Caltech)

L. Alvarez-Hernandez

University of La Laguna

V. J. S. Bejar

Instituto de Astrofísica de Canarias

University of La Laguna

N. Casasayas-Barris

Leiden University

N. Crouzet

European Space Research and Technology Centre (ESA ESTEC)

J. P. de Leon

University of Tokyo

E. Esparza-Borges

University of La Laguna

D. Hidalgo Soto

Instituto de Astrofísica de Canarias

University of La Laguna

K. Isogai

Kyoto University

University of Tokyo

K. Kawauchi

University of Tokyo

Instituto de Astrofísica de Canarias

P. Klagyivik

German Aerospace Center (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

Institute of Astrophysics of Andalusia (IAA)

University of La Laguna

A. Madrigal-Aguado

University of La Laguna

Instituto de Astrofísica de Canarias

P. Montanes Rodriguez

University of La Laguna

Instituto de Astrofísica de Canarias

G. Morello

University of La Laguna

Instituto de Astrofísica de Canarias

T. Nishiumi

The Graduate University for Advanced Studies (SOKENDAI)

Astrobiology Center, Japan

J. Orell-Miquel

University of La Laguna

Instituto de Astrofísica de Canarias

M. Oshagh

Instituto de Astrofísica de Canarias

University of La Laguna

H. Parviainen

Instituto de Astrofísica de Canarias

University of La Laguna

M. Sanchez-Benavente

University of La Laguna

Instituto de Astrofísica de Canarias

M. Stangret

Instituto de Astrofísica de Canarias

University of 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

Albanyà Astronomical Observatory

M. Bowen

George Mason University

K. Eastridge

George Mason University

L. Freour

Technical University of Denmark (DTU)

E. Gonzales

University of California at Santa Cruz

P. Guerra

Albanyà Astronomical Observatory

Y. Jundiyeh

Technical University of Denmark (DTU)

T. K. Kim

George Mason University

Thomas Jefferson High Sch Sci & Technol, 6560 Braddock Rd

Kroer

Technical University of Denmark (DTU)

A. M. Levine

Massachusetts Institute of Technology (MIT)

E. H. Morgan

Massachusetts Institute of Technology (MIT)

M. Reefe

George Mason University

R. Tronsgaard

Technical University of Denmark (DTU)

C. K. Wedderkopp

Technical University of Denmark (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

Subject Categories

Subatomic Physics

Astronomy, Astrophysics and Cosmology

Other Physics Topics

DOI

10.3847/1538-3881/ac13a5

More information

Latest update

10/14/2021