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
Instituto de Astrofísica de Canarias
University of Tokyo
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
J. H. Livingston
University of Tokyo
J. D. Twicken
National Aeronautics and Space Administration (NASA)
SETI Institute
M. R. Zapatero Osorio
Spanish National Research Council (CSIC)
J. M. Jenkins
National Aeronautics and Space Administration (NASA)
M. Mori
University of Tokyo
F. Murgas
Instituto de Astrofísica de Canarias
University of La Laguna
M. Ogihara
Tokyo Institute of Technology
National Astronomical Observatory of Japan
N. Narita
Instituto de Astrofísica de Canarias
Japan Science and Technology Agency
Astrobiology Center, Japan
University of Tokyo
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
K. G. Stassun
Vanderbilt University
Fisk University
G. Nowak
Instituto de Astrofísica de Canarias
University of La Laguna
D. R. Ciardi
California Institute of Technology (Caltech)
L. Alvarez-Hernandez
University of La Laguna
V. J. S. Bejar
University of La Laguna
Instituto de Astrofísica de Canarias
N. Casasayas-Barris
Leiden University
N. Crouzet
European Space Agency (ESA)
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
University of Tokyo
Kyoto University
K. Kawauchi
Instituto de Astrofísica de Canarias
University of Tokyo
P. Klagyivik
German Aerospace Center (DLR)
T. Kodama
University of Tokyo
S. Kurita
University of Tokyo
N. Kusakabe
Astrobiology Center, Japan
National Astronomical Observatory of Japan
R. Luque
Spanish National Research Council (CSIC)
Instituto de Astrofísica de Canarias
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
Giuseppe Morello
Instituto de Astrofísica de Canarias
University of La Laguna
T. Nishiumi
The Graduate University for Advanced Studies (SOKENDAI)
Astrobiology Center, Japan
J. Orell-Miquel
Instituto de Astrofísica de Canarias
University of La Laguna
M. Oshagh
University of La Laguna
Instituto de Astrofísica de Canarias
H. Parviainen
University of La Laguna
Instituto de Astrofísica de Canarias
M. Sanchez-Benavente
University of La Laguna
Instituto de Astrofísica de Canarias
M. Stangret
University of La Laguna
Instituto de Astrofísica de Canarias
Y. Terada
Academia Sinica
National Taiwan University
N. Watanabe
University of Tokyo
G. Chen
Chinese Academy of Sciences
M. Tamura
University of Tokyo
Astrobiology Center, Japan
National Astronomical Observatory of 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
P. Guerra
Albanyà Astronomical Observatory
Y. Jundiyeh
Technical University of Denmark (DTU)
T. K. Kim
George Mason University
Thomas Jefferson High School
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 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 167Subject Categories (SSIF 2011)
Subatomic Physics
Astronomy, Astrophysics and Cosmology
Other Physics Topics
DOI
10.3847/1538-3881/ac13a5