Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
Journal article, 2021
We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of R-b = 2.33 +/- 0.10 and R-c = 2.82 +/- 0.15 R-circle plus, and periods of 3.13 and 7.49 d for TOI-1260b and TOI-1260c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain M-b = and M-c = M-circle plus. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2-3 R-circle plus range.
planets and satellites: individual: TOI-1260b, c
planets and satellites: composition
techniques: photometric
planetary systems
planets and satellites: atmospheres
techniques: radial velocities
stars: low-mass
Author
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
O. Barragan
University of Oxford
G. Nowak
Instituto de Astrofísica de Canarias
University of La Laguna
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
D. Locci
Istituto nazionale di astrofisica (INAF)
E. Palle
University of La Laguna
Instituto de Astrofísica de Canarias
R. Luque
University of La Laguna
Instituto de Astrofísica de Canarias
I Carleo
Wesleyan University
D. Gandolfi
University of Turin
S. R. Kane
University of California at Riverside
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
K. G. Stassun
Vanderbilt University
J.H. Livingston
University of Tokyo
E. C. Matthews
University of Geneva
Massachusetts Institute of Technology (MIT)
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
S. B. Howell
National Aeronautics and Space Administration (NASA)
L. M. Serrano
University of Turin
S. Albrecht
Nordic Optical Telescope
Aarhus University
A. Bieryla
Harvard-Smithsonian Center for Astrophysics
C. E. Brasseur
Space Telescope Science Institute (STScI)
D. Ciardi
California Institute of Technology (Caltech)
W. D. Cochran
University of Texas
K. D. Colon
National Aeronautics and Space Administration (NASA)
I. J. M. Crossfield
University of Kansas
Sz Csizmadia
German Aerospace Center (DLR)
H. J. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
M. Esposito
Thüringer Landessternwarte Tautenburg
E. Furlan
California Institute of Technology (Caltech)
T. Gan
Tsinghua University
E. Goffo
University of Turin
E. Gonzales
University of California at Santa Cruz
S. Grziwa
University of Cologne
E. W. Guenther
Thüringer Landessternwarte Tautenburg
P. Guerra
Albanyà Astronomical Observatory
T. Hirano
National Institutes of Natural Sciences
J. M. Jenkins
National Aeronautics and Space Administration (NASA)
E. L. N. Jensen
Swarthmore College
P. Kabath
Czech Academy of Sciences
E. Knudstrup
Aarhus University
Nordic Optical Telescope
K. W. F. Lam
Technische Universität Berlin
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
R. A. Matson
US Naval Observatory
H. L. M. Osborne
University College London (UCL)
S. McDermott
Protologic LLC
M. Paegert
Harvard-Smithsonian Center for Astrophysics
S. N. Quinn
Harvard-Smithsonian Center for Astrophysics
S. Redfield
Wesleyan University
G. R. Ricker
Massachusetts Institute of Technology (MIT)
J. E. Schlieder
National Aeronautics and Space Administration (NASA)
N. J. Scott
National Aeronautics and Space Administration (NASA)
S. Seager
Massachusetts Institute of Technology (MIT)
A. M. S. Smith
German Aerospace Center (DLR)
P. Tenenbaum
National Aeronautics and Space Administration (NASA)
SETI Institute
J. D. Twicken
SETI Institute
National Aeronautics and Space Administration (NASA)
R. Vanderspek
Massachusetts Institute of Technology (MIT)
V. Van Eylen
University College London (UCL)
J. N. Winn
Princeton University
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 505 4 4684-4701Exoplanet diversity with satellite studies
Swedish National Space Board (174/18), 2019-02-04 -- 2023-08-01.
Exoplanets from space -CHEOPS and PLATO ESA's next two projects (Phase 2)
Swedish National Space Board (65/19), 2020-01-01 -- 2022-12-31.
Swedish National Space Board (177/19), 2020-01-01 -- 2022-12-31.
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Other Chemistry Topics
Probability Theory and Statistics
DOI
10.1093/mnras/stab1464