Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
Artikel i vetenskaplig tidskrift, 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.
planetary systems
techniques: photometric
techniques: radial velocities
planets and satellites: atmospheres
stars: low-mass
planets and satellites: individual: TOI-1260b, c
planets and satellites: composition
Författare
Iskra Georgieva
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
O. Barragan
University of Oxford
G. Nowak
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
D. Locci
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
R. Luque
Instituto de Astrofísica de Canarias
Universidad de la Laguna
I Carleo
Wesleyan University
D. Gandolfi
Universita degli Studi di Torino
S. R. Kane
University of California at Riverside
Judith Korth
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
K. G. Stassun
Vanderbilt University
J.H. Livingston
University of Tokyo
E. C. Matthews
Université de Genève
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
Universita degli Studi di Torino
S. Albrecht
Aarhus Universitet
Nordic Optical Telescope
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
The University of Texas at Austin
K. D. Colon
National Aeronautics and Space Administration (NASA)
I. J. M. Crossfield
University of Kansas
Sz Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
H. J. Deeg
Instituto de Astrofísica de Canarias
Universidad de la Laguna
M. Esposito
Thüringer Landessternwarte Tautenburg
E. Furlan
California Institute of Technology (Caltech)
T. Gan
Tsinghua University
E. Goffo
Universita degli Studi di Torino
E. Gonzales
University of California at Santa Cruz
S. Grziwa
Universität zu Köln
E. W. Guenther
Thüringer Landessternwarte Tautenburg
P. Guerra
Observatori Astronòmic Albanya
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 Universitet
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
Deutsches Zentrums für Luft- und Raumfahrt (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 4684-4701Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två rymdteleskop (fas 2)
Rymdstyrelsen (177/19), 2020-01-01 -- 2022-12-31.
Rymdstyrelsen (65/19), 2020-01-01 -- 2022-12-31.
Satellitstudier av exoplaneters mångfald
Rymdstyrelsen (174/18), 2019-02-04 -- 2023-08-01.
Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Annan kemi
Sannolikhetsteori och statistik
DOI
10.1093/mnras/stab1464