The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap
Artikel i vetenskaplig tidskrift, 2019
We report the discovery of a super-Earth and a sub-Neptune transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V = 9) K1 dwarf observed by the Transiting Exoplanet Survey Satellite (TESS) in Sectors 3 and 4. We combine the TESS photometry with archival High Accuracy Radial velocity Planet Searcher spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets. With an orbital period of 4.8 days, a mass of {7.51}-1.01+1.09 {M}\oplus and a radius of 1.64 ± 0.06 R ⊕, HD 15337 b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD 15337 c has an orbital period of 17.2 days, a mass of {8.11}-1.69+1.82 {{{M}}}\oplus , and a radius of 2.39 ± 0.12 R ⊕, suggesting that the planet might be surrounded by a thick atmospheric envelope. The two planets have similar masses and lie on opposite sides of the radius gap, and are thus an excellent testbed for planet formation and evolution theories. Assuming that HD 15337 c hosts a hydrogen-dominated envelope, we employ a recently developed planet atmospheric evolution algorithm in a Bayesian framework to estimate the history of the high-energy (extreme ultraviolet and X-ray) emission of the host star. We find that at an age of 150 Myr, the star possessed on average between 3.7 and 127 times the high-energy luminosity of the current Sun.
planets and satellites: detection
planets and satellites: fundamental parameters
stars: fundamental parameters
planets and satellites: individual: HD15337 b & c
planetary systems
Författare
D. Gandolfi
Universita degli Studi di Torino
L. Fossati
IWF
J. H. Livingston
University of Tokyo
K.G. Stassun
Fisk University
Vanderbilt University
S. Grziwa
Universität zu Köln
O. Barragan
University of Oxford
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Universiteit Leiden
D. Kubyshkina
IWF
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
F. Dai
Massachusetts Institute of Technology (MIT)
Princeton University
K. W. F. Lam
Technische Universität Berlin
S. Albrecht
Aarhus Universitet
N. Batalha
University of California
P. G. Beck
Universidad de la Laguna
Instituto de Astrofísica de Canarias
A. B. Justesen
Aarhus Universitet
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. P. Cartwright
Universidad de la Laguna
W. D. Cochran
The University of Texas at Austin
Sz. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. D. Davies
NASA Ames Research Center
H. J. Deeg
Instituto de Astrofísica de Canarias
Universidad de la Laguna
Ph. Eigmüller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Endl
The University of Texas at Austin
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Esposito
Thüringer Landessternwarte Tautenburg
R. A. García
Université Paris Diderot
R. Goeke
Massachusetts Institute of Technology (MIT)
L. González-Cuesta
Universidad de la Laguna
Instituto de Astrofísica de Canarias
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
D. Hidalgo
Instituto de Astrofísica de Canarias
T. Hirano
Tokyo Institute of Technology
M. Hjorth
Aarhus Universitet
P. Kabath
Czech Academy of Sciences
E. Knudstrup
Aarhus Universitet
J. Korth
Czech Academy of Sciences
J. Li
NASA Ames Research Center
R. Luque
Instituto de Astrofísica de Canarias
Universidad de la Laguna
S. Mathur
Instituto de Astrofísica de Canarias
Universidad de la Laguna
P. Montanes Rodriguez
Universidad de la Laguna
Instituto de Astrofísica de Canarias
N. Narita
Instituto de Astrofísica de Canarias
National Institutes of Natural Sciences
University of Tokyo
Japan Science and Technology Agency
D. Nespral
Universidad de la Laguna
Instituto de Astrofísica de Canarias
P. Niraula
Massachusetts Institute of Technology (MIT)
G. Nowak
Instituto de Astrofísica de Canarias
Universidad de la Laguna
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
M. Pätzold
Fisk University
J. Prieto-Arranz
Universidad de la Laguna
Instituto de Astrofísica de Canarias
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
Freie Universität Berlin
S. Redfield
Wesleyan University
I Ribas
Institut d'Estudis Espacials de Catalunya (IEEC)
Institut de Ciències de l'Espai (ICE) - CSIC
M. Skarka
Masarykova Univerzita
Czech Academy of Sciences
A. M S Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P. Rowden
Open University
G. Torres
Harvard-Smithsonian Center for Astrophysics
Vincent Van Eylen
Princeton University
Michael L. Vezie
Massachusetts Institute of Technology (MIT)
Astrophysical Journal Letters
2041-8205 (ISSN) 2041-8213 (eISSN)
Vol. 876 2 L24Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 2017-01-01 -- 2022-12-31.
Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.3847/2041-8213/ab17d9