K2-99 revisited: A non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant
Journal article, 2022
We report new photometric and spectroscopic observations of the K2-99 planetary system. Asteroseismic analysis of the short-cadence light curve from K2's Campaign 17 allows us to refine the stellar properties. We find K2-99 to be significantly smaller than previously thought, with R = 2.55 ± 0.02 R. The new light curve also contains four transits of K2-99 b, which we use to improve our knowledge of the planetary properties. We find the planet to be a non-inflated warm Jupiter, with Rb = 1.06 ± 0.01 RJup. 60 new radial velocity measurements from HARPS, HARPS-N, and HIRES enable the determination of the orbital parameters of K2-99 c, which were previously poorly constrained. We find that this outer planet has a minimum mass Mcsin ic = 8.4 ± 0.2 MJup, and an eccentric orbit (ec = 0.210 ± 0.009) with a period of 522.2 ± 1.4 d. Upcoming TESS observations in 2022 have a good chance of detecting the transit of this planet, if the mutual inclination between the two planetary orbits is small.
Planetary systems
Planets and satellites: Individual: K2-99 b
Planets and satellites: Individual: K2-99 c
Planets and satellites: Detection
Author
Alexis M. S. Smith
German Aerospace Center (DLR)
S. N. Breton
University Paris-Saclay
Szilard Csizmadia
German Aerospace Center (DLR)
F. Dai
California Institute of Technology (Caltech)
D. Gandolfi
University of Turin
R. A. García
University Paris-Saclay
A. W. Howard
California Institute of Technology (Caltech)
H. Isaacson
University of California
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
K. W.F. Lam
Technische Universität Berlin
German Aerospace Center (DLR)
S. Mathur
Instituto de Astrofísica de Canarias
University of La Laguna
G. Nowak
Instituto de Astrofísica de Canarias
University of La Laguna
F. Pérez Hernández
Instituto de Astrofísica de Canarias
University of La Laguna
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. H. Albrecht
Aarhus University
O. Barragán
University of Oxford
J. Cabrera
German Aerospace Center (DLR)
W. D. Cochran
The University of Texas at Austin
H. J. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
Malcolm Fridlund
Leiden University
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Iskra Georgieva
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
E. Gof fo
University of Turin
Thüringer Landessternwarte Tautenburg
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. Hatzes
Thüringer Landessternwarte Tautenburg
Petr Kabath
Czech Academy of Sciences
J. H. Livingston
University of Tokyo
R. Luque
Institute of Astrophysics of Andalusia (IAA)
Enric Palle
University of La Laguna
Instituto de Astrofísica de Canarias
S. Redfield
Wesleyan University
F. Rodler
European Southern Observatory Santiago
L. M. Serrano
University of Turin
Vincent Van Eylen
University College London (UCL)
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 510 4 5035-5049Subject Categories
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Other Physics Topics
DOI
10.1093/mnras/stab3497