K2-99 revisited: A non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant

DOI: 
10.1093/mnras/stab3497
Publication date: 
01/03/2022
Main author: 
Smith A.M.S.
IAA authors: 
Luque, R.
Authors: 
Smith, A. M.S.;Breton, S. N.;Csizmadia, S.;Dai, F.;Gandolfi, D.;García, R. A.;Howard, A. W.;Isaacson, H.;Korth, J.;Lam, K. W.F.;Mathur, S.;Nowak, G.;Hernández, F. Pérez;Persson, C. M.;Albrecht, S. H.;Barragán, O.;Cabrera, J.;Cochran, W. D.;Deeg, H. J.;Fridlund, M.;Georgie v a, I. Y.;Gof fo, E.;Guenther, E. W.;Hatzes, A. P.;Kabath, P.;Livingston, J. H.;Luque, R.;Palle, E.;Redfield, S.;Rodler, F.;Serrano, L. M.;Van Eylen, V.
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
510.0
Pages: 
5035-5049
Abstract: 
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.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022MNRAS.510.5035S/abstract
ADS Bibcode: 
2022MNRAS.510.5035S
Keywords: 
Planetary systems | Planets and satellites: Detection | Planets and satellites: Individual: K2-99 b | Planets and satellites: Individual: K2-99 c