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

Smith, A. M.S. ; Breton, S. N. ; Csizmadia, Sz. ; Dai, F. ; Gandolfi, D. ; García, R. A. ; Howard, A. W. ; Isaacson, H. ; Korth, J. LU and Lam, K. W.F. , et al. (2022) In Monthly Notices of the Royal Astronomical Society 510(4). p.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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planetary systems, Planets and satellites: Detection, Planets and satellites: Individual: K2-99 b, Planets and satellites: Individual: K2-99 c
in
Monthly Notices of the Royal Astronomical Society
volume
510
issue
4
pages
15 pages
publisher
Oxford University Press
external identifiers
  • scopus:85125025977
ISSN
0035-8711
DOI
10.1093/mnras/stab3497
language
English
LU publication?
no
additional info
Publisher Copyright: © 2022 Oxford University Press. All rights reserved.
id
03ee1145-c5da-4857-a6df-8bfa44f99f5c
date added to LUP
2023-02-01 09:40:37
date last changed
2023-02-18 17:13:20
@article{03ee1145-c5da-4857-a6df-8bfa44f99f5c,
  abstract     = {{<p>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.</p>}},
  author       = {{Smith, A. M.S. and Breton, S. N. and Csizmadia, Sz. and Dai, F. and Gandolfi, D. and García, R. A. and Howard, A. W. and Isaacson, H. and Korth, J. and Lam, K. W.F. and Mathur, S. and Nowak, G. and Hernández, F. Pérez and Persson, C. M. and Albrecht, S. H. and Barragán, O. and Cabrera, J. and Cochran, W. D. and Deeg, H. J. and Fridlund, M. and Georgie v a, I. Y. and Goffo, E. and Guenther, E. W. and Hatzes, A. P. and Kabath, P. and Livingston, J. H. and Luque, R. and Palle, E. and Redfield, S. and Rodler, F. and Serrano, L. M. and Van Eylen, V.}},
  issn         = {{0035-8711}},
  keywords     = {{Planetary systems; Planets and satellites: Detection; Planets and satellites: Individual: K2-99 b; Planets and satellites: Individual: K2-99 c}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{4}},
  pages        = {{5035--5049}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{K2-99 revisited : A non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant}},
  url          = {{http://dx.doi.org/10.1093/mnras/stab3497}},
  doi          = {{10.1093/mnras/stab3497}},
  volume       = {{510}},
  year         = {{2022}},
}