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Radial velocity confirmation of K2-100b : A young, highly irradiated, and low-density transiting hot Neptune

Barragán, O. ; Aigrain, S. ; Kubyshkina, D. ; Gandolfi, D. ; Livingston, J. ; Fridlund, M. C.V. ; Fossati, L. ; Korth, J. LU ; Parviainen, H. and Malavolta, L. , et al. (2019) In Monthly Notices of the Royal Astronomical Society 490(1). p.698-708
Abstract

We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 d. We model the activity-induced radial velocity variations of the host star with a multidimensional Gaussian Process framework and detect a planetary signal of 10.6 ± 3.0 m s−1, which matches the transit ephemeris, and translates to a planet mass of 21.8 ± 6.2 M. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet,... (More)

We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 d. We model the activity-induced radial velocity variations of the host star with a multidimensional Gaussian Process framework and detect a planetary signal of 10.6 ± 3.0 m s−1, which matches the transit ephemeris, and translates to a planet mass of 21.8 ± 6.2 M. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet, 2.04+−006661 g cm−3, implies that K2-100b retains a significant volatile envelope. We estimate that the planet is losing its atmosphere at a rate of 1011–1012 g s−1 due to the high level of radiation it receives from its host star.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planets and satellites: individual: K2-100b, Techniques: photometric, Techniques: radial velocities
in
Monthly Notices of the Royal Astronomical Society
volume
490
issue
1
pages
11 pages
publisher
Oxford University Press
external identifiers
  • scopus:85075236110
ISSN
0035-8711
DOI
10.1093/mnras/stz2569
language
English
LU publication?
no
additional info
Publisher Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
id
a821d438-2f56-4d32-92e3-6d389b2f3ddc
date added to LUP
2023-02-02 10:17:15
date last changed
2023-02-20 13:44:18
@article{a821d438-2f56-4d32-92e3-6d389b2f3ddc,
  abstract     = {{<p>We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 d. We model the activity-induced radial velocity variations of the host star with a multidimensional Gaussian Process framework and detect a planetary signal of 10.6 ± 3.0 m s<sup>−1</sup>, which matches the transit ephemeris, and translates to a planet mass of 21.8 ± 6.2 M. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet, 2.04<sup>+</sup><sub>−</sub><sup>0</sup><sub>0</sub><sup>66</sup><sub>61</sub> g cm<sup>−3</sup>, implies that K2-100b retains a significant volatile envelope. We estimate that the planet is losing its atmosphere at a rate of 10<sup>11</sup>–10<sup>12</sup> g s<sup>−1</sup> due to the high level of radiation it receives from its host star.</p>}},
  author       = {{Barragán, O. and Aigrain, S. and Kubyshkina, D. and Gandolfi, D. and Livingston, J. and Fridlund, M. C.V. and Fossati, L. and Korth, J. and Parviainen, H. and Malavolta, L. and Palle, E. and Deeg, H. J. and Nowak, G. and Rajpaul, V. M. and Zicher, N. and Antoniciello, G. and Narita, N. and Albrecht, S. and Bedin, L. R. and Cabrera, J. and Cochran, W. D. and De Leon, J. and Eigmüller, P. and Fukui, A. and Granata, V. and Grziwa, S. and Guenther, E. and Hatzes, A. P. and Kusakabe, N. and Latham, D. W. and Libralato, M. and Luque, R. and Montañés-Rodríguez, P. and Murgas, F. and Nardiello, D. and Pagano, I. and Piotto, G. and Persson, C. M. and Redfield, S. and Tamura, M.}},
  issn         = {{0035-8711}},
  keywords     = {{Planets and satellites: individual: K2-100b; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{1}},
  pages        = {{698--708}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{Radial velocity confirmation of K2-100b : A young, highly irradiated, and low-density transiting hot Neptune}},
  url          = {{http://dx.doi.org/10.1093/mnras/stz2569}},
  doi          = {{10.1093/mnras/stz2569}},
  volume       = {{490}},
  year         = {{2019}},
}