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Radial velocity confirmation of K2-100b: a young, highly irradiated, and low density transiting hot Neptune | | O. Barragán
; S. Aigrain
; D. Kubyshkina
; D. Gandolfi
; J. Livingston
; M. C. V. Fridlund
; L. Fossati
; J. Korth
; H. Parviainen
; L. Malavolta
; E. Palle
; H. J. Deeg
; G. Nowak
; V. M. Rajpaul
; N. Zicher
; G. Antoniciello
; N. Narita
; S. Albrecht
; L. R. Bedin
; J. Cabrera
; W. D. Cochran
; J. de Leon
; Ph. Eigmüller
; A. Fukui
; V. Granata
; S. Grziwa
; E. Guenther
; A. P. Hatzes
; N. Kusakabe
; D. W. Latham
; M. Libralato
; R. Luque
; P. Montañés-Rodríguez
; F. Murgas
; D. Nardiello
; I. Pagano
; G. Piotto
; C. M. Persson
; S. Redfield
; M. Tamura
; | | Date: |
11 Sep 2019 | | 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 days. We model the activity-induced
radial velocity variations of the host star with a multi-dimensional Gaussian
Process framework and detect a planetary signal of $10.6 pm 3.0 {
m
m,s^{-1}}$, which matches the transit ephemeris, and translates to a planet
mass of $21.8 pm 6.2 M_oplus$. 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, $2.04^{+0.66}_{-0.61} {
m g,cm^{-3}}$, implies that K2-100b
retains a significant volatile envelope. We estimate that the planet is losing
its atmosphere at a rate of $10^{11}-10^{12},{
m g,s^{-1}}$ due to the high
level of radiation it receives from its host star. | | Source: | arXiv, 1909.5252 | | Services: | Forum | Review | PDF | Favorites | |
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