Radial velocity confirmation of K2-100b: a young, highly irradiated, and low-density transiting hot Neptune
Date Issued
2019
Author(s)
Barragán, O.
•
Aigrain, S.
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Kubyshkina, D.
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Gandolfi, D.
•
Livingston, J.
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Fridlund, M. C. V.
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Fossati, L.
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Korth, J.
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Parviainen, H.
•
•
Palle, E.
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Deeg, H. J.
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Nowak, G.
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Rajpaul, V. M.
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Zicher, N.
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Antoniciello, G.
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Narita, N.
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Albrecht, S.
•
•
Cabrera, J.
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Cochran, W. D.
•
de Leon, J.
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Eigmüller, Ph
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Fukui, A.
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Granata, V.
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Grziwa, S.
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Guenther, E.
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Hatzes, A. P.
•
Kusakabe, N.
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Latham, D. W.
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Libralato, M.
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Luque, R.
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Montañés-Rodríguez, P.
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Murgas, F.
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Nardiello, D.
•
•
Piotto, G.
•
Persson, C. M.
•
Redfield, S.
•
Tamura, M.
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, 2.04 _{ - 0.61 } ^ { + 0.66 } {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} {g s^{-1}} due to the high level of radiation it receives from its host star.
Volume
490
Issue
1
Start page
698
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.490..698B
Rights
open.access
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