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1.	Barragán, O., et al. (author) Radial velocity confirmation of K2-100b: A young, highly irradiated, and low-density transiting hot Neptune 2019 In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 490:1, s. 698-708 Journal article (peer-reviewed)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+−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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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Nowak, G. (1); Fukui, A. (1); Fossati, L. (1); Fridlund, Malcolm, 1 ... (1); Gandolfi, D. (1); Pagano, I. (1); show more...; Piotto, Giampaolo P. (1); Kusakabe, Nobuhiko (1); Tamura, Motohide (1); Redfield, S. (1); Cabrera, J (1); Korth, Judith (1); Barragán, O. (1); Persson, Carina, 196 ... (1); Grziwa, S. (1); Guenther, E. W. (1); Livingston, J.H. (1); Narita, Norio (1); Albrecht, Simon (1); Antoniciello, Giulia ... (1); Cochran, William D. (1); Deeg, H. (1); Eigmüller, P. (1); Hatzes, A. (1); Palle, E. (1); Aigrain, S. (1); Kubyshkina, D. (1); Parviainen, H. (1); Malavolta, L. (1); Rajpaul, V. M. (1); Zicher, N. (1); Bedin, L. R. (1); De Leon, Jerome P. (1); Granata, V. (1); Latham, D. W. (1); Libralato, M. (1); Luque, R. (1); Rodriguez, P. M. (1); Murgas, F. (1); Nardiello, D. (1); show less...

University: Chalmers University of Technology (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1); Engineering and Technology (1)

Year: 2019 (1)

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