
Judith Korth
Postdoc

Radial velocity confirmation of K2-100b : A young, highly irradiated, and low-density transiting hot Neptune
Author
Summary, in English
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.
Publishing year
2019-11-21
Language
English
Pages
698-708
Publication/Series
Monthly Notices of the Royal Astronomical Society
Volume
490
Issue
1
Document type
Journal article
Publisher
Oxford University Press
Keywords
- Planets and satellites: individual: K2-100b
- Techniques: photometric
- Techniques: radial velocities
Status
Published
ISBN/ISSN/Other
- ISSN: 0035-8711