Radial velocity confirmation of K2-100b: A young, highly irradiated, and low-density transiting hot Neptune
Journal article, 2019

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.

Techniques: photometric

Techniques: radial velocities

Planets and satellites: individual: K2-100b

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Published in

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 490Issue 1p. 698-708

Research Project(s)

Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects

Swedish National Space Board (174/18), 2017-01-01 -- 2022-12-31.

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Subject Categories

Medical Laboratory and Measurements Technologies

Astronomy, Astrophysics and Cosmology

Signal Processing

Roots

Basic sciences

Infrastructure

Onsala Space Observatory

Identifiers

DOI

10.1093/mnras/stz2569

More information

Latest update

9/15/2023