Characterization of the K2-18 multi-planetary system with HARPS

Author: Cloutier R.   Astudillo-Defru N.   Doyon R.   Bonfils X.   Almenara J.-M.   Benneke B.   Bouchy F.   Delfosse X.   Ehrenreich D.   Forveille T.   Lovis C.   Mayor M.   Menou K.   Murgas F.   Pepe F.   Rowe J.   Santos N. C.   Udry S.   Wünsche A.  

Publisher: Edp Sciences

E-ISSN: 1432-0746|608|issue|A35-A35

ISSN: 0004-6361

Source: Astronomy & Astrophysics, Vol.608, Iss.issue, 2017-12, pp. : A35-A35

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Abstract

Aims. The bright M2.5 dwarf K2-18 (Ms = 0.36 M, Rs = 0.41 R) at 34 pc is known to host a transiting super-Earth-sized planet orbiting within the star’s habitable zone; K2-18b. Given the superlative nature of this system for studying an exoplanetary atmosphere receiving similar levels of insolation as the Earth, we aim to characterize the planet’s mass which is required to interpret atmospheric properties and infer the planet’s bulk composition.

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