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HD 97658 and its super-Earth

Author(s): Van Grootel, V; Gillon, M; Valencia, D; Madhusudhan, N; Dragomir, D; et al

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Abstract: Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present the confirmation, based on Spitzer observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a low-mass (M∗=0.77±0.05M ) K1 dwarf, as determined from the Hipparcos parallax and stellar evolution modeling. To constrain the planet parameters, we carry out Bayesian global analyses of Keck-HIRES radial velocities, and MOST and Spitzer photometry. HD97658 b is a massive (MP=7.55+0.83−0.79M⊕) and large (RP=2.247+0.098−0.095R⊕at 4.5μm)super-Earth. We investigate the possible internal compositions for HD 97658 b. Our results indicate a large rocky component, by at least 60% by mass, and very little H-He components, at most 2% by mass. We also discuss how future asteroseismic observation scan improve the knowledge of the HD 97658 system, in particular by constraining its age.
Publication Date: Sep-2015
Electronic Publication Date: 23-Sep-2015
Citation: Van Grootel, V, Gillon, M, Valencia, D, Madhusudhan, N, Dragomir, D, Howe, AR, Burrows, AS. (2015). HD 97658 and its super-Earth. European Physical Journal Web of Conferences, 101 (02006 - 02006. doi:10.1051/epjconf/201510102006
DOI: doi:10.1051/epjconf/201510102006
Type of Material: Conference Article
Journal/Proceeding Title: European Physical Journal Web of Conferences
Version: Final published version. This is an open access article.

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