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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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dc.contributor.authorVan Grootel, V-
dc.contributor.authorGillon, M-
dc.contributor.authorValencia, D-
dc.contributor.authorMadhusudhan, N-
dc.contributor.authorDragomir, D-
dc.contributor.authorHowe, AR-
dc.contributor.authorBurrows, Adam S.-
dc.identifier.citationVan 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/201510102006en_US
dc.description.abstractSuper-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.en_US
dc.relation.ispartofEuropean Physical Journal Web of Conferencesen_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleHD 97658 and its super-Earthen_US
dc.typeConference Articleen_US

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