English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Super-Earths transiting nearby bright stars are key objects thatsimultaneously allow for accurate measurements of both their mass and radius,providing essential constraints on their internal composition. We present herethe confirmation, based on Spitzer transit observations, that the super-EarthHD 97658 b transits its host star. HD 97658 is a low-mass($M_*=0.77\pm0.05\,M_{\odot}$) K1 dwarf, as determined from the Hipparcosparallax and stellar evolution modeling. To constrain the planet parameters, wecarry out Bayesian global analyses of Keck-HIRES radial velocities, and MOSTand Spitzer photometry. HD 97658 b is a massive ($M_P=7.55^{+0.83}_{-0.79}M_{\oplus}$) and large ($R_{P} = 2.247^{+0.098}_{-0.095} R_{\oplus}$ at 4.5$\mu$m) super-Earth. We investigate the possible internal compositions for HD97658 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 futureasteroseismic observations can improve the knowledge of the HD 97658 system, inparticular by constraining its age. Orbiting a bright host star, HD 97658 bwill be a key target for coming space missions TESS, CHEOPS, PLATO, and alsoJWST, to characterize thoroughly its structure and atmosphere.

Transit confirmation and improved stellar and planet parameters for the super-Earth HD 97658 b and its host star