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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the strategy and results of our radial velocity follow-up campaignwith the SOPHIE spectrograph (1.93-m OHP) of four transiting planetarycandidates discovered by the Kepler space mission. We discuss the selection ofthe candidates KOI-428, KOI-410, KOI-552, and KOI-423. KOI-428 was establishedas a hot Jupiter transiting the largest and the most evolved star discovered sofar and is described by Santerne et al. (2011a). KOI-410 does not presentradial velocity change greater than 120 m/s, which allows us to exclude at 3sigma a transiting companion heavier than 3.4 Mjup. KOI-552b appears to be atransiting low-mass star with a mass ratio of 0.15. KOI-423b is a newtransiting companion in the overlapping region between massive planets andbrown dwarfs. With a radius of 1.22 +- 0.11 Rjup and a mass of 18.0 +- 0.92Mjup, KOI-423b is orbiting an F7IV star with a period of 21.0874 +- 0.0002 daysand an eccentricity of 0.12 +- 0.02. From the four selected Kepler candidates,at least three of them have a Jupiter-size transiting companion, but two ofthem are not in the mass domain of Jupiter-like planets. KOI-423b and KOI-522bare members of a growing population of known massive companions orbiting closeto an F-type star. This population currently appears to be absent around G-typestars, possibly due to their rapid braking and the engulfment of theircompanions by tidal decay.

SOPHIE velocimetry of Kepler transit candidates III. KOI-423b: an 18 Mjup transiting companion around an F7IV star