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dc.contributor.authorOsborn, H. P.
dc.contributor.authorSanterne, A.
dc.contributor.authorBarros, S. C. C.
dc.contributor.authorSantos, N. C.
dc.contributor.authorDumusque, X.
dc.contributor.authorMalavolta, L.
dc.contributor.authorArmstrong, D. J.
dc.contributor.authorHojjatpanah, S.
dc.contributor.authorDemangeon, O.
dc.contributor.authorAdibekyan, V.
dc.contributor.authorAlmenara, J.-M.
dc.contributor.authorBarrado, D.
dc.contributor.authorBayliss, D.
dc.contributor.authorBoisse, I.
dc.contributor.authorBouchy, F.
dc.contributor.authorBrown, D. J. A.
dc.contributor.authorCameron, A. C.
dc.contributor.authorCharbonneau, D.
dc.contributor.authorDeleuil, M.
dc.contributor.authorDelgado Mena, E.
dc.contributor.authorDíaz, R. F.
dc.contributor.authorHébrard, G.
dc.contributor.authorKirk, J.
dc.contributor.authorKing, G.W.
dc.contributor.authorLam, K. W. F.
dc.contributor.authorLatham, D.
dc.contributor.authorLillo-Box, J.
dc.contributor.authorLouden, T. M.
dc.contributor.authorLovis, C.
dc.contributor.authorMarmier, M.
dc.contributor.authorMcCormac, J.
dc.contributor.authorMolinari, E.
dc.contributor.authorPepe, F.
dc.contributor.authorPollacco, D.
dc.contributor.authorSousa, S. G.
dc.contributor.authorUdry, S.
dc.contributor.authorWalker, S. R.
dc.identifier.citationOsborn , H P , Santerne , A , Barros , S C C , Santos , N C , Dumusque , X , Malavolta , L , Armstrong , D J , Hojjatpanah , S , Demangeon , O , Adibekyan , V , Almenara , J-M , Barrado , D , Bayliss , D , Boisse , I , Bouchy , F , Brown , D J A , Cameron , A C , Charbonneau , D , Deleuil , M , Delgado Mena , E , Díaz , R F , Hébrard , G , Kirk , J , King , G W , Lam , K W F , Latham , D , Lillo-Box , J , Louden , T M , Lovis , C , Marmier , M , McCormac , J , Molinari , E , Pepe , F , Pollacco , D , Sousa , S G , Udry , S & Walker , S R 2017 , ' K2-110 b: a massive mini-Neptune exoplanet ' , Astronomy & Astrophysics , vol. 604 , A19 .
dc.identifier.otherPURE: 250675298
dc.identifier.otherPURE UUID: 9358d024-863a-41a2-97ce-b0aeffe15d15
dc.identifier.otherBibCode: 2017A&A...604A..19O
dc.identifier.otherScopus: 85026470515
dc.identifier.otherORCID: /0000-0002-8863-7828/work/58531487
dc.identifier.otherWOS: 000408480100007
dc.description.abstractWe report the discovery of the exoplanet K2-110 b (previously EPIC212521166b) from K2 photometry orbiting in a 13.8637d period around an old, metal-poor K3 dwarf star. With a V-band magnitude of 11.9,K2-110 is particularly amenable to RV follow-up. A joint analysis of K2 photometry and high-precision RVs from 28 HARPS and HARPS-N spectra reveal it to have a radius of 2.6 ± 0.1R⊕ and amass of 16.7 ± 3.2M⊕, hence a density of 5.2± 1.2 g cm-3, making it one of the most massive planets yet to be found with a sub-Neptune radius. When accounting for compression, the resulting Earth-like density is best fitted by a 0.2M⊕ hydrogen atmosphere over an 16.5M⊕ Earth-like interior, although the planet could also have significant water content. At 0.1 AU, even taking into account the old stellar age of 8 ± 3 Gyr, the planet is unlikely to have been significantly affected by EUV evaporation. However the planet likely disc-migrated to its current position making the lack of a thick H2 atmosphere puzzling. This analysis has made K2-110 b one of the best-characterised mini-Neptunes with density constrained to less than 30%.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.rights© 2017, ESO. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at /
dc.subjectPlanets and satellitesen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleK2-110 b: a massive mini-Neptune exoplaneten
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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