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dc.contributor.authorKosiarek, Molly R.
dc.contributor.authorBlunt, Sarah
dc.contributor.authorLopez-Morales, Mercedes
dc.contributor.authorCrossfield, Ian J. M.
dc.contributor.authorSinukoff, Evan
dc.contributor.authorPetigura, Erik A.
dc.contributor.authorGonzales, Erica J.
dc.contributor.authorPoretti, Ennio
dc.contributor.authorMalavolta, Luca
dc.contributor.authorHoward, Andrew W.
dc.contributor.authorIsaacson, Howard
dc.contributor.authorHaywood, Raphaelle D.
dc.contributor.authorCiardi, David R.
dc.contributor.authorBristow, Makennah
dc.contributor.authorCameron, Andrew Collier
dc.contributor.authorCharbonneau, David
dc.contributor.authorDressing, Courtney D.
dc.contributor.authorFigueird, Pedro
dc.contributor.authorFulton, Benjamin J.
dc.contributor.authorHardee, Bronwen J.
dc.contributor.authorHirsch, Lea A.
dc.contributor.authorLatham, David W.
dc.contributor.authorMortier, Annelies
dc.contributor.authorNava, Chantanelle
dc.contributor.authorSchlieder, Joshua E.
dc.contributor.authorVanderburg, Andrew
dc.contributor.authorWeiss, Lauren
dc.contributor.authorBonomo, Aldo S.
dc.contributor.authorBouchy, Francois
dc.contributor.authorBuchhave, Lars A.
dc.contributor.authorCoffinet, Adrien
dc.contributor.authorDamasso, Mario
dc.contributor.authorDumusque, Xavier
dc.contributor.authorLovis, Christophe
dc.contributor.authorMayor, Michel
dc.contributor.authorMicela, Giusi
dc.contributor.authorMolinari, Emilio
dc.contributor.authorPepe, Francesco
dc.contributor.authorPhillips, David
dc.contributor.authorPiotto, Giampaolo
dc.contributor.authorRice, Ken
dc.contributor.authorSasselov, Dimitar
dc.contributor.authorSegransan, Damien
dc.contributor.authorSozzetti, Alessandro
dc.contributor.authorUdry, Stephane
dc.contributor.authorWatson, Chris
dc.identifier.citationKosiarek , M R , Blunt , S , Lopez-Morales , M , Crossfield , I J M , Sinukoff , E , Petigura , E A , Gonzales , E J , Poretti , E , Malavolta , L , Howard , A W , Isaacson , H , Haywood , R D , Ciardi , D R , Bristow , M , Cameron , A C , Charbonneau , D , Dressing , C D , Figueird , P , Fulton , B J , Hardee , B J , Hirsch , L A , Latham , D W , Mortier , A , Nava , C , Schlieder , J E , Vanderburg , A , Weiss , L , Bonomo , A S , Bouchy , F , Buchhave , L A , Coffinet , A , Damasso , M , Dumusque , X , Lovis , C , Mayor , M , Micela , G , Molinari , E , Pepe , F , Phillips , D , Piotto , G , Rice , K , Sasselov , D , Segransan , D , Sozzetti , A , Udry , S & Watson , C 2019 , ' K2-291b : a rocky super-Earth in a 2.2 day orbit ' , Astronomical Journal , vol. 157 , no. 3 , 116 .
dc.identifier.otherORCID: /0000-0002-8863-7828/work/58531432
dc.descriptionA.C.C. acknowledges support from STFC consolidated grant number ST/M001296/1. The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant Agreement No. 313014 (ETAEARTH).en
dc.description.abstractK2-291 is a solar-type star with a radius of R-* = 0.899 +/- 0.034 R-circle dot and mass of M-* = 0.934 +/- 0.038 M-circle dot. From the K2 C13 data, we found one super-Earth planet (R-p = 1.589(-0.072)(+0.095)R(circle plus)) transiting this star on a short period orbit (P = 2.225177(-6.8e-5)(+6.6e-5) days). We followed this system up with adaptive-optic imaging and spectroscopy to derive stellar parameters, search for stellar companions, and determine a planet mass. From our 75 radial velocity measurements using High Resolution Echelle Spectrometer on Keck I and High Accuracy Radial velocity Planet Searcher in the northern hemisphere on Telescopio Nazionale Galileo, we constrained the mass of K2-291 b to M-p = 6.49 +/- 1.16 M-circle plus. We found it necessary to model correlated stellar activity radial velocity signals with a Gaussian process (GP) in order to more accurately model the effect of stellar noise on our data; the addition of the GP also improved the precision of this mass measurement. With a bulk density of rho = 8.84(-2.03)(+2.50)g cm(-3), the planet is consistent with an Earth-like rock/iron composition and no substantial gaseous envelope. Such an envelope, if it existed in the past, was likely eroded away by photoevaporation during the first billion years of the star's lifetime.
dc.relation.ispartofAstronomical Journalen
dc.subjectPlanets and satellites: compositionen
dc.subjectPlanets and satellites: detectionen
dc.subjectTechniques: radial velocitiesen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleK2-291b : a rocky super-Earth in a 2.2 day orbiten
dc.typeJournal articleen
dc.contributor.sponsorEuropean Commissionen
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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