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dc.contributor.authorMortier, A
dc.contributor.authorZapatero Osorio, M R
dc.contributor.authorMalavolta, L
dc.contributor.authorAlibert, Y
dc.contributor.authorRice, K
dc.contributor.authorLillo-Box, J
dc.contributor.authorVanderburg, A
dc.contributor.authorOshagh, M
dc.contributor.authorBuchhave, L
dc.contributor.authorAdibekyan, V
dc.contributor.authorDelgado Mena, E
dc.contributor.authorLopez-Morales, M
dc.contributor.authorCharbonneau, D
dc.contributor.authorSousa, S G
dc.contributor.authorLovis, C
dc.contributor.authorAffer, L
dc.contributor.authorAllende Prieto, C
dc.contributor.authorBarros, S C C
dc.contributor.authorBenatti, S
dc.contributor.authorBonomo, A S
dc.contributor.authorBoschin, W
dc.contributor.authorBouchy, F
dc.contributor.authorCabral, A
dc.contributor.authorCollier Cameron, A
dc.contributor.authorCosentino, R
dc.contributor.authorCristiani, S
dc.contributor.authorDemangeon, O D S
dc.contributor.authorDi Marcantonio, P
dc.contributor.authorD’Odorico, V
dc.contributor.authorDumusque, X
dc.contributor.authorEhrenreich, D
dc.contributor.authorFigueira, P
dc.contributor.authorFiorenzano, A
dc.contributor.authorGhedina, A
dc.contributor.authorGonzález Hernández, J I
dc.contributor.authorHaldemann, J
dc.contributor.authorHarutyunyan, A
dc.contributor.authorHaywood, R D
dc.contributor.authorLatham, D W
dc.contributor.authorLavie, B
dc.contributor.authorLo Curto, G
dc.contributor.authorMaldonado, J
dc.contributor.authorManescau, A
dc.contributor.authorMartins, C J A P
dc.contributor.authorMayor, M
dc.contributor.authorMégevand, D
dc.contributor.authorMehner, A
dc.contributor.authorMicela, G
dc.contributor.authorMolaro, P
dc.contributor.authorMolinari, E
dc.contributor.authorNunes, N J
dc.contributor.authorPepe, F A
dc.contributor.authorPalle, E
dc.contributor.authorPhillips, D
dc.contributor.authorPiotto, G
dc.contributor.authorPinamonti, M
dc.contributor.authorPoretti, E
dc.contributor.authorRiva, M
dc.contributor.authorRebolo, R
dc.contributor.authorSantos, N C
dc.contributor.authorSasselov, D
dc.contributor.authorSozzetti, A
dc.contributor.authorSuárez Mascareño, A
dc.contributor.authorUdry, S
dc.contributor.authorWest, R G
dc.contributor.authorWatson, C A
dc.contributor.authorWilson, T G
dc.identifier.citationMortier , A , Zapatero Osorio , M R , Malavolta , L , Alibert , Y , Rice , K , Lillo-Box , J , Vanderburg , A , Oshagh , M , Buchhave , L , Adibekyan , V , Delgado Mena , E , Lopez-Morales , M , Charbonneau , D , Sousa , S G , Lovis , C , Affer , L , Allende Prieto , C , Barros , S C C , Benatti , S , Bonomo , A S , Boschin , W , Bouchy , F , Cabral , A , Collier Cameron , A , Cosentino , R , Cristiani , S , Demangeon , O D S , Di Marcantonio , P , D’Odorico , V , Dumusque , X , Ehrenreich , D , Figueira , P , Fiorenzano , A , Ghedina , A , González Hernández , J I , Haldemann , J , Harutyunyan , A , Haywood , R D , Latham , D W , Lavie , B , Lo Curto , G , Maldonado , J , Manescau , A , Martins , C J A P , Mayor , M , Mégevand , D , Mehner , A , Micela , G , Molaro , P , Molinari , E , Nunes , N J , Pepe , F A , Palle , E , Phillips , D , Piotto , G , Pinamonti , M , Poretti , E , Riva , M , Rebolo , R , Santos , N C , Sasselov , D , Sozzetti , A , Suárez Mascareño , A , Udry , S , West , R G , Watson , C A & Wilson , T G 2020 , ' K2-111 : an old system with two planets in near-resonance ' , Monthly Notices of the Royal Astronomical Society , vol. 499 , no. 4 , pp. 5004-5021 .
dc.identifier.othercrossref: 10.1093/mnras/staa3144
dc.identifier.otherBibtex: 10.1093/mnras/staa3144
dc.identifier.otherORCID: /0000-0002-8863-7828/work/85562465
dc.identifier.otherORCID: /0000-0001-8749-1962/work/86987360
dc.descriptionACC acknowledges support from the Science and Technology Facilities Council (STFC) consolidated grant number ST/R000824/1. CAW would like to acknowledge support from UK STFC grant ST/P000312/1. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (project FOUR ACES; grant agreement no. 724427).en
dc.description.abstractThis paper reports on the detailed characterization of the K2-111 planetary system with K2, WASP, and ASAS-SN photometry, as well as high-resolution spectroscopic data from HARPS-N and ESPRESSO. The host, K2-111, is confirmed to be a mildly evolved (log g = 4.17), iron-poor ([Fe/H] = −0.46), but alpha-enhanced ([α/Fe]=0.27), chromospherically quiet, very old thick disc G2 star. A global fit, performed by using PyORBIT, shows that the transiting planet, K2-111 b, orbits with a period Pb = 5.3518 ± 0.0004 d and has a planet radius of 1.82+0.11−0.091.82−0.09+0.11 R⊕ and a mass of 5.29+0.76−0.775.29−0.77+0.76 M⊕, resulting in a bulk density slightly lower than that of the Earth. The stellar chemical composition and the planet properties are consistent with K2-111 b being a terrestrial planet with an iron core mass fraction lower than the Earth. We announce the existence of a second signal in the radial velocity data that we attribute to a non-transiting planet, K2-111 c, with an orbital period of 15.6785 ± 0.0064 d, orbiting in near-3:1 mean motion resonance with the transiting planet, and a minimum planet mass of 11.3 ± 1.1 M⊕. Both planet signals are independently detected in the HARPS-N and ESPRESSO data when fitted separately. There are potentially more planets in this resonant system, but more well-sampled data are required to confirm their presence and physical parameters.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectTechniques: photometricen
dc.subjectTechniques: radial velocitiesen
dc.subjectTechniques: spectroscopicen
dc.subjectPlanets and satellites: detectionen
dc.subjectStars: individual (K2-111)en
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleK2-111 : an old system with two planets in near-resonanceen
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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