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dc.contributor.authorBonomo, Aldo S.
dc.contributor.authorZeng, Li
dc.contributor.authorDamasso, Mario
dc.contributor.authorLeinhardt, Zoë M.
dc.contributor.authorJustesen, Anders B.
dc.contributor.authorLopez, Eric
dc.contributor.authorLund, Mikkel N.
dc.contributor.authorMalavolta, Luca
dc.contributor.authorSilva Aguirre, Victor
dc.contributor.authorBuchhave, Lars A.
dc.contributor.authorCorsaro, Enrico
dc.contributor.authorDenman, Thomas
dc.contributor.authorLopez-Morales, Mercedes
dc.contributor.authorMills, Sean M.
dc.contributor.authorMortier, Annelies
dc.contributor.authorRice, Ken
dc.contributor.authorSozzetti, Alessandro
dc.contributor.authorVanderburg, Andrew
dc.contributor.authorAffer, Laura
dc.contributor.authorArentoft, Torben
dc.contributor.authorBenbakoura, Mansour
dc.contributor.authorBouchy, François
dc.contributor.authorChristensen-Dalsgaard, Jørgen
dc.contributor.authorCollier Cameron, Andrew
dc.contributor.authorCosentino, Rosario
dc.contributor.authorDressing, Courtney D.
dc.contributor.authorDumusque, Xavier
dc.contributor.authorFigueira, Pedro
dc.contributor.authorFiorenzano, Aldo F. M.
dc.contributor.authorGarcía, Rafael A.
dc.contributor.authorHandberg, Rasmus
dc.contributor.authorHarutyunyan, Avet
dc.contributor.authorJohnson, John A.
dc.contributor.authorKjeldsen, Hans
dc.contributor.authorLatham, David W.
dc.contributor.authorLovis, Christophe
dc.contributor.authorLundkvist, Mia S.
dc.contributor.authorMathur, Savita
dc.contributor.authorMayor, Michel
dc.contributor.authorMicela, Giusi
dc.contributor.authorMolinari, Emilio
dc.contributor.authorMotalebi, Fatemeh
dc.contributor.authorNascimbeni, Valerio
dc.contributor.authorNava, Chantanelle
dc.contributor.authorPepe, Francesco
dc.contributor.authorPhillips, David F.
dc.contributor.authorPiotto, Giampaolo
dc.contributor.authorPoretti, Ennio
dc.contributor.authorSasselov, Dimitar
dc.contributor.authorSégransan, Damien
dc.contributor.authorUdry, Stéphane
dc.contributor.authorWatson, Chris
dc.identifier.citationBonomo , A S , Zeng , L , Damasso , M , Leinhardt , Z M , Justesen , A B , Lopez , E , Lund , M N , Malavolta , L , Silva Aguirre , V , Buchhave , L A , Corsaro , E , Denman , T , Lopez-Morales , M , Mills , S M , Mortier , A , Rice , K , Sozzetti , A , Vanderburg , A , Affer , L , Arentoft , T , Benbakoura , M , Bouchy , F , Christensen-Dalsgaard , J , Collier Cameron , A , Cosentino , R , Dressing , C D , Dumusque , X , Figueira , P , Fiorenzano , A F M , García , R A , Handberg , R , Harutyunyan , A , Johnson , J A , Kjeldsen , H , Latham , D W , Lovis , C , Lundkvist , M S , Mathur , S , Mayor , M , Micela , G , Molinari , E , Motalebi , F , Nascimbeni , V , Nava , C , Pepe , F , Phillips , D F , Piotto , G , Poretti , E , Sasselov , D , Ségransan , D , Udry , S & Watson , C 2019 , ' A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system ' , Nature Astronomy , vol. 3 , pp. 416-423 .
dc.identifier.otherPURE: 258118526
dc.identifier.otherPURE UUID: 073a173f-082e-4b15-931d-e82ae7ae72d3
dc.identifier.otherBibCode: 2019NatAs.tmp..201B
dc.identifier.otherORCID: /0000-0002-8863-7828/work/58531460
dc.identifier.otherScopus: 85065653360
dc.identifier.otherWOS: 000467437500016
dc.descriptionFunding: European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement number 313014 (ETAEARTH).en
dc.description.abstractMeasures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii (R⊕) range from low-density sub-Neptunes containing volatile elements1 to higher-density rocky planets with Earth-like2 or iron-rich3 (Mercury-like) compositions. Such astonishing diversity in observed small exoplanet compositions may be the product ofdifferent initial conditions of the planet-formation process or different evolutionary paths that altered the planetary properties after formation4. Planet evolution may be especially affected by either photoevaporative mass loss induced by high stellar X-ray and extreme ultraviolet (XUV) flux5 or giant impacts6. Although there is some evidence for the former7,8, there are no unambiguous findings so far about the occurrence of giant impacts in an exoplanet system. Here, we characterize the two innermost planets ofthe compact and near-resonant system Kepler-107 (ref. 9). We show that they have nearly identical radii (about 1.5-1.6R⊕), but the outer planet Kepler-107 c is more than twice as dense (about 12.6 g cm-3) as the innermost Kepler-107 b (about 5.3 g cm-3). In consequence, Kepler-107 c must have a larger iron core fraction than Kepler-107 b. This imbalance cannot be explained by the stellar XUV irradiation, which would conversely make the more-irradiated and less-massive planet Kepler-107 b denser than Kepler-107 c. Instead, the dissimilar densities are consistent with a giant impact event on Kepler-107 c that would have stripped off part of its silicate mantle. This hypothesis is supported by theoretical predictions from collisional mantle stripping10, which match the mass and radius of Kepler-107 c.
dc.relation.ispartofNature Astronomyen
dc.rights© 2019, the Author(s), under exclusive licence to Springer Nature Limited. 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 as such may differ slightly from the final published version. The final published version of this work is available at
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleA giant impact as the likely origin of different twins in the Kepler-107 exoplanet systemen
dc.typeJournal articleen
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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