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Santerne, A.; Brugger, B.; Armstrong, D.J.; Adibekyan, V.; Lillo-Box, J.; Gosselin, H.; Aguichine, A.; Almenara, J.-M.; Barrado, D.; Barros, S.C.C.; Bayliss, D.; Boisse, I.; Bonomo, A.S.; Bouchy, F.; Brown, D.J.A.; Deleuil, M.; Delgado Mena, E.; Demangeon, O. (...) Vigan, A. "An Earth-sized exoplanet with a Mercury-like composition" (2018) Nature Astronomy. 2(5):393-400
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Abstract:

Earth, Venus, Mars and some extrasolar terrestrial planets 1 have a mass and radius that is consistent with a mass fraction of about 30% metallic core and 70% silicate mantle 2 . At the inner frontier of the Solar System, Mercury has a completely different composition, with a mass fraction of about 70% metallic core and 30% silicate mantle 3 . Several formation or evolution scenarios are proposed to explain this metal-rich composition, such as a giant impact 4 , mantle evaporation 5 or the depletion of silicate at the inner edge of the protoplanetary disk 6 . These scenarios are still strongly debated. Here, we report the discovery of a multiple transiting planetary system (K2-229) in which the inner planet has a radius of 1.165 ± 0.066 Earth radii and a mass of 2.59 ± 0.43 Earth masses. This Earth-sized planet thus has a core-mass fraction that is compatible with that of Mercury, although it was expected to be similar to that of Earth based on host-star chemistry 7 . This larger Mercury analogue either formed with a very peculiar composition or has evolved, for example, by losing part of its mantle. Further characterization of Mercury-like exoplanets such as K2-229 b will help to put the detailed in situ observations of Mercury (with MESSENGER and BepiColombo 8 ) into the global context of the formation and evolution of solar and extrasolar terrestrial planets. © 2018 The Author(s).

Registro:

Documento: Artículo
Título:An Earth-sized exoplanet with a Mercury-like composition
Autor:Santerne, A.; Brugger, B.; Armstrong, D.J.; Adibekyan, V.; Lillo-Box, J.; Gosselin, H.; Aguichine, A.; Almenara, J.-M.; Barrado, D.; Barros, S.C.C.; Bayliss, D.; Boisse, I.; Bonomo, A.S.; Bouchy, F.; Brown, D.J.A.; Deleuil, M.; Delgado Mena, E.; Demangeon, O.; Díaz, R.F.; Doyle, A.; Dumusque, X.; Faedi, F.; Faria, J.P.; Figueira, P.; Foxell, E.; Giles, H.; Hébrard, G.; Hojjatpanah, S.; Hobson, M.; Jackman, J.; King, G.; Kirk, J.; Lam, K.W.F.; Ligi, R.; Lovis, C.; Louden, T.; McCormac, J.; Mousis, O.; Neal, J.J.; Osborn, H.P.; Pepe, F.; Pollacco, D.; Santos, N.C.; Sousa, S.G.; Udry, S.; Vigan, A.
Filiación:Aix Marseille Univ., CNRS, LAM, Laboratoire d'Astrophysique de Marseille, Marseille, France
Department of Physics, University of Warwick, Coventry, United Kingdom
Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, CAUP, Porto, Portugal
European Southern Observatory (ESO), Santiago, Chile
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
Paris-Saclay Université, ENS Cachan, Cachan, France
Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Depto. de Astrofísica, Centro de Astrobiología (CSIC-INTA), Madrid, Spain
INAF - Osservatorio Astrofisico di Torino, Pino Torinese, Italy
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina
CONICET - Universidad de Buenos Aires, Instituto de Astronomía y Física Del Espacio (IAFE), Buenos Aires, Argentina
INAF - Osservatorio Atrofisico di Catania, Catania, Italy
Departamento de Física e Astronomia, Faculdade de Ciencias, Universidade Do Porto, Porto, Portugal
Institut d'Astrophysique de Paris, UMR7095 CNRS, Universite Pierre and Marie Curie, Paris, France
Aix Marseille Univ., CNRS, OHP, Observatoire de Haute Provence, Saint Michel l'Observatoire, France
Año:2018
Volumen:2
Número:5
Página de inicio:393
Página de fin:400
DOI: http://dx.doi.org/10.1038/s41550-018-0420-5
Título revista:Nature Astronomy
Título revista abreviado:Nat. Astron.
ISSN:23973366
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_23973366_v2_n5_p393_Santerne

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Citas:

---------- APA ----------
Santerne, A., Brugger, B., Armstrong, D.J., Adibekyan, V., Lillo-Box, J., Gosselin, H., Aguichine, A.,..., Vigan, A. (2018) . An Earth-sized exoplanet with a Mercury-like composition. Nature Astronomy, 2(5), 393-400.
http://dx.doi.org/10.1038/s41550-018-0420-5
---------- CHICAGO ----------
Santerne, A., Brugger, B., Armstrong, D.J., Adibekyan, V., Lillo-Box, J., Gosselin, H., et al. "An Earth-sized exoplanet with a Mercury-like composition" . Nature Astronomy 2, no. 5 (2018) : 393-400.
http://dx.doi.org/10.1038/s41550-018-0420-5
---------- MLA ----------
Santerne, A., Brugger, B., Armstrong, D.J., Adibekyan, V., Lillo-Box, J., Gosselin, H., et al. "An Earth-sized exoplanet with a Mercury-like composition" . Nature Astronomy, vol. 2, no. 5, 2018, pp. 393-400.
http://dx.doi.org/10.1038/s41550-018-0420-5
---------- VANCOUVER ----------
Santerne, A., Brugger, B., Armstrong, D.J., Adibekyan, V., Lillo-Box, J., Gosselin, H., et al. An Earth-sized exoplanet with a Mercury-like composition. Nat. Astron. 2018;2(5):393-400.
http://dx.doi.org/10.1038/s41550-018-0420-5