Artículo
K2-110 b: A massive mini-Neptune exoplanet
Osborn, 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.; Diaz, Rodrigo Fernando
; 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.
Fecha de publicación:
08/2017
Editorial:
EDP Sciences
Revista:
Astronomy and Astrophysics
ISSN:
0004-6361
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We 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 a mass 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 likelydisc-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%.
Palabras clave:
Planets And Satellites: Detection
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Identificadores
Colecciones
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Osborn, H. P.; Santerne, A.; Barros, S. C. C.; Santos, N. C.; Dumusque, X.; et al.; K2-110 b: A massive mini-Neptune exoplanet; EDP Sciences; Astronomy and Astrophysics; 604; A19; 8-2017; 1-8
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