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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. (...) Walker, S.R. "K2-110 b: A massive mini-Neptune exoplanet" (2017) Astronomy and Astrophysics. 604
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Abstract:

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 H 2 atmosphere puzzling. This analysis has made K2-110 b one of the best-characterised mini-Neptunes with density constrained to less than 30%. © 2017 ESO.

Registro:

Documento: Artículo
Título:K2-110 b: A massive mini-Neptune exoplanet
Autor: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.; DIáz, R.F.; 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.
Filiación:Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, CAUP, rua das Estrelas, Porto, 4150-762, Portugal
Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, UMR 7326, Marseille, 13388, France
Departamento de Física e Astronomia, Universidade Do Porto, rua Campo Alegre, Porto, 4169-007, Portugal
Observatoire Astronomique de l'Université de Genève, 51 Chemin des Maillettes, Versoix, 1290, Switzerland
Dipartimento di Fisica e Astronomia Galileo Galilei, Universita' di Padova, Vicolo dell'Osservatorio 3, Padova, 35122, Italy
INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, Padova, 35122, Italy
ARC, School of Mathematics and Physics, Queen's University Belfast, University Road, Belfast, BT7 1NN, United Kingdom
Department of Physics, University of Zanjan, University Blvd, Zanjan, 45371-38791, Iran
Université Grenoble Alpes, IPAG, Grenoble, 38000, France
CNRS, IPAG, Grenoble, 38000, France
School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews Fife, KY16 9SS, United Kingdom
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina
CONICET-Universidad de Buenos Aires, Instituto de Astronomiá y Física Del Espacio (IAFE), Buenos Aires, Argentina
Institut d'Astrophysique de Paris, UMR 7095 CNRS, Université Pierre and Marie Curie, 98bis boulevard Arago, Paris, 75014, France
Observatoire de Haute-Provence, Université d'Aix-Marseille, CNRS, Saint Michel l' Observatoire, 04870, France
European Southern Observatory (ESO), Alonso de Cordova 3107, Santiago de Chile, 19001, Chile
INAF-Fundación Galileo Galilei, Rambla José Ana Fernandez Pérez 7, Bernã Baja, 38712, Spain
INAF, IASF Milano, via Bassini 15, Milano, 20133, Italy
Palabras clave:Planets and satellites: Detection; Earth (planet); Earth atmosphere; Extrasolar planets; Photometry; Planets; Satellites; Stars; Dwarf stars; Exoplanet; Follow up; H2 atmosphere; High-precision; Hydrogen atmosphere; Joint analysis; Planets and satellites: detections; Orbits
Año:2017
Volumen:604
DOI: http://dx.doi.org/10.1051/0004-6361/201628932
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v604_n_p_Osborn

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Citas:

---------- APA ----------
Osborn, H.P., Santerne, A., Barros, S.C.C., Santos, N.C., Dumusque, X., Malavolta, L., Armstrong, D.J.,..., Walker, S.R. (2017) . K2-110 b: A massive mini-Neptune exoplanet. Astronomy and Astrophysics, 604.
http://dx.doi.org/10.1051/0004-6361/201628932
---------- CHICAGO ----------
Osborn, H.P., Santerne, A., Barros, S.C.C., Santos, N.C., Dumusque, X., Malavolta, L., et al. "K2-110 b: A massive mini-Neptune exoplanet" . Astronomy and Astrophysics 604 (2017).
http://dx.doi.org/10.1051/0004-6361/201628932
---------- MLA ----------
Osborn, H.P., Santerne, A., Barros, S.C.C., Santos, N.C., Dumusque, X., Malavolta, L., et al. "K2-110 b: A massive mini-Neptune exoplanet" . Astronomy and Astrophysics, vol. 604, 2017.
http://dx.doi.org/10.1051/0004-6361/201628932
---------- VANCOUVER ----------
Osborn, H.P., Santerne, A., Barros, S.C.C., Santos, N.C., Dumusque, X., Malavolta, L., et al. K2-110 b: A massive mini-Neptune exoplanet. Astron. Astrophys. 2017;604.
http://dx.doi.org/10.1051/0004-6361/201628932