K2-110 b: A massive mini-Neptune exoplanet

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-precisi...

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Publicado: 2017
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Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v604_n_p_Osborn
http://hdl.handle.net/20.500.12110/paper_00046361_v604_n_p_Osborn
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spelling paper:paper_00046361_v604_n_p_Osborn2023-06-08T14:28:21Z K2-110 b: A massive mini-Neptune exoplanet 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 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. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v604_n_p_Osborn http://hdl.handle.net/20.500.12110/paper_00046361_v604_n_p_Osborn
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
K2-110 b: A massive mini-Neptune exoplanet
topic_facet 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
description 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.
title K2-110 b: A massive mini-Neptune exoplanet
title_short K2-110 b: A massive mini-Neptune exoplanet
title_full K2-110 b: A massive mini-Neptune exoplanet
title_fullStr K2-110 b: A massive mini-Neptune exoplanet
title_full_unstemmed K2-110 b: A massive mini-Neptune exoplanet
title_sort k2-110 b: a massive mini-neptune exoplanet
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v604_n_p_Osborn
http://hdl.handle.net/20.500.12110/paper_00046361_v604_n_p_Osborn
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