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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Autores principales:	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.
Formato:	JOUR
Materias:	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
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v604_n_p_Osborn
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v604_n_p_Osborn
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spelling	todo:paper_00046361_v604_n_p_Osborn2023-10-03T14:01:12Z 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. 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. 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 âŠ• and a mass of 16.7 ± 3.2M âŠ• , 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 âŠ• hydrogen atmosphere over an 16.5M âŠ• 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 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. 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 âŠ• and a mass of 16.7 ± 3.2M âŠ• , 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 âŠ• hydrogen atmosphere over an 16.5M âŠ• 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.
format	JOUR
author	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.
author_facet	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.
author_sort	Osborn, H.P.
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
url	http://hdl.handle.net/20.500.12110/paper_00046361_v604_n_p_Osborn
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K2-110 b: A massive mini-Neptune exoplanet

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