A planet around the evolved intermediate-mass star HD 110014

Context. We found evidence for a sub–stellar companion around the K giant star HD 110014. This cool evolved star, with a spectral type K2III and an estimated mass between 1.9 and 2.4 M, is slightly metal rich with [Fe/H] = 0.19 and a rotational velocity V sin i = 2.0 km s−1. Aims. To search for extr...

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Principais autores: Medeiros, José Renan de, Setiawan, J., Hatzes, A. P., Pasquini, L., Girardi, L., Udry, S., Döllinger, M. P., Silva, L. da
Formato: article
Idioma:English
Publicado em: Astronomy & Astrophysics
Assuntos:
Stars: evolution
Technique: radial velocities
Stars: planetary systems
Stars late-type
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/28995
https://doi.org/10.1051/0004-6361/200911658
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spelling ri-123456789-289952020-05-24T09:21:04Z A planet around the evolved intermediate-mass star HD 110014 Medeiros, José Renan de Setiawan, J. Hatzes, A. P. Pasquini, L. Girardi, L. Udry, S. Döllinger, M. P. Silva, L. da Stars: evolution Technique: radial velocities Stars: planetary systems Stars late-type Context. We found evidence for a sub–stellar companion around the K giant star HD 110014. This cool evolved star, with a spectral type K2III and an estimated mass between 1.9 and 2.4 M, is slightly metal rich with [Fe/H] = 0.19 and a rotational velocity V sin i = 2.0 km s−1. Aims. To search for extrasolar planets around intermediate-mass stars and to improve our knowledge of the nature of radial velocity variations shown by G and K giant stars. Methods. Based on radial velocity analysis, we found evidence for a substellar companion with a planetary mass and long orbital period. The Radial velocity variation of HD 110014 has been monitored from 2000 until 2007 with FEROS at 1.5 m ESO and at the 2.2 m MPG/ESO, HARPS at the 3.6 m ESO and Coralie at 1.2 m Leonard Euler swiss telescopes in La Silla observatory. The radial velocities were computed by using a cross-correlation technique. Line bisector, Hipparcos photometry and chromospheric lines were analyzed to exclude other root-causes for the radial velocity variability. Results. We report the presence of an extrasolar planet around the giant star HD 110014, with an orbital period of 835.48±6.04 days. A Keplerian orbit, with an eccentricity e = 0.462 ± 0.069, yields a minimum mass M sin i = 11.09 MJup. The analysis of the residuals shows evidence for a second RV variability with a period of 130 days and an amplitude of ±100 ms−1. Its nature is not completely clear, but a second planet is a possible explanation. 2020-05-18T18:14:53Z 2020-05-18T18:14:53Z 2009-07-15 article Medeiros, José Renan de et al. A planet around the evolved intermediate-mass star HD 110014. Astronomy & Astrophysics (Berlin. Print), v. 504, p. 617-623, 2009. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200911658. Disponível em:https://www.aanda.org/articles/aa/abs/2009/35/aa11658-09/aa11658-09.html. Acesso em: 18 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO. 0004-6361 (print), 1432-0746 (online) https://repositorio.ufrn.br/jspui/handle/123456789/28995 https://doi.org/10.1051/0004-6361/200911658 en application/pdf Astronomy & Astrophysics
institution Repositório Institucional
collection RI - UFRN
language English
topic Stars: evolution
Technique: radial velocities
Stars: planetary systems
Stars late-type
spellingShingle Stars: evolution
Technique: radial velocities
Stars: planetary systems
Stars late-type
Medeiros, José Renan de
Setiawan, J.
Hatzes, A. P.
Pasquini, L.
Girardi, L.
Udry, S.
Döllinger, M. P.
Silva, L. da
A planet around the evolved intermediate-mass star HD 110014
description Context. We found evidence for a sub–stellar companion around the K giant star HD 110014. This cool evolved star, with a spectral type K2III and an estimated mass between 1.9 and 2.4 M, is slightly metal rich with [Fe/H] = 0.19 and a rotational velocity V sin i = 2.0 km s−1. Aims. To search for extrasolar planets around intermediate-mass stars and to improve our knowledge of the nature of radial velocity variations shown by G and K giant stars. Methods. Based on radial velocity analysis, we found evidence for a substellar companion with a planetary mass and long orbital period. The Radial velocity variation of HD 110014 has been monitored from 2000 until 2007 with FEROS at 1.5 m ESO and at the 2.2 m MPG/ESO, HARPS at the 3.6 m ESO and Coralie at 1.2 m Leonard Euler swiss telescopes in La Silla observatory. The radial velocities were computed by using a cross-correlation technique. Line bisector, Hipparcos photometry and chromospheric lines were analyzed to exclude other root-causes for the radial velocity variability. Results. We report the presence of an extrasolar planet around the giant star HD 110014, with an orbital period of 835.48±6.04 days. A Keplerian orbit, with an eccentricity e = 0.462 ± 0.069, yields a minimum mass M sin i = 11.09 MJup. The analysis of the residuals shows evidence for a second RV variability with a period of 130 days and an amplitude of ±100 ms−1. Its nature is not completely clear, but a second planet is a possible explanation.
format article
author Medeiros, José Renan de
Setiawan, J.
Hatzes, A. P.
Pasquini, L.
Girardi, L.
Udry, S.
Döllinger, M. P.
Silva, L. da
author_facet Medeiros, José Renan de
Setiawan, J.
Hatzes, A. P.
Pasquini, L.
Girardi, L.
Udry, S.
Döllinger, M. P.
Silva, L. da
author_sort Medeiros, José Renan de
title A planet around the evolved intermediate-mass star HD 110014
title_short A planet around the evolved intermediate-mass star HD 110014
title_full A planet around the evolved intermediate-mass star HD 110014
title_fullStr A planet around the evolved intermediate-mass star HD 110014
title_full_unstemmed A planet around the evolved intermediate-mass star HD 110014
title_sort planet around the evolved intermediate-mass star hd 110014
publisher Astronomy & Astrophysics
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/28995
https://doi.org/10.1051/0004-6361/200911658
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