Mostrar el registro sencillo del ítem
Lithium in the Hyades L5 brown dwarf 2MASS J04183483+2131275
dc.contributor.author | Lodieu, N. | |
dc.contributor.author | Rebolo López, Rafael | |
dc.contributor.author | Pérez Garrido, Antonio | |
dc.coverage.spatial | east=-16.30809290000002; north=28.4746232; name=Calle Orion, 14, 38205 San Cristóbal de La Laguna, Santa Cruz de Tenerife, España | es_ES |
dc.date.accessioned | 2019-05-09T12:28:16Z | |
dc.date.available | 2019-05-09T12:28:16Z | |
dc.date.issued | 2018-07-20 | |
dc.identifier.citation | N. Lodieu, R. Rebolo, A. Pérez-Garrido. Lithium in the Hyades L5 brown dwarf 2MASS J04183483+2131275. En A&A. 615, L12, (2018). DOI: 10.1051/0004-6361/201832748 | es_ES |
dc.identifier.issn | 0004-6361 | |
dc.description.abstract | Aims. From the luminosity, effective temperature and age of the Hyades brown dwarf 2MASS J04183483+2131275 (2M0418), substellar evolutionary models predict a mass in the range 39−55 Jupiter masses (MJup) which is insufficient to produce any substantial lithium burning except for the very upper range >53 MJup. Our goal is to measure the abundance of lithium in this object, test the consistency between models and observations and refine constraints on the mass and age of the object. Methods. We used the 10.4-m Gran Telescopio Canarias (GTC) with its low-dispersion optical spectrograph to obtain ten spectra of 2277 s each covering the range 6300–10 300 Å with a resolving power of R ~ 500. Results. In the individual spectra, which span several months, we detect persistent unresolved Hα in emission with pseudo equivalent widths (pEW) in the range 45–150 Å and absorption lines of various alkalis with the typical strengths found in objects of L5 spectral type. The lithium resonance line at 6707.8 Å is detected with pEW of 18 ± 4 Å in 2M0418 (L5). Conclusions. We determine a lithium abundance of log N(Li) = 3.0 ± 0.4 dex consistent with a minimum preservation of 90% of this element which confirms 2M0418 as a brown dwarf with a maximum mass of 52 MJup. We infer a maximum age for the Hyades of 775 Myr from a comparison with the BHAC15 models. Combining recent results from the literature with our study, we constrain the mass of 2M0418 to 45–52 MJup and the age of the cluster to 580–775 Myr (1σ) based on the lithium depletion boundary method. | es_ES |
dc.description.sponsorship | We thank the referee for a detailed report that improved the quality of this manuscript. This research has been supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under the grants AYA2015- 69350-C3-2-P and AYA2015-69350-C3-3-P. We thank Yakiv Pavlenko for his calculations of equivalent widths at different temperatures, Isabelle Baraffe for her models, and Eduardo Martín for sharing his results prior to publication. This work is based on observations made with the Gran Telescopio Canarias (GTC), operated on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias (programme GTC77- 16B led by Pérez Garrido). This research has made use of the Simbad and Vizier databases, operated at the Centre de Données Astronomiques de Strasbourg (CDS), and of NASA’s Astrophysics Data System Bibliographic Services (ADS). We thank John Stauffer for kindly providing the optical spectra of the K and M Hyades members published in 1997 (Stauffer et al. 1997a). | es_ES |
dc.format | application/pdf | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | EDP Sciences | es_ES |
dc.relation.uri | https://www.aanda.org/articles/aa/abs/2018/07/aa32748-18/aa32748-18.html | es_ES |
dc.rights | Atribución-NoComercial-SinDerivadas 3.0 España | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ | * |
dc.title | Lithium in the Hyades L5 brown dwarf 2MASS J04183483+2131275 | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.subject.other | Física Aplicada | es_ES |
dc.subject | Stars | es_ES |
dc.subject | Hyades | es_ES |
dc.subject | Photometric | es_ES |
dc.subject | Spectroscopic | es_ES |
dc.identifier.uri | http://hdl.handle.net/10317/7762 | |
dc.peerreview | Si | es_ES |
dc.identifier.doi | 10.1051/0004-6361/201832748 | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es_ES |
dc.type.version | info:eu-repo/semantics/publishedVersion | es_ES |
dc.subject.unesco | 21 Astronomía y Astrofísica | es_ES |
dc.contributor.funder | Ministerio de Economía, Industria y Competitividad | es_ES |
Ficheros en el ítem
Este ítem aparece en la(s) siguiente(s) colección(ones)
-
Artículos [1754]
Redes sociales