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dc.contributor.authorMa, Bopt_BR
dc.contributor.authorGe, Jianpt_BR
dc.contributor.authorBarnes, Rorypt_BR
dc.contributor.authorCrepp, Justin R.pt_BR
dc.contributor.authorDe Lee, Nathan M.pt_BR
dc.contributor.authorFerreira, Letícia D.pt_BR
dc.contributor.authorEsposito, Massimilianopt_BR
dc.contributor.authorFemenía Castellá, B.pt_BR
dc.contributor.authorFleming, S.W.pt_BR
dc.contributor.authorGaudi, B. S.pt_BR
dc.contributor.authorGhezzi, Luanpt_BR
dc.contributor.authorHebb, Lesliept_BR
dc.contributor.authorGonzález Hernández, Jonay I.pt_BR
dc.contributor.authorLee, Brian L.pt_BR
dc.contributor.authorMello, Gustavo Frederico Porto dept_BR
dc.contributor.authorStassun, Keivan G.pt_BR
dc.contributor.authorWang, Jipt_BR
dc.contributor.authorWisniewski, J.P.pt_BR
dc.contributor.authorAgol, Ericpt_BR
dc.contributor.authorBizyaev, D.pt_BR
dc.contributor.authorCargile, Phillip A.pt_BR
dc.contributor.authorChang, Liangpt_BR
dc.contributor.authorCosta, Luiz N. dapt_BR
dc.contributor.authorEastman, Jasonpt_BR
dc.contributor.authorGary, Bruce L.pt_BR
dc.contributor.authorJiang, Pengpt_BR
dc.contributor.authorKane, Stephen R.pt_BR
dc.contributor.authorLi, Ruipt_BR
dc.contributor.authorLiu, Jianpt_BR
dc.contributor.authorMahadevan, Suvrathpt_BR
dc.contributor.authorMaia, Marcio Antonio Geimbapt_BR
dc.contributor.authorMuna, Demitript_BR
dc.contributor.authorNguyen, D.C.pt_BR
dc.contributor.authorOgando, Ricardo L.C.pt_BR
dc.contributor.authorOravetz, Daniel J.pt_BR
dc.contributor.authorPepper, J.pt_BR
dc.contributor.authorPaegert, Martinpt_BR
dc.contributor.authorAllende Prieto, Carlospt_BR
dc.contributor.authorRebolo, Rafaelpt_BR
dc.contributor.authorSantiago, Basilio Xavierpt_BR
dc.contributor.authorSchneider, D.P.pt_BR
dc.contributor.authorBradley, Alaina C. Sheldenpt_BR
dc.contributor.authorSimmons, Audrey E.pt_BR
dc.contributor.authorSivarani, Thirupathipt_BR
dc.contributor.authorVan Eyken, Julian C.pt_BR
dc.contributor.authorWan, Xiaokept_BR
dc.contributor.authorWeaver, Benjamin A.pt_BR
dc.contributor.authorZhao, Bopt_BR
dc.date.accessioned2014-12-12T02:15:46Zpt_BR
dc.date.issued2013pt_BR
dc.identifier.issn0004-6256pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108145pt_BR
dc.description.abstractWe present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature Teff = 5903±42 K, surface gravity log(g) = 4.07±0.16 (cgs), and metallicity [Fe/H] = −0.23 ± 0.07. This candidate was discovered using data from the first two years of the Multi-object APO Radial Velocity Exoplanets Large-area Survey, which is part of the third phase of Sloan Digital Sky Survey. From our 38 radial velocity measurements spread over a two-year time baseline, we derive a Keplerian orbital fit with semi-amplitude K = 3.571 ± 0.041 km s−1, period P = 9.0090 ± 0.0004 days, and eccentricity e = 0.226±0.011. Adopting a mass of 1.16±0.11M for the subgiant host star, we infer that the companion has a minimum mass of 40.0 ± 2.5MJup. Assuming an edge-on orbit, the semimajor axis is 0.090 ± 0.003 AU. The host star is photometrically variable at the ∼1% level with a period of ∼13.16±0.01 days, indicating that the host star spin and companion orbit are not synchronized. Through adaptive optics imaging we also found a point source 643 ± 10 mas away from TYC 2087-00255-1, which would have a mass of 0.13M if it is physically associated with TYC 2087-00255-1 and has the same age. Future proper motion observation should be able to resolve if this tertiary object is physically associated with TYC 2087-00255-1 and make TYC 2087-00255-1 a triple body system. Core Ca ii H and K line emission indicate that the host is chromospherically active, at a level that is consistent with the inferred spin period and measured vrot sin i, but unusual for a subgiant of this Teff . This activity could be explained by ongoing tidal spin-up of the host star by the companion.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofThe Astronomical journal. Vol. 145, no. 1 (Jan. 2013), 20, 15 p.pt_BR
dc.rightsOpen Accessen
dc.subjectBrown dwarfsen
dc.subjectMassa estelarpt_BR
dc.subjectMovimento estelarpt_BR
dc.subjectStars: low-massen
dc.subjectAnãs marronspt_BR
dc.subjectTechniques: radial velocitiesen
dc.titleVery-low-mass stellar and substellar companion to solar-like stars from MARVELS. III. A short-period brown dwarf cadidate around an active G0IV subgiantpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000871368pt_BR
dc.type.originEstrangeiropt_BR


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