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dc.contributor.authorMack, C. E.pt_BR
dc.contributor.authorGe, Jianpt_BR
dc.contributor.authorDeshpande, Rohitpt_BR
dc.contributor.authorWisniewski, J.P.pt_BR
dc.contributor.authorStassun, Keivan G.pt_BR
dc.contributor.authorGaudi, B. S.pt_BR
dc.contributor.authorFleming, S.W.pt_BR
dc.contributor.authorMahadevan, Suvrathpt_BR
dc.contributor.authorDe Lee, Nathan M.pt_BR
dc.contributor.authorEastman, Jasonpt_BR
dc.contributor.authorGhezzi, Luanpt_BR
dc.contributor.authorGonzález Hernández, Jonay I.pt_BR
dc.contributor.authorFemenía Castellá, B.pt_BR
dc.contributor.authorFerreira, Letícia D.pt_BR
dc.contributor.authorMello, Gustavo Frederico Porto dept_BR
dc.contributor.authorCrepp, Justin R.pt_BR
dc.contributor.authorMata Sánchez, Danielpt_BR
dc.contributor.authorAgol, Ericpt_BR
dc.contributor.authorBeatty, Thomas G.pt_BR
dc.contributor.authorBizyaev, D.pt_BR
dc.contributor.authorBrewington, Howard J.pt_BR
dc.contributor.authorCargile, Phillip A.pt_BR
dc.contributor.authorCosta, Luiz N. dapt_BR
dc.contributor.authorEsposito, Massimilianopt_BR
dc.contributor.authorEbelke, Garrett L.pt_BR
dc.contributor.authorHebb, Lesliept_BR
dc.contributor.authorJiang, Pengpt_BR
dc.contributor.authorKane, Stephen R.pt_BR
dc.contributor.authorLee, Brian L.pt_BR
dc.contributor.authorMaia, Marcio Antonio Geimbapt_BR
dc.contributor.authorMalanushenko, E.pt_BR
dc.contributor.authorMalanushenko, V.pt_BR
dc.contributor.authorOravetz, Daniel J.pt_BR
dc.contributor.authorPaegert, Martinpt_BR
dc.contributor.authorPan, K.pt_BR
dc.contributor.authorAllende Prieto, Carlospt_BR
dc.contributor.authorPepper, J.pt_BR
dc.contributor.authorRebolo, Rafaelpt_BR
dc.contributor.authorRoy, Arpitapt_BR
dc.contributor.authorSantiago, Basilio Xavierpt_BR
dc.contributor.authorSchneider, D.P.pt_BR
dc.contributor.authorSimmons, Audrey E.pt_BR
dc.contributor.authorSiverd, Robert J.pt_BR
dc.contributor.authorSnedden, S.A.pt_BR
dc.contributor.authorTofflemire, Benjamin M.pt_BR
dc.date.accessioned2014-12-12T02:15:55Zpt_BR
dc.date.issued2013pt_BR
dc.identifier.issn0004-6256pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108159pt_BR
dc.description.abstractWe report the discovery of a highly eccentric, double-lined spectroscopic binary star system (TYC 3010-1494-1), comprising two solar-type stars that we had initially identified as a single star with a brown dwarf companion. At the moderate resolving power of the MARVELS spectrograph and the spectrographs used for subsequent radialvelocity (RV) measurements (R 30,000), this particular stellar binary mimics a single-lined binary with an RV signal that would be induced by a brown dwarf companion (M sin i ∼ 50MJup) to a solar-type primary. At least three properties of this system allow it to masquerade as a single star with a very-low-mass companion: its large eccentricity (e ∼ 0.8), its relatively long period (P ∼ 238 days), and the approximately perpendicular orientation of the semi-major axis with respect to the line of sight (ω ∼ 189◦). As a result of these properties, for ∼95% of the orbit the two sets of stellar spectral lines are completely blended, and the RV measurements based on centroiding on the apparently single-lined spectrum is very well fit by an orbit solution indicative of a brown dwarf companion on a more circular orbit (e ∼ 0.3). Only during the ∼5% of the orbit near periastron passage does the true, double-lined nature and large RV amplitude of ∼15 km s−1 reveal itself. The discovery of this binary system is an important lesson for RV surveys searching for substellar companions; at a given resolution and observing cadence, a survey will be susceptible to these kinds of astrophysical false positives for a range of orbital parameters. Finally, for surveys like MARVELS that lack the resolution for a useful line bisector analysis, it is imperative to monitor the peak of the cross-correlation function for suspicious changes in width or shape, so that such false positives can be flagged during the candidate vetting process.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe Astronomical journal. Vol. 145, no. 5 (May 2013), 139, 15 p.pt_BR
dc.rightsOpen Accessen
dc.subjectEstrelas binariaspt_BR
dc.subjectBinaries: spectroscopicen
dc.subjectBrown dwarfsen
dc.subjectAnãs marronspt_BR
dc.subjectStars: individual (TYC 3010-1494-1)en
dc.titleA cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binarypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000900798pt_BR
dc.type.originEstrangeiropt_BR


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