A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108159 |
Resumo: | We 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. |
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Mack, C. E.Ge, JianDeshpande, RohitWisniewski, J.P.Stassun, Keivan G.Gaudi, B. S.Fleming, S.W.Mahadevan, SuvrathDe Lee, Nathan M.Eastman, JasonGhezzi, LuanGonzález Hernández, Jonay I.Femenía Castellá, B.Ferreira, Letícia D.Mello, Gustavo Frederico Porto deCrepp, Justin R.Mata Sánchez, DanielAgol, EricBeatty, Thomas G.Bizyaev, D.Brewington, Howard J.Cargile, Phillip A.Costa, Luiz N. daEsposito, MassimilianoEbelke, Garrett L.Hebb, LeslieJiang, PengKane, Stephen R.Lee, Brian L.Maia, Marcio Antonio GeimbaMalanushenko, E.Malanushenko, V.Oravetz, Daniel J.Paegert, MartinPan, K.Allende Prieto, CarlosPepper, J.Rebolo, RafaelRoy, ArpitaSantiago, Basilio XavierSchneider, D.P.Simmons, Audrey E.Siverd, Robert J.Snedden, S.A.Tofflemire, Benjamin M.2014-12-12T02:15:55Z20130004-6256http://hdl.handle.net/10183/108159000900798We 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.application/pdfengThe Astronomical journal. Vol. 145, no. 5 (May 2013), 139, 15 p.Estrelas binariasAnãs marronsBinaries: spectroscopicBrown dwarfsStars: individual (TYC 3010-1494-1)A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binaryEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000900798.pdf000900798.pdfTexto completo (inglês)application/pdf1181958http://www.lume.ufrgs.br/bitstream/10183/108159/1/000900798.pdf64b62db53e790152a111123a7ae6bf54MD51TEXT000900798.pdf.txt000900798.pdf.txtExtracted Texttext/plain79713http://www.lume.ufrgs.br/bitstream/10183/108159/2/000900798.pdf.txtc82ec1a77dee39579e407cb7a27bf56bMD52THUMBNAIL000900798.pdf.jpg000900798.pdf.jpgGenerated Thumbnailimage/jpeg2027http://www.lume.ufrgs.br/bitstream/10183/108159/3/000900798.pdf.jpg2b2ef7e96b27ac868def202ce9f8019aMD5310183/1081592023-07-05 03:48:06.098694oai:www.lume.ufrgs.br:10183/108159Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-05T06:48:06Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
title |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
spellingShingle |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary Mack, C. E. Estrelas binarias Anãs marrons Binaries: spectroscopic Brown dwarfs Stars: individual (TYC 3010-1494-1) |
title_short |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
title_full |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
title_fullStr |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
title_full_unstemmed |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
title_sort |
A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary |
author |
Mack, C. E. |
author_facet |
Mack, C. E. Ge, Jian Deshpande, Rohit Wisniewski, J.P. Stassun, Keivan G. Gaudi, B. S. Fleming, S.W. Mahadevan, Suvrath De Lee, Nathan M. Eastman, Jason Ghezzi, Luan González Hernández, Jonay I. Femenía Castellá, B. Ferreira, Letícia D. Mello, Gustavo Frederico Porto de Crepp, Justin R. Mata Sánchez, Daniel Agol, Eric Beatty, Thomas G. Bizyaev, D. Brewington, Howard J. Cargile, Phillip A. Costa, Luiz N. da Esposito, Massimiliano Ebelke, Garrett L. Hebb, Leslie Jiang, Peng Kane, Stephen R. Lee, Brian L. Maia, Marcio Antonio Geimba Malanushenko, E. Malanushenko, V. Oravetz, Daniel J. Paegert, Martin Pan, K. Allende Prieto, Carlos Pepper, J. Rebolo, Rafael Roy, Arpita Santiago, Basilio Xavier Schneider, D.P. Simmons, Audrey E. Siverd, Robert J. Snedden, S.A. Tofflemire, Benjamin M. |
author_role |
author |
author2 |
Ge, Jian Deshpande, Rohit Wisniewski, J.P. Stassun, Keivan G. Gaudi, B. S. Fleming, S.W. Mahadevan, Suvrath De Lee, Nathan M. Eastman, Jason Ghezzi, Luan González Hernández, Jonay I. Femenía Castellá, B. Ferreira, Letícia D. Mello, Gustavo Frederico Porto de Crepp, Justin R. Mata Sánchez, Daniel Agol, Eric Beatty, Thomas G. Bizyaev, D. Brewington, Howard J. Cargile, Phillip A. Costa, Luiz N. da Esposito, Massimiliano Ebelke, Garrett L. Hebb, Leslie Jiang, Peng Kane, Stephen R. Lee, Brian L. Maia, Marcio Antonio Geimba Malanushenko, E. Malanushenko, V. Oravetz, Daniel J. Paegert, Martin Pan, K. Allende Prieto, Carlos Pepper, J. Rebolo, Rafael Roy, Arpita Santiago, Basilio Xavier Schneider, D.P. Simmons, Audrey E. Siverd, Robert J. Snedden, S.A. Tofflemire, Benjamin M. |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Mack, C. E. Ge, Jian Deshpande, Rohit Wisniewski, J.P. Stassun, Keivan G. Gaudi, B. S. Fleming, S.W. Mahadevan, Suvrath De Lee, Nathan M. Eastman, Jason Ghezzi, Luan González Hernández, Jonay I. Femenía Castellá, B. Ferreira, Letícia D. Mello, Gustavo Frederico Porto de Crepp, Justin R. Mata Sánchez, Daniel Agol, Eric Beatty, Thomas G. Bizyaev, D. Brewington, Howard J. Cargile, Phillip A. Costa, Luiz N. da Esposito, Massimiliano Ebelke, Garrett L. Hebb, Leslie Jiang, Peng Kane, Stephen R. Lee, Brian L. Maia, Marcio Antonio Geimba Malanushenko, E. Malanushenko, V. Oravetz, Daniel J. Paegert, Martin Pan, K. Allende Prieto, Carlos Pepper, J. Rebolo, Rafael Roy, Arpita Santiago, Basilio Xavier Schneider, D.P. Simmons, Audrey E. Siverd, Robert J. Snedden, S.A. Tofflemire, Benjamin M. |
dc.subject.por.fl_str_mv |
Estrelas binarias Anãs marrons |
topic |
Estrelas binarias Anãs marrons Binaries: spectroscopic Brown dwarfs Stars: individual (TYC 3010-1494-1) |
dc.subject.eng.fl_str_mv |
Binaries: spectroscopic Brown dwarfs Stars: individual (TYC 3010-1494-1) |
description |
We 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. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013 |
dc.date.accessioned.fl_str_mv |
2014-12-12T02:15:55Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/108159 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-6256 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000900798 |
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0004-6256 000900798 |
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http://hdl.handle.net/10183/108159 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The Astronomical journal. Vol. 145, no. 5 (May 2013), 139, 15 p. |
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openAccess |
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