Discovery of a new AM CVn system with the Kepler satellite
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108973 |
Resumo: | We report the discovery of a new AM CVn system on the basis of broadband photometry obtained with the Kepler satellite supplemented by ground-based optical spectroscopy. Initially retained on Kepler target lists as a potential compact pulsator, the blue object SDSS J190817.07+394036.4 (KIC 004547333) has turned out to be a high-state AM CVn star showing the He-dominated spectrum of its accretion disk significantly reddened by interstellar absorption. We constructed new grids of NLTE synthetic spectra for accretion disks in order to analyze our spectroscopic observations. From this analysis, we infer preliminary estimates of the rate of mass transfer, the inclination angle of the disk, and the distance to the system. The AM CVn nature of the system is also evident in the Kepler light curve, from which we extracted 11 secure periodicities. The luminosity variations are dominated by a basic periodicity of 938.507 s, likely to correspond to a superhump modulation. The light curve folded on the period of 938.507 s exhibits a pulse shape that is very similar to the superhump wavefront seen in AM CVn itself, which is a high-state system and the prototype of the class. Our Fourier analysis also suggests the likely presence of a quasi-periodic oscillation similar to those already observed in some high-state AM CVn systems. Furthermore, some very low-frequency, low-amplitude aperiodic photometric activity is likely present, which is in line with what is expected in accreting binary systems. Inspired by previous work, we further looked for and found some intriguing numerical relationships between the 11 secure detected frequencies, in the sense that we can account for all of them in terms of only three basic clocks. This is further evidence in favor of the AM CVn nature of the system. |
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Fontaine, GillesBrassard, P.Green, Elisabeth M.Charpinet, StéphaneDufour, PatrickHubeny, IvanSteeghs, DannyAerts, ConnyRandall, S. K.Bergeron, PierreGuvenen, B.O'Malley, C. J.Van Grootel, ValérieOstensen, RoyBloemen, StevenSilvotti, RobertoHowell, SteveBaran, AndrzejKepler, Souza OliveiraMarsh, TomMontgomery, Michael HoustonOreiro, RaquelProvencal, Judith L.Telting, JohnWinget, Donald EarlZima, WolfgangChristensen-Dalsgaard, JorgenKjeldsen, Hans2015-01-15T02:15:10Z20110004-637Xhttp://hdl.handle.net/10183/108973000766681We report the discovery of a new AM CVn system on the basis of broadband photometry obtained with the Kepler satellite supplemented by ground-based optical spectroscopy. Initially retained on Kepler target lists as a potential compact pulsator, the blue object SDSS J190817.07+394036.4 (KIC 004547333) has turned out to be a high-state AM CVn star showing the He-dominated spectrum of its accretion disk significantly reddened by interstellar absorption. We constructed new grids of NLTE synthetic spectra for accretion disks in order to analyze our spectroscopic observations. From this analysis, we infer preliminary estimates of the rate of mass transfer, the inclination angle of the disk, and the distance to the system. The AM CVn nature of the system is also evident in the Kepler light curve, from which we extracted 11 secure periodicities. The luminosity variations are dominated by a basic periodicity of 938.507 s, likely to correspond to a superhump modulation. The light curve folded on the period of 938.507 s exhibits a pulse shape that is very similar to the superhump wavefront seen in AM CVn itself, which is a high-state system and the prototype of the class. Our Fourier analysis also suggests the likely presence of a quasi-periodic oscillation similar to those already observed in some high-state AM CVn systems. Furthermore, some very low-frequency, low-amplitude aperiodic photometric activity is likely present, which is in line with what is expected in accreting binary systems. Inspired by previous work, we further looked for and found some intriguing numerical relationships between the 11 secure detected frequencies, in the sense that we can account for all of them in terms of only three basic clocks. This is further evidence in favor of the AM CVn nature of the system.application/pdfengThe astrophysical journal. Bristol. Vol. 726, no. 2 (Jan. 2011), 92, 11 p.Discos de acrecaoAcreçãoAnãs brancasNucleo galaticoAccretion, accretion disksBinaries: closeStars: individual (SDSS J190817.07+394036.4, KIC 004547333)White dwarfsDiscovery of a new AM CVn system with the Kepler satelliteEstrangeiroinfo: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:UFRGSORIGINAL000766681.pdf000766681.pdfTexto completo (inglês)application/pdf932692http://www.lume.ufrgs.br/bitstream/10183/108973/1/000766681.pdf3c6804c12626fb6a427d6da3167c22f4MD51TEXT000766681.pdf.txt000766681.pdf.txtExtracted Texttext/plain63240http://www.lume.ufrgs.br/bitstream/10183/108973/2/000766681.pdf.txt8c42999240268f15ad0b5cc261588778MD52THUMBNAIL000766681.pdf.jpg000766681.pdf.jpgGenerated Thumbnailimage/jpeg2077http://www.lume.ufrgs.br/bitstream/10183/108973/3/000766681.pdf.jpg11f8530d58b1774a508a25301c9172f0MD5310183/1089732018-10-23 08:40:04.83oai:www.lume.ufrgs.br:10183/108973Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-23T11:40:04Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Discovery of a new AM CVn system with the Kepler satellite |
title |
Discovery of a new AM CVn system with the Kepler satellite |
spellingShingle |
Discovery of a new AM CVn system with the Kepler satellite Fontaine, Gilles Discos de acrecao Acreção Anãs brancas Nucleo galatico Accretion, accretion disks Binaries: close Stars: individual (SDSS J190817.07+394036.4, KIC 004547333) White dwarfs |
title_short |
Discovery of a new AM CVn system with the Kepler satellite |
title_full |
Discovery of a new AM CVn system with the Kepler satellite |
title_fullStr |
Discovery of a new AM CVn system with the Kepler satellite |
title_full_unstemmed |
Discovery of a new AM CVn system with the Kepler satellite |
title_sort |
Discovery of a new AM CVn system with the Kepler satellite |
author |
Fontaine, Gilles |
author_facet |
Fontaine, Gilles Brassard, P. Green, Elisabeth M. Charpinet, Stéphane Dufour, Patrick Hubeny, Ivan Steeghs, Danny Aerts, Conny Randall, S. K. Bergeron, Pierre Guvenen, B. O'Malley, C. J. Van Grootel, Valérie Ostensen, Roy Bloemen, Steven Silvotti, Roberto Howell, Steve Baran, Andrzej Kepler, Souza Oliveira Marsh, Tom Montgomery, Michael Houston Oreiro, Raquel Provencal, Judith L. Telting, John Winget, Donald Earl Zima, Wolfgang Christensen-Dalsgaard, Jorgen Kjeldsen, Hans |
author_role |
author |
author2 |
Brassard, P. Green, Elisabeth M. Charpinet, Stéphane Dufour, Patrick Hubeny, Ivan Steeghs, Danny Aerts, Conny Randall, S. K. Bergeron, Pierre Guvenen, B. O'Malley, C. J. Van Grootel, Valérie Ostensen, Roy Bloemen, Steven Silvotti, Roberto Howell, Steve Baran, Andrzej Kepler, Souza Oliveira Marsh, Tom Montgomery, Michael Houston Oreiro, Raquel Provencal, Judith L. Telting, John Winget, Donald Earl Zima, Wolfgang Christensen-Dalsgaard, Jorgen Kjeldsen, Hans |
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 |
dc.contributor.author.fl_str_mv |
Fontaine, Gilles Brassard, P. Green, Elisabeth M. Charpinet, Stéphane Dufour, Patrick Hubeny, Ivan Steeghs, Danny Aerts, Conny Randall, S. K. Bergeron, Pierre Guvenen, B. O'Malley, C. J. Van Grootel, Valérie Ostensen, Roy Bloemen, Steven Silvotti, Roberto Howell, Steve Baran, Andrzej Kepler, Souza Oliveira Marsh, Tom Montgomery, Michael Houston Oreiro, Raquel Provencal, Judith L. Telting, John Winget, Donald Earl Zima, Wolfgang Christensen-Dalsgaard, Jorgen Kjeldsen, Hans |
dc.subject.por.fl_str_mv |
Discos de acrecao Acreção Anãs brancas Nucleo galatico |
topic |
Discos de acrecao Acreção Anãs brancas Nucleo galatico Accretion, accretion disks Binaries: close Stars: individual (SDSS J190817.07+394036.4, KIC 004547333) White dwarfs |
dc.subject.eng.fl_str_mv |
Accretion, accretion disks Binaries: close Stars: individual (SDSS J190817.07+394036.4, KIC 004547333) White dwarfs |
description |
We report the discovery of a new AM CVn system on the basis of broadband photometry obtained with the Kepler satellite supplemented by ground-based optical spectroscopy. Initially retained on Kepler target lists as a potential compact pulsator, the blue object SDSS J190817.07+394036.4 (KIC 004547333) has turned out to be a high-state AM CVn star showing the He-dominated spectrum of its accretion disk significantly reddened by interstellar absorption. We constructed new grids of NLTE synthetic spectra for accretion disks in order to analyze our spectroscopic observations. From this analysis, we infer preliminary estimates of the rate of mass transfer, the inclination angle of the disk, and the distance to the system. The AM CVn nature of the system is also evident in the Kepler light curve, from which we extracted 11 secure periodicities. The luminosity variations are dominated by a basic periodicity of 938.507 s, likely to correspond to a superhump modulation. The light curve folded on the period of 938.507 s exhibits a pulse shape that is very similar to the superhump wavefront seen in AM CVn itself, which is a high-state system and the prototype of the class. Our Fourier analysis also suggests the likely presence of a quasi-periodic oscillation similar to those already observed in some high-state AM CVn systems. Furthermore, some very low-frequency, low-amplitude aperiodic photometric activity is likely present, which is in line with what is expected in accreting binary systems. Inspired by previous work, we further looked for and found some intriguing numerical relationships between the 11 secure detected frequencies, in the sense that we can account for all of them in terms of only three basic clocks. This is further evidence in favor of the AM CVn nature of the system. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011 |
dc.date.accessioned.fl_str_mv |
2015-01-15T02:15:10Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/108973 |
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0004-637X |
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000766681 |
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http://hdl.handle.net/10183/108973 |
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eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Bristol. Vol. 726, no. 2 (Jan. 2011), 92, 11 p. |
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