Discovery of a new AM CVn system with the Kepler satellite

Detalhes bibliográficos
Autor(a) principal: Fontaine, Gilles
Data de Publicação: 2011
Outros Autores: 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
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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spelling 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
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/108973
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dc.language.iso.fl_str_mv eng
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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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