The frequency of gaseous debris discs around white dwarfs
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/212350 |
Resumo: | A total of 1–3 per cent of white dwarfs are orbited by planetary dusty debris detectable as infrared emission in excess above the white dwarf flux. In a rare subset of these systems, a gaseous disc component is also detected via emission lines of the Ca ii 8600 Å triplet, broadened by the Keplerian velocity of the disc. We present the first statistical study of the fraction of debris discs containing detectable amounts of gas in emission at white dwarfs within a magnitude and signal-to-noise ratio limited sample. We select 7705 single white dwarfs spectroscopically observed by the Sloan Digital Sky Survey (SDSS) and Gaia with magnitudes g ≤ 19. We identify five gaseous disc hosts, all of which have been previously discovered. We calculate the occurrence rate of a white dwarf hosting a debris disc detectable via Ca ii emission lines as 0.067±0.0420.025 per cent. This corresponds to an occurrence rate for a dusty debris disc to have an observable gaseous component in emission as 4 ± 42 per cent. Given that variability is a common feature of the emission profiles of gaseous debris discs, and the recent detection of a planetesimal orbiting within the disc of SDSS J122859.93+104032.9, we propose that gaseous components are tracers for the presence of planetesimals embedded in the discs and outline a qualitative model. We also present spectroscopy of the Ca ii triplet 8600 Å region for 20 white dwarfs hosting dusty debris discs in an attempt to identify gaseous emission. We do not detect any gaseous components in these 20 systems, consistent with the occurrence rate that we calculated. |
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Manser, ChristopherGänsicke, BorisFusillo, Nicola Pietro GentileAshley, Richard P.Breedt, ElméHollands, MarkIzquierdo, PaulaPelisoli, Ingrid Domingos2020-07-23T03:40:37Z20200035-8711http://hdl.handle.net/10183/212350001114937A total of 1–3 per cent of white dwarfs are orbited by planetary dusty debris detectable as infrared emission in excess above the white dwarf flux. In a rare subset of these systems, a gaseous disc component is also detected via emission lines of the Ca ii 8600 Å triplet, broadened by the Keplerian velocity of the disc. We present the first statistical study of the fraction of debris discs containing detectable amounts of gas in emission at white dwarfs within a magnitude and signal-to-noise ratio limited sample. We select 7705 single white dwarfs spectroscopically observed by the Sloan Digital Sky Survey (SDSS) and Gaia with magnitudes g ≤ 19. We identify five gaseous disc hosts, all of which have been previously discovered. We calculate the occurrence rate of a white dwarf hosting a debris disc detectable via Ca ii emission lines as 0.067±0.0420.025 per cent. This corresponds to an occurrence rate for a dusty debris disc to have an observable gaseous component in emission as 4 ± 42 per cent. Given that variability is a common feature of the emission profiles of gaseous debris discs, and the recent detection of a planetesimal orbiting within the disc of SDSS J122859.93+104032.9, we propose that gaseous components are tracers for the presence of planetesimals embedded in the discs and outline a qualitative model. We also present spectroscopy of the Ca ii triplet 8600 Å region for 20 white dwarfs hosting dusty debris discs in an attempt to identify gaseous emission. We do not detect any gaseous components in these 20 systems, consistent with the occurrence rate that we calculated.application/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 493, no. 2 (Apr. 2020), p. 2127–2139Anãs brancasPoeira cosmicaAccretion, accretion discsLine: profilesCircumstellar matterWhite dwarfsThe frequency of gaseous debris discs around white dwarfsEstrangeiroinfo: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:UFRGSTEXT001114937.pdf.txt001114937.pdf.txtExtracted Texttext/plain51043http://www.lume.ufrgs.br/bitstream/10183/212350/2/001114937.pdf.txt30905f93fc635a7f80f3faf41c27af80MD52ORIGINAL001114937.pdfTexto completo (inglês)application/pdf1335229http://www.lume.ufrgs.br/bitstream/10183/212350/1/001114937.pdf908ce5b6d05c27d913c701a5baa40a1aMD5110183/2123502020-07-24 03:39:53.617316oai:www.lume.ufrgs.br:10183/212350Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2020-07-24T06:39:53Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The frequency of gaseous debris discs around white dwarfs |
title |
The frequency of gaseous debris discs around white dwarfs |
spellingShingle |
The frequency of gaseous debris discs around white dwarfs Manser, Christopher Anãs brancas Poeira cosmica Accretion, accretion discs Line: profiles Circumstellar matter White dwarfs |
title_short |
The frequency of gaseous debris discs around white dwarfs |
title_full |
The frequency of gaseous debris discs around white dwarfs |
title_fullStr |
The frequency of gaseous debris discs around white dwarfs |
title_full_unstemmed |
The frequency of gaseous debris discs around white dwarfs |
title_sort |
The frequency of gaseous debris discs around white dwarfs |
author |
Manser, Christopher |
author_facet |
Manser, Christopher Gänsicke, Boris Fusillo, Nicola Pietro Gentile Ashley, Richard P. Breedt, Elmé Hollands, Mark Izquierdo, Paula Pelisoli, Ingrid Domingos |
author_role |
author |
author2 |
Gänsicke, Boris Fusillo, Nicola Pietro Gentile Ashley, Richard P. Breedt, Elmé Hollands, Mark Izquierdo, Paula Pelisoli, Ingrid Domingos |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Manser, Christopher Gänsicke, Boris Fusillo, Nicola Pietro Gentile Ashley, Richard P. Breedt, Elmé Hollands, Mark Izquierdo, Paula Pelisoli, Ingrid Domingos |
dc.subject.por.fl_str_mv |
Anãs brancas Poeira cosmica |
topic |
Anãs brancas Poeira cosmica Accretion, accretion discs Line: profiles Circumstellar matter White dwarfs |
dc.subject.eng.fl_str_mv |
Accretion, accretion discs Line: profiles Circumstellar matter White dwarfs |
description |
A total of 1–3 per cent of white dwarfs are orbited by planetary dusty debris detectable as infrared emission in excess above the white dwarf flux. In a rare subset of these systems, a gaseous disc component is also detected via emission lines of the Ca ii 8600 Å triplet, broadened by the Keplerian velocity of the disc. We present the first statistical study of the fraction of debris discs containing detectable amounts of gas in emission at white dwarfs within a magnitude and signal-to-noise ratio limited sample. We select 7705 single white dwarfs spectroscopically observed by the Sloan Digital Sky Survey (SDSS) and Gaia with magnitudes g ≤ 19. We identify five gaseous disc hosts, all of which have been previously discovered. We calculate the occurrence rate of a white dwarf hosting a debris disc detectable via Ca ii emission lines as 0.067±0.0420.025 per cent. This corresponds to an occurrence rate for a dusty debris disc to have an observable gaseous component in emission as 4 ± 42 per cent. Given that variability is a common feature of the emission profiles of gaseous debris discs, and the recent detection of a planetesimal orbiting within the disc of SDSS J122859.93+104032.9, we propose that gaseous components are tracers for the presence of planetesimals embedded in the discs and outline a qualitative model. We also present spectroscopy of the Ca ii triplet 8600 Å region for 20 white dwarfs hosting dusty debris discs in an attempt to identify gaseous emission. We do not detect any gaseous components in these 20 systems, consistent with the occurrence rate that we calculated. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-07-23T03:40:37Z |
dc.date.issued.fl_str_mv |
2020 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
format |
article |
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0035-8711 |
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001114937 |
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url |
http://hdl.handle.net/10183/212350 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the royal astronomical society. Oxford. Vol. 493, no. 2 (Apr. 2020), p. 2127–2139 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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