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dc.contributor.authorRebassa Mansergas, Alberto
dc.contributor.authorSolano Márquez, Enrique
dc.contributor.authorXu, Siyi
dc.contributor.authorRodrigo Blanco, Carlos
dc.contributor.authorJiménez Esteban, F. M.
dc.contributor.authorTorres Gil, Santiago
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationRebassa, A. [et al.]. Infrared-excess white dwarfs in the Gaia 100 pc sample. "Montly Notices of the Royal Astronomical Society", Novembre 2019, vol. 489, núm. 3, p. 3990-4000.
dc.description.abstractWe analyse the 100¿pc Gaia white dwarf volume-limited sample by means of VOSA (Virtual Observatory SED Analyser) with the aim of identifying candidates for displaying infrared excesses. Our search focuses on the study of the spectral energy distribution (SED) of 3733 white dwarfs with reliable infrared photometry and GBP - GRP colours below 0.8 mag, a sample that seems to be nearly representative of the overall white dwarf population. Our search results in 77 selected candidates, 52 of which are new identifications. For each target, we apply a two-component SED fitting implemented in VOSA to derive the effective temperatures of both the white dwarf and the object causing the excess. We calculate a fraction of infrared-excess white dwarfs due to the presence of a circumstellar disc of 1.6 ± 0.2 per¿cent, a value that increases to 2.6 ± 0.3 per¿cent if we take into account incompleteness issues. Our results are in agreement with the drop in the percentage of infrared excess detections for cool (<8000¿K) and hot (>20¿000¿K) white dwarfs obtained in previous analyses. The fraction of white dwarfs with brown dwarf companions we derive is ¿0.1–0.2 per¿cent.
dc.format.extent11 p.
dc.publisherOxford University Press
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Aeronàutica i espai
dc.subject.lcshWhite dwarf stars
dc.subject.lcshBrown dwarf stars
dc.subject.lcshCircumstellar matter--Observations
dc.subject.otherVirtual observatory tools
dc.subject.otherBrown dwarfs
dc.subject.otherCircumstellar matter
dc.subject.otherWhite dwarfs
dc.titleInfrared-excess white dwarfs in the Gaia 100 pc sample
dc.subject.lemacEstels nans
dc.subject.lemacAstronomia -- Observacions
dc.contributor.groupUniversitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorRebassa, A.; Solano, E.; Xu, S.; Rodrigo , C.; Jiménez, F.; Torres, S.
local.citation.publicationNameMontly Notices of the Royal Astronomical Society

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