Infrared-excess white dwarfs in the Gaia 100 pc sample
Cita com:
hdl:2117/179884
Tipus de documentArticle
Data publicació2019-11
EditorOxford University Press
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
ProjecteDEL ENFRIAMIENTO A LAS EXPLOSIONES: LA FISICA DE LOS OBJETOS COMPACTOS (AEI-AYA2017-86274-P)
Abstract
We 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.
CitacióRebassa, 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.
ISSN1365-2966
Versió de l'editorhttps://academic.oup.com/mnras/article-abstract/489/3/3990/5558257
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