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A Bayesian model for inferring properties of the local white dwarf population in astrometric and photometric surveys

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Title: A Bayesian model for inferring properties of the local white dwarf population in astrometric and photometric surveys
Authors: Widmark, A
Mortlock, DJ
Peiris, HV
Item Type: Journal Article
Abstract: The Gaia mission is providing precise astrometry for an unprecedented number of white dwarfs (WDs), encoding information on stellar evolution, Type Ia supernovae progenitor scenarios, and the star formation and dynamical history of the Milky Way. With such a large data set, it is possible to infer properties of the WD population using only astrometric and photometric informations. We demonstrate a framework to accomplish this using a mock data set with Sloan Digital Sky Survey ugriz photometry and Gaia astrometric information. Our technique utilizes a Bayesian hierarchical model for inferring properties of a WD population while also taking into account all observational errors of individual objects, as well as selection and incompleteness effects. We demonstrate that photometry alone can constrain the WD population’s distributions of temperature, surface gravity, and atmospheric composition, and that astrometric information significantly improves determination of the WD surface gravity distribution. We also discuss the possibility of identifying unresolved binary WDs using only photometric and astrometric informations.
Issue Date: 1-May-2019
Date of Acceptance: 4-Feb-2019
URI: http://hdl.handle.net/10044/1/68218
DOI: https://dx.doi.org/10.1093/mnras/stz367
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 179
End Page: 188
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 485
Issue: 1
Copyright Statement: © 2019 The Author(s). All rights reserved.
Sponsor/Funder: Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST-N000838
ST/N000838/1
Keywords: 0201 Astronomical And Space Sciences
Astronomy & Astrophysics
Publication Status: Published
Online Publication Date: 2019-02-06
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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