New sample of Galactic white dwarfs Virtual Observatory Resource

Authors
  1. Sidharth A.V.
  2. Shridharan B.
  3. Mathew B.
  4. Devaraj A.
  5. Cysil T.B.,Stalin C.S.
  6. Arun R.
  7. Bhattacharyya S.
  8. Kartha S.S.
  9. Robin T.
  10. Published by
    CDS
Abstract

In this study, we demonstrate the efficacy of the Ultraviolet Imaging Telescope (UVIT) in identifying and characterizing white dwarfs (WDs) within the Milky Way Galaxy. Leveraging the UVIT point source catalogue towards SMC and crossmatching with Gaia DR3 data, we identified 43 single WDs (37 new detections), 13 new WD+main sequence (MS) candidates and 161 UV bright MS stars by analysing their Spectral Energy Distributions (SED). Using the WD evolutionary models, we determine the masses, effective temperatures, and cooling ages of these identified WDs. Masses of these WDs range from 0.2 to 1.3M_{sun}_ and effective temperatures (Teff) between 10000K to 15000K, with cooling ages spanning 0.1 to 2Gyr. Notably, we detect hotter WDs compared to literature values, which is attributed to the sensitivity of UVIT. Furthermore, we report the detection of 20 new extremely low-mass (ELM) candidates from our analysis. Future spectroscopic studies of the ELM candidates will help us understand the formation scenarios of these exotic objects. Despite limitations in Gaia DR3 distance measurements for optically faint WDs, we provide a crude estimate of the WD space density within 1kpc as 1.3x10^-3^pc^-3^, which is higher than previous estimates in the literature. Our results underscore the instrumental capabilities of UVIT and anticipate the forthcoming UV missions like INSIST for systematic WD discovery. Our methodology sets a precedent for future analyses in other UVIT fields to find more WDs and perform spectroscopic studies to verify their candidacy.

Keywords
  1. milky-way-galaxy
  2. white-dwarf-stars
  3. ultraviolet-photometry
Bibliographic source Bibcode
2024A&A...690A..68S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/690/A68
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/690/A68
Document Object Identifer DOI
doi:10.26093/cds/vizier.36900068

Access

IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/690/A68/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/690/A68/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/690/A68/table1?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/690/A68/table2?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/690/A68/table2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/690/A68/table2?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/690/A68/tablea1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/690/A68/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/690/A68/tablea1?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/690/A68/tableb1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/690/A68/tableb1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/690/A68/tableb1?

History

2024-09-27T10:38:50Z
Resource record created
2024-09-27T10:38:50Z
Created
2025-02-18T20:01:41Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr