J/ApJ/970/181 Categorizing WDs with Gaia XP spectra and UMAP (Kao+, 2024)
Hunting for Polluted White Dwarfs and Other Treasures with Gaia XP Spectra and
Unsupervised Machine Learning.
Kao M.L., Hawkins K., Rogers L.K., Bonsor A., Dunlap B.H., Sanders J.L.,
Montgomery M.H., Winget D.E.
<Astrophys. J., 970, 181 (2024)>
=2024ApJ...970..181K 2024ApJ...970..181K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf ; Positional data ; Optical
Keywords: Gaia - white dwarf stars - DZ stars
Abstract:
White dwarfs (WDs) polluted by exoplanetary material provide the
unprecedented opportunity to directly observe the interiors of
exoplanets. However, spectroscopic surveys are often limited by
brightness constraints, and WDs tend to be very faint, making
detections of large populations of polluted WDs difficult. In this
paper, we aim to increase considerably the number of WDs with multiple
metals in their atmospheres. Using 96134 WDs with Gaia DR3 BP/RP (XP)
spectra, we constructed a 2D map using an unsupervised
machine-learning technique called Uniform Manifold Approximation and
Projection (UMAP) to organize the WDs into identifiable spectral
regions. The polluted WDs are among the distinct spectral groups
identified in our map. We have shown that this selection method could
potentially increase the number of known WDs with five or more metal
species in their atmospheres by an order of magnitude. Such systems
are essential for characterizing exoplanet diversity and geology.
Description:
This catalog contains the WDJname, GaiaEDR3 ID, RA, DEC, and UMAP
coordinates, UMAP1 and UMAP2, for all 96134 white dwarfs in the UMAP
described in our paper in ApJ found here:
https://iopscience.iop.org/article/10.3847/1538-4357/ad5d6e.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 104 96134 UMAP WD catalog
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/MNRAS/508/3877 : Catalogue of white dwarfs in Gaia EDR3 (Gentile+, 2021)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Name WDJ name (WDJHHMMSS.ss+DDMMSS.ss)
24- 42 I19 --- GaiaEDR3 Gaia EDR3 identifier
44- 57 F14.10 deg RAdeg Right Ascension (J2000)
59- 72 E14.6 deg DEdeg Declination (J2000)
74- 88 E15.7 --- UMAP1 UMAP 1 coordinate
90-104 E15.7 --- UMAP2 UMAP 2 coordinate
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Acknowledgements:
Malia Kao, mlkao(at)utexas.edu
(End) Patricia Vannier [CDS] 11-Sep-2024