J/A+A/708/A275 Gaia DR3 magnetic white dwarfs in LAMOST DR10 (Yu+, 2026)
Searching for magnetic white dwarfs in LAMOST DR10.
Yu S.-C., Ren J.-J., Neustroev V.V., Hackman T., Zhang H.-T., Dong Y.-Q.,
Bai Z.-R., Yuan H.-L., Wang M., Zhou M.
<Astron. Astrophys. 708, A275 (2026)>
=2026A&A...708A.275Y 2026A&A...708A.275Y (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf ; Surveys ; Photometry ; Spectroscopy
Keywords: catalogs - surveys - white dwarfs
Abstract:
Magnetic white dwarfs (MWDs) are key to understanding the origin and
evolution of magnetic fields in compact stars. While large
spectroscopic surveys such as SDSS have greatly expanded the known
sample, the potential of LAMOST has not yet been fully explored. Our
aim is to identify and characterize isolated MWDs in the LAMOST data
release ten (DR10).
We crossmatched LAMOST DR10 spectra with white dwarf candidates from
Gaia early data release three (EDR3) and with recent SDSS-based
catalogs of MWDs. Zeeman splitting in Balmer and helium absorption
lines was used as the primary diagnostic to identify magnetic fields
and to estimate their strengths. Reference objects from the SDSS
catalogs were used to test the detectability of MWDs in LAMOST
low-resolution spectra.
We identified 63 isolated MWDs in LAMOST DR10, 32 of which are new
discoveries. Surface magnetic field strengths were measured from
Zeeman splitting, covering a range from a few megagauss up to several
tens. For previously known SDSS MWDs, our LAMOST-based field
measurements mostly show agreement with published values.
This work demonstrates the capability of LAMOST low-resolution
spectroscopy to identify and characterize isolated MWDs. The newly
discovered objects expand the known population and provide valuable
targets for future high-resolution spectroscopic and polarimetric
follow-up studies. Our results highlight the potential of combining
LAMOST with Gaia and other large surveys to build a more complete
census of MWDs.
Description:
We built this catalog by cross-matching the LAMOST DR10 spectroscopic
database with the Gaia EDR3 white dwarf catalogue (Gentile Fusillo et
al., 2021MNRAS.508.3877G 2021MNRAS.508.3877G, Cat. J/MNRAS/508/3877). A cross-match radius
of 3 arcsec was employed to identify spectroscopic counterparts for
Gaia-detected WDs and candidates.
A catalog of 10279 spectra produced by cross-matching the LAMOST DR10
with the Gaia EDR3 white dwarf catalogue (Gentile Fusillo et al.,
2021MNRAS.508.3877G 2021MNRAS.508.3877G, Cat. J/MNRAS/508/3877).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 121 10279 Cross-matched white dwarf candidates
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
V/162 : LAMOST DR11 catalogs (Luo+, 2026)
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- 10 I10 --- ObsID Unique LAMOST spectrum ID for each observation
12- 16 I5 --- LMJD Local modified Julian day
18- 37 A20 --- PlanID LAMOST Plan name
39- 40 I2 --- spID LAMOST Spectrograph ID
42- 44 I3 --- FiberID LAMOST Fiber ID
46- 56 F11.7 deg RAdeg LAMOST right ascension (J2000)
58- 67 F10.7 deg DEdeg LAMOST Declination (J2000)
69- 87 I19 --- GaiaDR3 GAIA identifier
89- 93 F5.2 mas Plx Gaia parallax
95- 99 F5.2 mag BPmag Gaia BP magnitude
101-105 F5.2 mag RPmag Gaia RP magnitude
107-111 F5.2 mag Gmag GaiA G magnitude
113-116 F4.2 --- PWD Probability of being a white dwarf
(Gentile Fusillo et al., 2021MNRAS.508.3877G 2021MNRAS.508.3877G,
Cat. J/MNRAS/508/3877)
118-121 F4.2 arcsec Sep Separation between LAMOST and Gaia coordinates
for the same target
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Acknowledgements:
From Si-Cheng Yu, sichengyu94(at)gmail.com
This work is supported by and based on the survey of Guoshoujing
Telescope. Guoshoujing Telescope (the Large Sky Area Multi-Object
Fiber Spectroscopic Telescope, LAMOST) is a National Major Scientific
Project built by the Chinese Academy of Sciences.
License: CC-BY-4.0 [see https://spdx.org/licenses/]
(End) Patricia Vannier [CDS] 13-Mar-2026