J/A+A/683/A33 New nearby white dwarfs using Gaia DR3 (Golovin+, 2024)
Identification of new nearby white dwarfs using Gaia DR3.
Golovin A., Reffert S., Vani A., Bastian U., Jordan S., Just A.
<Astron. Astrophys. 683, A33 (2024)>
=2024A&A...683A..33G 2024A&A...683A..33G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, white dwarf ; Optical
Keywords: astrometry - stars: distances - Hertzsprung-Russell and C-M diagrams -
white dwarfs - solar neighborhood - Galaxy: stellar content
Abstract:
A volume-complete sample of white dwarfs is essential for statistical
studies of the white dwarf population. The sample of nearby white
dwarfs is the only one that allows the faint end of the luminosity
function to be probed and thus is the only one that covers the entire
range of white dwarf ages. However, due to their intrinsic faintness,
even nearby white dwarfs are difficult to identify.
Our work focuses on improving the completeness and purity of the white
dwarf census within 50pc of the Sun. To accomplish this, we used Gaia
Data Release 3 (Gaia DR3) to identify and characterise new and
previously overlooked white dwarfs in the solar neighbourhood. We also
identify objects with spurious astrometric solutions in Gaia DR3 but
claimed as high-confidence white dwarfs in the Gaia Catalogue of White
Dwarfs (GCWD21) by Gentile Fusillo et al. (2021MNRAS.508.3877G 2021MNRAS.508.3877G,
Cat. J/MNRAS/508/3877).
Based on the astrometry and photometry in Gaia DR3, we identified new
nearby white dwarfs and validated those that had been missed from
recent white dwarf catalogues despite being previously documented. To
ensure the reliability of their astrometric solutions, we used a cut
on just two parameters from Gaia DR3: the amplitude of the image
parameter determination goodness-of-fit and the parallax-over-error
ratio. In addition, we imposed photometric signal-to-noise
requirements to ensure the reliable identification of white dwarfs
when using the colour-magnitude diagram.
We have identified nine previously unreported white dwarfs within the
local population of 50pc, and validated 21 previously reported white
dwarfs missing from the GCWD21 and other recent volume-limited white
dwarf samples. A few of these objects belong to the rare class of
ultra-cool white dwarfs. Four white dwarfs in our sample have an
effective temperature of Teff≤4000K within the 1σ interval, and
two of them have an absolute magnitude of MG>16.0mag. The
identified white dwarfs are predominantly located in crowded fields,
such as near the Galactic plane or in the foreground of the Large
Magellanic Cloud. We also find that 20 of these white dwarfs have
common proper motion companions with angular separations ranging from
1.1" to 7.1" and brightness differences between the components of up
to 9.8 magnitudes. One of these systems is a triple system consisting
of a white dwarf and two K dwarfs, while another is a double white
dwarf system. The identified white dwarfs represent a 1.3% improvement
in the completeness of the 50pc sample, resulting in a new total of
2265 known white dwarfs located within 50pc of the Sun. We have
identified 103 contaminants among the 2338 high-confidence white
dwarfs in the 50pc subsample of the GCWD21 and have found that their
astrometric solutions in Gaia DR3 are spurious, improving the purity
by 4.4%.
Description:
We have identified nine new white dwarfs and validated 21 previously
reported white dwarf candidates within the 50pc local population
based on the astrometry and photometry from Gaia DR3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 144 30 New and validated white dwarfs within 50pc and
their parameters from Gaia DR3
table2.dat 115 19 CPM companions to the white dwarfs identified
in this work
table3.dat 103 30 Stellar parameters for the white dwarfs listed
in Table 1
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Coll., 2022)
J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars - GCNS (Gaia Coll., 2021)
J/MNRAS/518/3055 : Gaia white dwarfs within 40pc. III (O'Brien+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Source identifier in Gaia DR3 (source_id)
21- 29 F9.5 deg RAdeg Right ascension (ICRS) at Ep=2016.0
31- 39 F9.5 deg DEdeg Declination (ICRS) at Ep=2016.0
41- 46 F6.3 mas plx Absolute trigonometric parallax
48- 52 F5.3 mas e_plx Error in parallax
54- 61 F8.3 mas/yr pmRA Proper motion in right ascension
64- 68 F5.3 mas/yr e_pmRA Error in pmRA
70- 77 F8.3 mas/yr pmDE Proper motion in declination
80- 84 F5.3 mas/yr e_pmDE Error in pmDE
86- 93 F8.5 mag Gmag G band mean magnitude
95-101 F7.5 mag e_Gmag Error in Gmag
103-108 F6.3 mag BP-RP BP-RP colour
111-115 F5.3 mag e_BP-RP Error in BP-RP
117-134 I18 --- PS1 ? PS1 identifier
136-144 A9 --- Ref Reference where the object has been reported
as a white dwarf (1)
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Note (1): Reference as follows:
1 = El-badry et al., 2021MNRAS.506.2269E 2021MNRAS.506.2269E
2 = O'Brien et al., 2023MNRAS.518.3055O 2023MNRAS.518.3055O, Cat. J/MNRAS/518/3055
3 = Gaia Collaboration , 2021A&A...649A...6G 2021A&A...649A...6G, Cat. J/A+A/649/A6
4 = Gentile Fusillo et al., 2019MNRAS.482.4570G 2019MNRAS.482.4570G, Cat. J/MNRAS/482/4570
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Source identifier in Gaia DR3 (source_id)
of the white dwarf
21- 39 I19 --- CPM Source identifier in Gaia DR3 (source_id)
of the CPM companion
41- 46 F6.3 mas plx Absolute trigonometric parallax
of the CPM companion
48- 52 F5.3 mas e_plx Error in parallax
54- 61 F8.3 mas/yr pmRA Proper motion in right ascension
of the CPM companion
64- 68 F5.3 mas/yr e_pmRA Error in pmRA
70- 77 F8.3 mas/yr pmDE Proper motion in declination
of the CPM companion
80- 84 F5.3 mas/yr e_pmDE Error in pmDE
86- 91 F6.3 mag Gmag G band mean magnitude of the CPM companion
93- 97 F5.3 mag BP-RP BP-RP colour of the CPM companion
99-103 A5 --- SpType Spectral type of the CPM companion
105-108 F4.2 arcsec rho Angular separation
110-115 F6.2 AU s Projected separation
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Source identifier in Gaia DR3 (source_id)
of the white dwarf
21- 25 I5 K TeffDA Effective temperature (DA solution)
27- 30 I4 K e_TeffDA Error in TeffDA
32- 35 F4.2 [cm/s2] loggDA Surface gravity (DA solution)
37- 40 F4.2 [cm/s2] e_loggDA Error in loggDA
42- 45 F4.2 Msun MDA Mass (DA solution)
47- 50 F4.2 Msun e_MDA Error in M_DA
52- 56 F5.2 mag MbolDA Bolometric magnitude (DA solution)
58- 61 F4.2 mag e_MbolDA Error in MbolDA
63- 67 I5 K TeffDB Effective temperature (DB solution)
69- 72 I4 K e_TeffDB Error in TeffDB
74- 77 F4.2 [cm/s2] loggDB Surface gravity (DB solution)
79- 82 F4.2 [cm/s2] e_loggDB Error in loggDB
84- 87 F4.2 Msun MDB Mass (DB solution)
89- 92 F4.2 Msun e_MDB Error in M_DB
94- 98 F5.2 mag MbolDB Bolometric magnitude (DB solution)
100-103 F4.2 mag e_MbolDB Error in MbolDB
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Acknowledgements:
Alex Golovin, agolovin(at)lsw.uni-heidelberg.de
(End) Patricia Vannier [CDS] 14-Mar-2024