J/A+A/658/A79 J-PLUS white dwarf atmospheric parameters (Lopez-Sanjuan+, 2022)
J-PLUS: Spectral evolution of white dwarfs by PDF analysis.
Lopez-Sanjuan C., Tremblay P.-E., Ederoclite A., Vazquez Ramio H.,
Carrasco J.M., Varela J., Cenarro A.J., Marin-Franch A., Civera T.,
Daflon S., Gaensicke B.T., Gentile Fusillo N.P., Jimenez-Esteban F.M.,
Alcaniz J., Angulo R.E., Cristobal-Hornillos D., Dupke R.A.,
Hernandez-Monteagudo, C., Moles M., Sodre Jr.L.
<Astron. Astrophys. 658, A79 (2022)>
=2022A&A...658A..79L 2022A&A...658A..79L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf ; Effective temperatures ; Stars, masses ;
Optical
Keywords: white dwarfs - methods: statistical
Abstract:
We estimated the spectral evolution of white dwarfs with effective
temperature using the Javalambre Photometric Local Universe Survey
(J-PLUS) second data release (DR2), which provides 12 photometric
optical passbands over 2176deg2. We analyzed 5926 white dwarfs with
r<19.5mag in common between a white dwarf catalog defined from Gaia
EDR3 and J-PLUS DR2. We performed a Bayesian analysis by comparing the
observed J-PLUS photometry with theoretical models of hydrogen- and
helium-dominated atmospheres. We estimated the probability
distribution functions for effective temperature (Teff), surface
gravity, parallax, and composition; and the probability of having a
H-dominated atmosphere (pH) for each source. We applied a prior in
parallax, using Gaia EDR3 measurements as a reference, and derived a
self-consistent prior for the atmospheric composition as a function of
Teff. We described the fraction of white dwarfs with a He-dominated
atmosphere (fHe) with a linear function of the effective temperature
at 5000<Teff<30000K. We find fHe=0.24±0.01 at Teff=10000K, a
change rate along the cooling sequence of 0.14±0.02 per 10kK, and a
minimum He-dominated fraction of 0.08±0.02 at the high-temperature
end. We tested the obtained pH by comparison with spectroscopic
classifications, finding that it is reliable. We estimated the mass
distribution for the 351 sources with distance d<100pc, mass
M>0.45M☉, and Teff>6000K. The result for H-dominated white
dwarfs agrees with previous studies, with a dominant M=0.59M☉
peak and the presence of an excess at M∼0.8M☉. This high-mass
excess is absent in the He-dominated distribution, which presents a
single peak. The J-PLUS optical data provide a reliable statistical
classification of white dwarfs into H- and He-dominated atmospheres.
We find a 21±3% increase in the fraction of He-dominated white
dwarfs from Teff=20000K to Teff=5000K.
Description:
The catalog presents the inferred atmospheric parameters for the 5926
white dwarfs with r<19.5mag in common between the white dwarf catalog
defined from Gaia EDR3 in Gentile Fusillo et al. (2021MNRAS.508.3877G 2021MNRAS.508.3877G,
Cat. J/MNRAS/508/3877) and J-PLUS DR2 (Cenarro et al.,
2019A&A...622A.176C 2019A&A...622A.176C). The J-PLUS twelve-band photometry is compared
with theoretical models to derive the probability density functions
(PDFs) for the effective temperature (Teff), the surface gravity, and
the parallax by assuming H- and He-dominated atmopsheres. We used
pure-H models to describe H-dominated atmospheres (Tremblay et al.,
2011ApJ...730..128T 2011ApJ...730..128T, Cat. J/ApJ/730/128, 2013A&A...559A.104T 2013A&A...559A.104T), while
mixed models with H/He =10-5 at Teff>6500K and pure-He models at
Teff<6500K were used to describe He-dominated atmospheres (Cukanovaite
et al., 2018MNRAS.481.1522C 2018MNRAS.481.1522C, 2019MNRAS.490.1010C 2019MNRAS.490.1010C). The mass-radius
relation of Fontaine et al. (2001PASP..113..409F 2001PASP..113..409F) for thick
(H-atmospheres) and thin (He-atmospheres) hydrogen layers was assumed
in the modeling. We obtained the summary statistics for each parameter
by marginalizing the PDFs over the other parameters at a fixed
atmospheric composition and performing a Gaussian fit to the resulting
distribution. The reported parameters and their uncertainties are the
median and the dispersion of the best-fitting Gaussian. We also
provide the probability of having a H-dominated atmosphere (pH) for
each source in the table. In those cases where pH is different from
both zero and one, we included the atmospheric parameters for both H-
and He-dominated atmospheres. These values should be weighted with the
corresponding pH to provide meaningful results. The r-band magnitude
and the mass were obtained as the PDF-weighted values from the models.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
wdpda.dat 175 5926 Atmospheric parameters for J-PLUS DR2 white dwarfs
--------------------------------------------------------------------------------
See also:
http://archive.cefca.es/catalogues/jplus-dr2 : J-PLUS DR2 Home Page
Byte-by-byte Description of file: wdpda.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Tile-Id Identifier of the J-PLUS Tile image in the
r band where the object was detected
7- 12 I6 --- Number Number identifier assigned by SExtractor
for the object in the r-band image
14- 21 F8.4 deg RAdeg Right ascension in equatorial coordinates
(J2000)
23- 29 F7.4 deg DEdeg Declination in equatorial coordinates
(J2000)
31- 35 F5.2 mag rmag De-reddened total r-band apparent
magnitude
37- 40 F4.2 mag e_rmag Uncertainty in rmag
42- 45 F4.2 --- psel Selection probability for rmag≤19.5mag
and 1≤parallax≤100mas
47- 51 F5.3 --- pH Probability of having a H-dominated
atmosphere
53- 60 F8.1 K TeffH Effective temperature for a H-dominated
atmosphere
62- 68 F7.1 K e_TeffH Uncertainty in TeffH
70- 73 F4.2 [0.01m/s2] loggH Decimal logarithm of the surface gravity
for a H-dominated atmosphere
75- 78 F4.2 [0.01m/s2] e_loggH Uncertainty in loggH
80- 84 F5.2 mas plxH Parallax for a H-dominated atmosphere
86- 89 F4.2 mas e_plxH Uncertainty in plxH
91- 95 F5.3 Msun MassH Mass for a H-dominated atmosphere
97-101 F5.3 Msun e_MassH Uncertainty in massH
103-114 F12.2 pc3 VH Effective volume at 10≤d≤1000pc for
a H-dominated atmosphere
116-122 F7.1 K TeffHe Effective temperature for a He-dominated
atmosphere
124-129 F6.1 K e_TeffHe Uncertainty in TeffHe
131-134 F4.2 [0.01m/s2] loggHe Decimal logarithm of the surface gravity
for a He-dominated atmosphere
136-139 F4.2 [0.01m/s2] e_loggHe Uncertainty in loggHe
141-145 F5.2 mas plxHe Parallax for a He-dominated atmosphere
147-150 F4.2 mas e_plxHe Uncertainty in plxHe
152-156 F5.3 Msun MassHe Mass for a He-dominated atmosphere
158-162 F5.3 Msun e_MassHe Uncertainty in massHe
164-175 F12.2 pc3 VHe Effective volume at 10≤d≤1000pc for
a He-dominated atmosphere
--------------------------------------------------------------------------------
Acknowledgements:
Carlos Lopez San Juan, clsj(at)cefca.es
(End) Carlos Lopez San Juan [CEFCA], Patricia Vannier [CDS] 28-Dec-2021