J-PLUS: Spectral evolution of white dwarfs by PDF analysis

We estimated the spectral evolution of white dwarfs with effective temperature using Javalambre Photometric Local Universe Survey (J-PLUS) second data release (DR2), that provides twelve photometric optical passbands over 2176 deg2. analysed 5926 r <= 19.5 mag in common between a dwarf catalog defined from Gaia EDR3 and J-PLUS DR2. performed Bayesian analysis by comparing observed photometry theoretical models hydrogen (H) helium (He) dominated atmospheres. PDF for (Teff), surface gravity, parallax, type; probability having H-dominated atmosphere (pH) each source. applied prior measurements as reference, derived self-consistent atmospheric composition function Teff. described fraction He-dominated (fHe) linear Teff at 5000 < 30000 K. found fHe = 0.24 +- 0.01 10000 K, change rate along cooling sequence 0.14 0.02 per 10 kK, minimum 0.08 high-temperature end. tested obtained pH comparison spectroscopic classifications, finding it is reliable. mass distribution 351 sources distance d 100 pc, M > 0.45 Msun, 6000 The result agrees previous work, dominant 0.59 Msun peak presence an excess ~ 0.8 Msun. This high-mass absent distribution, which presents single peak. reliable statistical classification into H- find 21 3 % increase 20000 K to