J-PLUS DR3 white dwarf catalog

Outliers were identified as sources with chi^2^>=23.2, indicating significant deviations from the best-fitting model. We analyzed the residuals from the fits using the uniform manifold approximation and projection (UMAP) technique, which enables the classification of outliers into distinct categories. The catalog includes 14844 white dwarfs with r<20mag and 1<plx<100mas, with 72% of the sources lacking spectroscopic (R>500) classification.

The application of UMAP to the residuals identified three main types of outliers: random measurement fluctuations (391 sources), metal-polluted white dwarfs (98 sources), and two-component systems (282 sources). The last category also includes white dwarfs with strong carbon absorption lines. We validated the reliability of J-PLUS classifications by comparison with spectroscopy from the Sloan Digital Sky Survey and the Dark Energy Spectroscopic Instrument, and with Gaia BP/RP low-resolution spectra, confirming a one-to-one correspondence between J-PLUS photometric and spectroscopic classifications.

The J-PLUS DR3 white dwarf catalog provides a robust dataset for statistical studies. The use of dimensionality reduction techniques enhances the identification of peculiar objects, making this catalog a valuable resource for the selection of interesting targets such as metal-polluted white dwarfs or binary systems.