The Gaia white dwarf population within 100 pc of the Sun
2018
The recent Gaia Data Release 2 has provided an
unprecedented sample of the local white dwarf
population. The high astrometric resolution and
the photometry provided by Gaia allows to build a
clean magnitude-color diagram that, with the aid
of the most updated population synthesis simulator,
permit us to select the sample of white dwarf
candidates. Our analysis shows that Gaia has virtually
identified all white dwarfs within 100 pc from
the Sun. Additionally, we use the Virtual Observatory
tool VOSA to derive effective temperatures and
luminosities for our sources by fitting their spectral
energy distributions. The Gaia 100 pc white dwarf
population is clearly dominated by cool ( 8,000
K) objects and reveals a significant population of
massive (M 0:8M ) white dwarfs, of which
no more than 30 ? 40% can be attributed to
hydrogen-deficient atmospheres. Preliminary results
including white dwarf mergers seem not to
explain this excess unless some ad hoc hypothesis
are adopted. Finally, we use an Intelligent Artificial
algorithm based on the Random Forest method to
disentangle the different Galactic components of
the white dwarf population. Our results show that
the thin, thick and halo ratio in the 100 pc sample
is 89:11:1, identifying 97 halo white dwarf candidates.
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