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The miniJPAS survey : white dwarf science with 56 optical filters
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(2022) The miniJPAS survey : white dwarf science with 56 optical filters. Astronomy & Astrophysics, 665 . A151. doi:10.1051/0004-6361/202243584 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/202243584
Abstract
Aims. We analyze the white dwarf population in miniJPAS, the first square degree observed with 56 medium-band, 145 Å in width optical filters by the Javalambre Physics of the accelerating Universe Astrophysical Survey (J-PAS), to provide a data-based forecast for the white dwarf science with low-resolution (R ∼ 50) photo-spectra.
Methods. We define the sample of the bluest point-like sources in miniJPAS with r < 21.5 mag, a point-like probability larger than 0.5, (u − r)< 0.80 mag, and (g − i)< 0.25 mag. This sample comprises 33 sources with spectroscopic information: 11 white dwarfs and 22 quasi-stellar objects (QSOs). We estimate the effective temperature (Teff), the surface gravity, and the composition of the white dwarf population by a Bayesian fitting to the observed photo-spectra.
Results. The miniJPAS data are sensitive to the Balmer series and the presence of polluting metals. Our results, combined with those from the Javalambre Photometric Local Universe Survey (J-PLUS) which has a lower spectral resolution but has already observed thousands of white dwarfs, suggest that J-PAS photometry would permit – down to r ∼ 21.5 mag and at least for sources with 7000 < Teff < 22 000 K – both the classification of the observed white dwarfs into H-dominated and He-dominated with 99% confidence and the detection of calcium absorption for equivalent widths larger than 15 Å. The effective temperature is estimated with a 2% uncertainty, which is close to the 1% from spectroscopy. A precise estimation of the surface gravity depends on the available parallax information. In addition, the white dwarf population at Teff > 7000 K can be segregated from the bluest extragalactic QSOs, providing a clean sample based on optical photometry alone.
Conclusions. The J-PAS low-resolution photo-spectra would produce precise effective temperatures and atmospheric compositions for white dwarfs, complementing the data from Gaia. J-PAS will also detect and characterize new white dwarfs beyond the Gaia magnitude limit, providing faint candidates for spectroscopic follow-up.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | White dwarf stars, Astrophysics | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Publisher: | EDP Sciences | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ISSN: | 0004-6361 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Official Date: | 23 September 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Volume: | 665 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Number of Pages: | 13 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Article Number: | A151 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1051/0004-6361/202243584 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 8 November 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 9 November 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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