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Orbital periods and component masses of three double white dwarfs
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Rebassa-Mansergas, A., Parsons, S. G., García–Berro, E., Gänsicke, B. T. (Boris T.), Schreiber, M. R., Rybicka, M. and Koester, D. (2016) Orbital periods and component masses of three double white dwarfs. Monthly Notices of the Royal Astronomical Society, 466 (2). pp. 1575-1581. doi:10.1093/mnras/stw3155 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stw3155
Abstract
The merger of close double white dwarfs (CDWDs) is one of the favourite evolutionary channels for producing Type Ia supernovae (SN Ia). Unfortunately, current theories of the evolution and formation of CDWDs are still poorly constrained and have several serious uncertainties that affect the predicted SN Ia rates. Moreover, current observational constraints on this evolutionary pathway for SN Ia mainly rely on only 17 double-lined and/or eclipsing CDWDs with measured orbital and stellar parameters for both white dwarfs. In this paper, we present the orbital periods and the individual masses of three new double-lined CDWDs, derived using a new method. This method employs mass ratios, the Hα core ratios and spectral model fitting to constrain the masses of the components of the pair. The three CDWDs are WD0028–474 (Porb = 9.350 ± 0.007 h, M1 = 0.60 ± 0.06 M⊙, M2 = 0.45 ± 0.04 M⊙), HE0410–1137 (Porb = 12.208 ± 0.008 h, M1 = 0.51 ± 0.04 M⊙, M2 = 0.39 ± 0.03 M⊙) and SDSSJ031813.25–010711.7 (Porb = 45.908 ± 0.006 h, among the longest period systems, M1 = 0.40 ± 0.05 M⊙, M2 = 0.49 ± 0.05 M⊙). While the three systems studied here will merge in time-scales longer than the Hubble time and are expected to become single massive ( ≳ 0.9 M⊙) white dwarfs rather than exploding as SN Ia, increasing the small sample of CDWDs with determined stellar parameters is crucial for a better overall understanding of their evolution.
| 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 , Astronomical spectroscopy, Double stars | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 0035-8711 | ||||||||
| Official Date: | 5 December 2016 | ||||||||
| Dates: |
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| Volume: | 466 | ||||||||
| Number: | 2 | ||||||||
| Page Range: | pp. 1575-1581 | ||||||||
| DOI: | 10.1093/mnras/stw3155 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 10 March 2017 | ||||||||
| Date of first compliant Open Access: | 10 March 2017 | ||||||||
| Funder: | Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC), Chile. Ministerio de Economía, Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), L'Agència de Gestió d'Ajuts Universitaris i de Recerca (AGAUR) | ||||||||
| Grant number: | AYA2014-59084-P (MINECO), FP/2007-2013 (FP7), n.320964 (ERC), P10-022-F (Chile. Ministerio de Economía), 1100782 (FONDECYT), 3140585 (FONDECYT) | ||||||||
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