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PHL 1445 : an eclipsing cataclysmic variable with a substellar donor near the period minimum
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Marsh, Tom, Bours, Madelon C. P., Breedt, E., Rostron, J. W. and Tunnicliffe, R. L. (2015) PHL 1445 : an eclipsing cataclysmic variable with a substellar donor near the period minimum. Monthly Notices of the Royal Astronomical Society, 451 (1). pp. 114-125. doi:10.1093/mnras/stv956 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stv956
Abstract
We present high-speed, three-colour photometry of the eclipsing dwarf nova PHL 1445, which, with an orbital period of 76.3 min, lies just below the period minimum of ∼82 min for cataclysmic variable stars (CVs). Averaging four eclipses reveals resolved eclipses of the white dwarf and bright spot. We determined the system parameters by fitting a parametrized eclipse model to the averaged light curve. We obtain a mass ratio of q = 0.087 ± 0.006 and inclination i = 85∘..∘2 ± 0∘..∘9. The primary and donor masses were found to be Mw = 0.73 ± 0.03 M⊙ and Md = 0.064 ± 0.005 M⊙, respectively. Through multicolour photometry a temperature of the white dwarf of Tw = 13 200 ± 700 K and a distance of 220 ± 50 pc were determined. The evolutionary state of PHL 1445 is uncertain. We are able to rule out a significantly evolved donor, but not one that is slightly evolved. Formation with a brown dwarf donor is plausible, though the brown dwarf would need to be no older than 600 Myr at the start of mass transfer, requiring an extremely low mass ratio (q = 0.025) progenitor system. PHL 1445 joins SDSS 1433 as a sub-period minimum CV with a substellar donor. The existence of two such systems raises an alternative possibility that current estimates for the intrinsic scatter and/or position of the period minimum may be in error.
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): | Double stars, Brown dwarf stars , Dwarf novae | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | 21 July 2015 | ||||||||||
Dates: |
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Volume: | 451 | ||||||||||
Number: | 1 | ||||||||||
Page Range: | pp. 114-125 | ||||||||||
DOI: | 10.1093/mnras/stv956 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
Date of first compliant deposit: | 24 October 2016 | ||||||||||
Date of first compliant Open Access: | 24 October 2016 | ||||||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Royal Greenwich Observatory. Isaac Newton Group of Telescopes (Santa Cruz de la Palma, Canary Islands), United States. National Aeronautics and Space Administration (NASA) | ||||||||||
Grant number: | ST/J001589/1, ST/L000733/1 (STFC), 3140585 (FONDECYT) |
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