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The expanding bipolar shell of the helium nova V445 Puppis
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Woudt, P. A., Steeghs, D., Karovska, M., Warner, Brian, Groot, P. J., Nelemans, G., Roelofs, Gijs H. A., Marsh, T. R., Nagayama, T., Smits, D. P. and O'Brien, T. (2009) The expanding bipolar shell of the helium nova V445 Puppis. Astrophysical Journal, Vol.706 (No.1). pp. 738-746. doi:10.1088/0004-637X/706/1/738 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/706/1/738
Abstract
From multi-epoch adaptive optics imaging and integral field unit spectroscopy, we report the discovery of an expanding and narrowly confined bipolar shell surrounding the helium nova V445 Puppis (Nova Puppis 2000). An equatorial dust disc obscures the nova remnant, and the outflow is characterized by a large polar outflow velocity of 6720 +/- 650 km s(-1) and knots moving at even larger velocities of 8450 +/- 570 km s(-1). We derive an expansion parallax distance of 8.2 +/- 0.5 kpc and deduce a pre-outburst luminosity of the underlying binary of log L/L-circle dot = 4.34 +/- 0.36. The derived luminosity suggests that V445 Puppis probably contains a massive white dwarf accreting at high rate from a helium star companion making it part of a population of binary stars that potentially lead to supernova Ia explosions due to accumulation of helium-rich material on the surface of a massive white dwarf.
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): | B stars, Cataclysmic variable stars | ||||
Journal or Publication Title: | Astrophysical Journal | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0004-637X | ||||
Official Date: | 20 November 2009 | ||||
Dates: |
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Volume: | Vol.706 | ||||
Number: | No.1 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 738-746 | ||||
DOI: | 10.1088/0004-637X/706/1/738 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 8 December 2015 | ||||
Date of first compliant Open Access: | 8 December 2015 | ||||
Funder: | National Research Foundation (South Africa), University of Cape Town, Smithsonian Astrophysical Observatory, Science and Technology Facilities Council (Great Britain) (STFC), United States. National Aeronautics and Space Administration (NASA) | ||||
Grant number: | NAS8-03060 (NASA) | ||||
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