Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-21
Mon.Not.Roy.Astron.Soc. 341 (2003) L35
Astronomy and Astrophysics
Astrophysics
5 pages, 5 figures, MNRAS, accepted
Scientific paper
10.1046/j.1365-8711.2003.06639.x
We show that long-period dwarf novae offer a promising route for making Type Ia supernovae. For typical dwarf nova duty cycles d ~ 0.1 - 0.01, mass is accreted by the white dwarf mainly during dwarf nova outbursts at rates allowing steady nuclear burning of most of the accreted matter. Mass gains up to ~ 0.4 Msun are possible in this way. Although these are too small to allow a 0.7 Msun WD to reach the Chandrasekhar mass, they are sufficient if the WD grew to ~ 1 Msun in a previous episode of thermal-timescale mass transfer, i.e. for those long-period dwarf novae which descend from supersoft binaries. A further advantage of this picture is that the supernova always occurs in a binary of small secondary/primary mass ratio, with the secondary having very little remaining hydrogen. Both features greatly reduce the possibility of hydrogen contamination of the supernova ejecta.
King Andrew R.
Rolfe Daniel J.
Schenker Klaus
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