Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-02-21
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Submitted to ApJ Letters
Scientific paper
In the single degenerate scenario for Type Ia supernova (SNeIa), a white dwarf (WD) must gain a significant amount of matter from a companion star. Because the accreted mass carries angular momentum, the WD is likely to achieve fast spin periods, which can increase the critical mass, $M_{crit}$, needed for explosion. When $M_{crit}$ is higher than the maximum mass achieved by the WD, the WD must spin down before it can explode. This introduces a delay between the time at which the WD has completed its epoch of mass gain and the time of the explosion. Matter ejected from the binary during mass transfer therefore has a chance to become diffuse, and the explosion occurs in a medium with a density similar to that of typical regions of the interstellar medium. Also, either by the end of the WD's mass increase or else by the time of explosion, the donor may exhaust its stellar envelope and become a WD. This alters, generally diminishing, explosion signatures related to the donor star. Nevertheless, the spin-up/spin-down model is highly predictive. Prior to explosion, progenitors can be super-$M_{Ch}$ WDs in either wide binaries with WD companions, or else in cataclysmic variables. These systems can be discovered and studied through wide-field surveys. Post explosion, the spin-up/spin-down model predicts a population of fast-moving WDs, low-mass stars, and even brown dwarfs. In addition, the spin-up/spin-down model provides a paradigm which may be able to explain both the similarities and the diversity observed among SNeIa.
Claeys J. S. W.
Di Stefano Rosanne
Voss Rasmus
No associations
LandOfFree
Spin-Up/Spin-Down models for Type Ia Supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin-Up/Spin-Down models for Type Ia Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin-Up/Spin-Down models for Type Ia Supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-557566