Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-10-25
Astronomy and Astrophysics
Astrophysics
17 pages, LaTeX, 8 postscript figures, uses epsf.sty. To appear in ApJ 473 (Letters), 1996 December 10
Scientific paper
10.1086/310404
Two-dimensional hydrodynamical simulations of the deleptonization of a newly formed neutron star were performed. Driven by negative lepton fraction and entropy gradients, convection starts near the neutrinosphere about 20-30 ms after core bounce, but moves deeper into the protoneutron star, and after about one second the whole protoneutron star is convective. The deleptonization of the star proceeds much faster than in the corresponding spherically symmetrical model because the lepton flux and the neutrino luminosities increase by up to a factor of two. The convection below the neutrinosphere raises the neutrinospheric temperatures and mean energies of the emitted neutrinos by 10-20%. This can have important implications for the supernova explosion mechanism and changes the detectable neutrino signal from the Kelvin-Helmholtz cooling of the protoneutron star. In particular, the enhanced electron neutrino flux relative to the electron antineutrino flux during the early post-bounce evolution might solve the overproduction problem of certain elements in the neutrino-heated ejecta in models of type-II supernova explosions.
Janka Hans-Thomas
Keil Wolfgang
M"uller Ewald
No associations
LandOfFree
Ledoux-Convection in Protoneutron Stars --- a Clue to Supernova Nucleosynthesis? 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 Ledoux-Convection in Protoneutron Stars --- a Clue to Supernova Nucleosynthesis?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ledoux-Convection in Protoneutron Stars --- a Clue to Supernova Nucleosynthesis? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-209456