Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..556..338w&link_type=abstract
EXPLOSIVE PHENOMENA IN ASTROPHYSICAL COMPACT OBJECTS: First KIAS Astrophysics Workshop. AIP Conference Proceedings, Volume 556,
Astronomy and Astrophysics
Astrophysics
Late Stages Of Stellar Evolution
Scientific paper
The possible physical processes, associated timescales, and energetics are outlined that could lead to the production of pulsars, jets, and asymmetric supernovae, in routine circumstances and to a magnetar in more extreme circumstances in the collapse of the bare core of a massive star. A LeBlanc-Wilson MHD jet would be formed promptly, but requires 5 to 10 s to reach the surface of the progenitor of a Type Ib/c supernova. During this time, the newly-born neutron star could contract, spin up, and wind up field lines or turn on an α-Ω dynamo. The infalling matter could be subject to strong torques. In addition, the light cylinder will contract from a radius large compared to the Alfvén radius to a size comparable to that of the neutron star. This will disrupt the structure of any organized dipole field and promote the generation of ultrarelativistic MHD waves at high density and large amplitude electromagnetic waves at low density. The generation of these waves would be delayed by the cooling time of the neutron star about 1 to 10 seconds, but the propagation time is short so the MHD waves could arrive at the surface at about the same time as the original jet. These processes could account for the ubiquitous bipolar asymmetries revealed by supernova spectropolarimetry. .
Höflich Peter
Wang Lanjuan
Wheeler Justin C.
Yi Insu
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