Unusual behavior in Radio Supernova SN 1993J

Details Unusual behavior in Radio Supernova SN 1993J Unusual behavior in Radio Supernova SN 1993J

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..937..331c&link_type=abstract

SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP Conference Proceedings, Volume 937, pp. 331-338 (2007).

Astronomy and Astrophysics

Astronomy

Supernovae, Radio, Microwave, Astronomical And Space-Research Instrumentation, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers

Scientific paper

Here we present two near-simultaneous spectra of a Type IIb supernova, SN 1993J taken around day ~3200 and ~3700, observed with the Giant Meterwave Radio Telescope (GMRT) and Very Large Array (VLA). We show the synchrotron cooling break in the optically thin part of both the spectra. Based on these two spectra 1.5 years apart, cooling break frequency seems to be evolving with time. We calculate the magnetic field evolution and put constraints on electron diffusion coefficient from the evolution in break frequency.

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