Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..243p&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Astronomy and Astrophysics
Astronomy
Scientific paper
We have imaged with VLBI the supernova SN1986J in NGC891 at 5 GHz, about 16 yr after its explosion. The image shows a distorted shell of radio emission, indicative of a strong deformation of the shock front. The shell is asymmetric, and we suggest that such asymmetry could be due to the collision of the supernova ejecta with an anisotropic, clumpy (or filamentary) medium. The average speed of the shell has decreased from ˜7400 km s-1 in 1988.74 down to about 6300 km s-1 in 1999.14, pointing to a mild deceleration in the expansion of SN 1986J. Assuming a standard density profile for the progenitor wind, the resulting mass swept-up by the shock front is ˜2.2 Modot. This large swept-up mass, coupled with the mild deceleration suffered by the supernova, suggests that the mass of the hydrogen-rich envelope ejected at explosion was as large as ˜12 Modot. Thus, the supernova progenitor must have kept intact most of its hydrogen-rich envelope by the time of explosion, which favors a single, massive star progenitor scenario.
Alberdi Antonio
Guirado Jose C.
Lara Liana
Mantovani Fabio
Marcaide Juan Maria
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