Deceleration in the Expansion of SN1993J

Details Deceleration in the Expansion of SN1993J Deceleration in the Expansion of SN1993J

1997-08-28

arxiv.org/abs/astro-ph/9708262v1

Astrophys.J. 486 (1997) L31

Astronomy and Astrophysics

Astrophysics

to appear in Astrophysical Journal Letters 10 pages of text, three figures (two of them in postscript format, one in gif forma

Scientific paper

10.1086/310830

A rarity among supernova, SN 1993J in M81 can be studied with high spatial resolution. Its radio power and distance permit VLBI observations to monitor the expansion of its angular structure. This radio structure was previously revealed to be shell-like and to be undergoing a self-similar expansion at a constant rate. From VLBI observations at the wavelengths of 3.6 and 6 cm in the period 6 to 42 months after explosion, we have discovered that the expansion is decelerating. Our measurement of this deceleration yields estimates of the density profiles of the supernova ejecta and circumstellar material in standard supernova explosion models.

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