Deceleration in the expansion of SN 1993J

DOI: 
Publication date: 
01/01/1997
Main author: 
Marcaide J.M.
IAA authors: 
Alberdi A.
Authors: 
Marcaide J.M., Alberdi A., Ros E., Diamond P., Shapiro I.I., Guirado J.C., Jones D.L., Mantovani F., Pérez-Torres M.A., Preston R.A., Schilizzi R.T., Sramek R.A., Trigilio C., Van Dyk S.D., Weiler K.W., Whitney A.R.
Journal: 
Astrophysical Journal
Publication type: 
Article
Volume: 
486
Pages: 
L31-L34
Number: 
Abstract: 
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 wavelengths of 3.6 and 6 cm in the period 6-42 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. © 1997. The American Astronomical Society. All rights reserved.
Database: 
SCOPUS
Keywords: 
Circumstellar matter; Galaxies: individual (NGC 3031, M81); Radio continuum: stars; Supernovae: individual (SN 1993j); Techniques: interferometric