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RESEARCH PRODUCT
Imaging of SN 1993J
A. AlberdiJ.m. Marcaidesubject
PhysicsSpectral indexDeceleration parameterShock (fluid dynamics)Excited stateVery-long-baseline interferometryAstrophysicsCircular symmetryEnvelope (waves)description
SN 1993J has been imaged with VLBI, and its angular expansion monitored, for almost ten years. The images show shell-like radio structures with almost circular symmetry. SN 1993J expands according to models of shock excited emission. The angular expansion has a changing deceleration rate and is best modeled with two different slopes. The swept-up mass estimate at an age of 3159 days (∼0.4 M⨀), comparable to the low-mass envelope, favors a binary scenario. The observed spectral index of SN 1993J has slowly flattened since age 1000 days onward (α has changed from −1 to −0.67 at an age of 2820 days).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-11-21 |