VLBI Observations of the Nearby Type IIb Supernova 2011dh

Details VLBI Observations of the Nearby Type IIb Supernova 2011dh VLBI Observations of the Nearby Type IIb Supernova 2011dh

2012-01-03

arxiv.org/abs/1201.0771v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

8 pages; accepted to Astrophysical Journal

Scientific paper

We report on phase-referenced VLBI radio observations of the Type IIb supernova 2011dh, at times t = 83 days and 179 days after the explosion and at frequencies, respectively, of 22.2 and 8.4 GHz. We detected SN 2011dh at both epochs. At the first epoch only an upper limit on SN 2011dh's angular size was obtained, but at the second epoch, we determine the angular radius SN 2011dh's radio emission to be 0.25 +- 0.08 mas by fitting a spherical shell model directly to the visibility measurements. At a distance of 8.4 Mpc this angular radius corresponds to a time-averaged (since t=0) expansion velocity of the forward shock of 21000 +- 7000 km/s. Our measured values of the radius of the emission region are in excellent agreement with those derived from fitting synchrotron self-absorbed models to the radio spectral energy distribution, providing strong confirmation for the latter method of estimating the radius. We find that SN 2011dh's radius evolves in a power-law fashion, with R proportional to t^(0.92 +- 0.10).

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