Structures and Expansions of SN 1993J and SN 2004et

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Supernovae, Radio Emission, Vlbi

Scientific paper

Radio emission has been detected from a small subset of supernovae. For those radio supernovae that are strong radio emitters and are not too distant (≤20 Mpc) VLBI observations have been performed and, in some cases, high angular resolution images obtained. Thanks to VLBI observations, source structures and expansion decelerations have been determined. Together with multi-wavelength light curves and optical spectra, these observations have helped characterize the supernova ejecta and the circumstellar medium density profiles. We report on VLBI observations of SN1993J and SN2004et. In the case of supernova SN~1993J, the details of the expansion have been determined with astonishing detail. In the case of supernova SN~2004et, the last radio supernova imaged with VLBI, some considerations about the physical conditions in which this supernova evolves are made.

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