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Only a handful of supernovae (SNe) have been studied in multi-wavelength fromradio to X-rays, starting a few days after explosion. The early detection andclassification of the nearby type IIb SN2011dh/PTF11eon in M51 provides aunique opportunity to conduct such observations. We present detailed dataobtained at the youngest phase ever of a core-collapse supernova (days 3 to 12after explosion) in the radio, millimeter and X-rays; when combined withoptical data, this allows us to explore the early evolution of the SN blastwave and its surroundings. Our analysis shows that the expanding supernovashockwave does not exhibit equipartition (e_e/e_B ~ 1000), and is expandinginto circumstellar material that is consistent with a density profile fallinglike R^-2. Within modeling uncertainties we find an average velocity of thefast parts of the ejecta of 15,000 +/- 1800 km/s, contrary to previousanalysis. This velocity places SN 2011dh in an intermediate blast-wave regimebetween the previously defined compact and extended SN IIb subtypes. Ourresults highlight the importance of early (~ 1 day) high-frequency observationsof future events. Moreover, we show the importance of combined radio/X-rayobservations for determining the microphysics ratio e_e/e_B.

monthly notices of the royal astronomical society

An Early & Comprehensive Millimeter and Centimeter Wave and X-ray Study  of Supernova 2011dh: A Non-Equipartition Blastwave Expanding into A Massive  Stellar Wind