TY - JOUR
T1 - An early and comprehensive millimetre and centimetre wave and X-ray study of SN 2011dh
T2 - A non-equipartition blast wave expanding into a massive stellar wind
AU - Horesh, Assaf
AU - Stockdale, Christopher
AU - Fox, Derek B.
AU - Frail, Dale A.
AU - Carpenter, John
AU - Kulkarni, S. R.
AU - Ofek, Eran O.
AU - Gal-Yam, Avishay
AU - Kasliwal, Mansi M.
AU - Arcavi, Iair
AU - Quimby, Robert
AU - Cenko, S. Bradley
AU - Nugent, Peter E.
AU - Bloom, Joshua S.
AU - Law, Nicholas M.
AU - Poznanski, Dovi
AU - Gorbikov, Evgeny
AU - Polishook, David
AU - Yaron, Ofer
AU - Ryder, Stuart
AU - Weiler, Kurt W.
AU - Bauer, Franz
AU - Van Dyk, Schuyler D.
AU - Immler, Stefan
AU - Panagia, Nino
AU - Pooley, Dave
AU - Kassim, Namir
PY - 2013/12
Y1 - 2013/12
N2 - Only a handful of supernovae (SNe) have been studied in multiwavelengths from the radio to X-rays, starting a few days after the explosion. The early detection and classification of the nearby Type IIb SN 2011dh/PTF 11eon in M51 provides a unique opportunity to conduct such observations. We present detailed data obtained at one of the youngest phase ever of a core-collapse SN (days 3-12 after the explosion) in the radio, millimetre and X-rays; when combined with optical data, this allows us to explore the early evolution of the SN blast wave and its surroundings. Our analysis shows that the expanding SN shock wave does not exhibit equipartition (εe/εB ~ 1000), and is expanding into circumstellar material that is consistent with a density profile falling like R-2. Within modelling uncertainties we find an average velocity of the fast parts of the ejecta of 15 000 ± 1800 km s-1, contrary to previous analysis. This velocity places SN 2011dh in an intermediate blast wave regime between the previously defined compact and extended SN Type IIb subtypes. Our results highlight the importance of early (~1 d) high-frequency observations of future events. Moreover, we show the importance of combined radio/X-ray observations for determining the microphysics ratio εe/εB.
AB - Only a handful of supernovae (SNe) have been studied in multiwavelengths from the radio to X-rays, starting a few days after the explosion. The early detection and classification of the nearby Type IIb SN 2011dh/PTF 11eon in M51 provides a unique opportunity to conduct such observations. We present detailed data obtained at one of the youngest phase ever of a core-collapse SN (days 3-12 after the explosion) in the radio, millimetre and X-rays; when combined with optical data, this allows us to explore the early evolution of the SN blast wave and its surroundings. Our analysis shows that the expanding SN shock wave does not exhibit equipartition (εe/εB ~ 1000), and is expanding into circumstellar material that is consistent with a density profile falling like R-2. Within modelling uncertainties we find an average velocity of the fast parts of the ejecta of 15 000 ± 1800 km s-1, contrary to previous analysis. This velocity places SN 2011dh in an intermediate blast wave regime between the previously defined compact and extended SN Type IIb subtypes. Our results highlight the importance of early (~1 d) high-frequency observations of future events. Moreover, we show the importance of combined radio/X-ray observations for determining the microphysics ratio εe/εB.
KW - Radio continuum:General - X-rays:General
KW - Supernovae:General
KW - supernovae:Individual:SN 2011dh
UR - http://www.scopus.com/inward/record.url?scp=84887586663&partnerID=8YFLogxK
U2 - 10.1093/mnras/stt1645
DO - 10.1093/mnras/stt1645
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AN - SCOPUS:84887586663
SN - 0035-8711
VL - 436
SP - 1258
EP - 1267
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -