期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 436, 期 2, 页码 1258-1267出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1645
关键词
supernovae: general; supernovae: individual: SN 2011dh; radio continuum: general; X-rays: general
资金
- National Science Foundation
- CARMA partner universities
- NSF [AST-0908886, AST-1211916]
- NASA
- Israeli Science Foundation
- BSF
- NASA Wisconsin Space Grant Consortium
- CONICYT, Chile [FONDECYT 1101024, FONDAPCATA 15010003]
- Programa de Financiamiento Basal
- Iniciativa Cientifica Milenio through the Millennium Center for Supernova Science [P10-064-F]
- Chandra X-ray Center [SAO GO9-0086D, GO0-11095A]
- Hubble Fellowship
- Carnegie-Princeton Fellowship
- STScI-DDRF
- Office of Naval Research
- Gary AMP
- Cynthia Bengier
- Richard AMP
- Rhoda Goldman Fund
- Sylvia AMP
- Jim Katzman Foundation
- Christopher R. Redlich Fund
- TABASGO Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1139950, 1140019] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1140063, 1009987, 1140031] Funding Source: National Science Foundation
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 (epsilon(e)/epsilon(B) similar to 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 (similar to 1 d) high-frequency observations of future events. Moreover, we show the importance of combined radio/X-ray observations for determining the microphysics ratio epsilon(e)/epsilon(B).
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