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Panchromatic Observations of SN2011dh Point to a Compact Progenitor StarWe report the discovery and detailed monitoring of X-ray emission associated with the Type IIb SN2011dh using data from the Swift and Chandra satellites, placing it among the best studied X-ray supernovae to date. We further present millimeter and radio data obtained with the SMA, CARMA, and EVLA during the first three weeks after explosion. Combining these observations with early optical photometry, we show that the panchromatic dataset is well-described by non-thermal synchrotron emission (radio/mm) with inverse Compton scattering (X-ray) of a thermal population of optical photons. We derive the properties of the shockwave and the circumstellar environment and find a time-averaged shock velocity of v approximately equals 0.1c and a progenitor mass loss rate of M-dot approximately equals 6 X 10 (exp 5) Solar M/ yr (wind velocity, v(sub w) = 1000 km/s). We show that these properties are consistent with the sub-class of Type IIb supernovae characterized by compact progenitors (Type cIIb) and dissimilar from those with extended progenitors (Type eIIb). Furthermore, we consider the early optical emission in the context of a cooling envelope model to estimate a progenitor radius of R(sub star) approximately equals 10(exp 11) cm, in line with the expectations for a Type cIIb supernova. Together, these diagnostics suggest that the putative yellow supergiant progenitor star identified in archival HST observations is instead a binary companion or unrelated to the supernova. Finally, we searched for the high energy shock breakout pulse using X-ray and gamma-ray observations obtained during the purported explosion date range. Based on the compact radius of the progenitor, we estimate that the shock breakout pulse was detectable with current instruments but likely missed due to their limited temporal/ spatial coverage. Future all-sky missions will regularly detect shock breakout emission from compact SN progenitors enabling prompt follow-up observations of the shockwave with the EVLA and ALMA.
Document ID
20120002552
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Soderberg, A. M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Margutti, R. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Zauerer, B. A. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Krauss, M. (National Radio Astronomy Observatory Socorro, NM, United States)
Katz, B. (Institute for Advanced Study Princeton, NJ, United States)
Chomiuk, L. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Dittmann, J. A. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Nakar, E. (Tel-Aviv Univ. Israel)
Sakamoto, T. (Maryland Univ. Baltimore County Baltimore, MD, United States)
Kawai, N. (Tokyo Inst. of Tech. Tokyo, Japan)
Hurley, K. (California Univ. Berkeley, CA, United States)
Barthelmy, S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Toizumi, T. (Tokyo Inst. of Tech. Tokyo, Japan)
Morii, M. (Tokyo Inst. of Tech. Tokyo, Japan)
Chevalier, R. A. (Virginia Univ. Charlottesville, VA, United States)
Gurwell, M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Petitpas, G. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Rupen, M. (National Radio Astronomy Observatory Socorro, NM, United States)
Alexander, T. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Levesque, E. M. (Colorado Univ. Boulder, CO, United States)
Fransson, C. (Stockholm Univ. Sweden)
Brunthaler. A. (National Radio Astronomy Observatory Socorro, NM, United States)
Bietenholz, M. F. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Chugai, N. (Academy of Sciences (Russia) Moscow, Russian Federation)
Cline, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
July 11, 2011
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.5652.2011
Funding Number(s)
CONTRACT_GRANT: NNX07AR71G
CONTRACT_GRANT: NNX10AI23G
CONTRACT_GRANT: NAS8-03060
CONTRACT_GRANT: NNX09AU03G
CONTRACT_GRANT: NNX10AR12G
Distribution Limits
Public
Copyright
Public Use Permitted.

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