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Is there a mildly relativistic jet in SN2007gr?

Published online by Cambridge University Press:  24 February 2011

Z. Paragi ,
A. J. van der Horst ,
M. Tanaka ,
G. B. Taylor ,
C. Kouveliotou ,
J. Granot ,
E. Ramirez-Ruiz ,
Y. Pidopryhora ,
S. Bourke  and
R. M. Campbell
...Show all authors
Z. Paragi
Affiliation:
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, the Netherlands
A. J. van der Horst
Affiliation:
NASA Postdoctoral Program Fellow, NASA/MSFC/ORAU, Huntsville, AL, USA
M. Tanaka
Affiliation:
Institute for the Physics and Mathemathics of the Universe, Univ. Tokyo, Kashiwa, Japan
G. B. Taylor
Affiliation:
University of New Mexico, Albuquerque, USA
C. Kouveliotou
Affiliation:
NASA/MSFC, Huntsville, AL, USA
J. Granot
Affiliation:
University of Hertfordshire, UK
E. Ramirez-Ruiz
Affiliation:
University of California, Santa Cruz, USA
Y. Pidopryhora
Affiliation:
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, the Netherlands
S. Bourke
Affiliation:
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, the Netherlands
R. M. Campbell
Affiliation:
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, the Netherlands
M. A. Garrett
Affiliation:
Netherlands Institute for Radio Astronomy (Astron), Dwingeloo, the Netherlands
H. J. van Langevelde
Affiliation:
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, the Netherlands
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Abstract

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SN2007gr was an ordinary type Ic supernova, with a hint of asymmetric explosion seen in the optical polarization spectrum. This type of SNe is occasionally associated with long duration gamma-ray bursts which generate ultra-relativistic jets; no relativistic outflows have yet been found by direct imaging in SNe Ib/c explosions. High resolution very long baseline interferometry (VLBI) data and simultaneous total radio flux density measurements indicated that SN2007gr has expanded mildly relativistically. We performed late time Westerbork Synthesis Radio Telescope (WSRT) observations to measure the level of the underlying extended emission. Comparison of the VLBI and the background-subtracted WSRT and independent VLA data indicate an at least partially resolved source with an average expansion velocity of ≥0.4c, although the VLBI data could be consistent with a fainter source with an expansion velocity of ~0.2c as well.

Keywords

supernovae: generalsupernovae: individual (SN 2007gr)ISM: jets and outflowsradio continuum: generaltechniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 319 - 320
Copyright
Copyright © International Astronomical Union 2011

References

Paragi, Z., Taylor, G. B., Kouveliotou, C. et al. 2010, Nature, 463, 516CrossRefGoogle Scholar
Soderberg, A. M., Brunthaler, A., Nakar, E. et al. 2010, arXiv, 1005.1932Google Scholar
Tanaka, M., Kawabata, K. S., Maeda, K., Hattori, T., Nomoto, K., 2008, ApJ, 689, 1191CrossRefGoogle Scholar