Is there a mildly relativistic jet in SN2007gr?

Z. Paragi, A. J. Van Der Horst, M. Tanaka, G. B. Taylor, C. Kouveliotou, Jonathan Granot, E. Ramirez-Ruiz, Y. Pidopryhora, S. Bourke, R. M. Campbell, M. A. Garrett, H. J. Van Langevelde

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationJets at All Scales
Subtitle of host publicationProceedings IAU Symposium No. 275, 2011
EditorsGustavo E. Romero, Rashid A. Sunyaev, Tomaso Belloni
PublisherCambridge University Press
Number of pages2
ISBN (Print)9780521766074
StatePublished - 1 Feb 2011
Externally publishedYes

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • ISM: jets and outflows
  • Radio continuum: general
  • Supernovae: general
  • Supernovae: individual (SN 2007gr)
  • Techniques: interferometric


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