A mildly relativistic radio jet from the otherwise normal Type Ic Supernova 2007gr
Z. Paragi (1, 2), G. B. Taylor (3), C. Kouveliotou (4), J. Granot, (5), E. Ramirez-Ruiz (6), M. Bietenholz (7, 8), A. J. van der Horst (4),, Y. Pidopryhora (1), H. J. van Langevelde (1, 10), M. A. Garrett (9, 10,, 11), A. Szomoru (1), M. Argo (12), S. Bourke (1)

TL;DR
This paper reports the discovery of a mildly relativistic radio jet in the normal Type Ic supernova SN 2007gr, revealing that such supernovae can produce low-energy relativistic outflows despite typical optical velocities.
Contribution
It provides the first evidence of a mildly relativistic jet in a normal Type Ic supernova, expanding understanding of supernova explosion mechanisms and jet formation.
Findings
Detected expansion velocity of at least 0.6c in SN 2007gr
Radio observations reveal a mildly relativistic bipolar jet
Optical data show typical supernova velocities (~6000 km/s)
Abstract
The class of type Ic supernovae have drawn increasing attention since 1998 owing to their sparse association (only four so far) with long duration gamma-ray bursts. Although both phenomena originate from the core collapse of a massive star, supernovae emit mostly at optical wavelengths, whereas GRBs emit mostly in soft gamma-rays or hard X-rays. Though the GRB central engine generates ultra-relativistic jets, which beam the early emission into a narrow cone, no relativistic outflows have hitherto been found in type Ib/c supernovae explosions, despite theoretical expectations and searches. Here we report radio (interferometric) observations that reveal a mildly relativistic expansion in a nearby type Ic supernova, SN 2007gr. Using two observational epochs 60 days apart, we detect expansion of the source and establish a conservative lower limit for the average apparent expansion velocity…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
