Fermi Large Area Telescope detection of gamma-ray emission from the direction of supernova iPTF14hls

Abstract

The remnant of supernova explosion is widely believed to be the acceleration site of high-energy cosmic ray particles. The acceleration timescale is, however, typically very long. Here we report the detection of a variable $\gamma$-ray source with the Fermi Large Area Telescope, which is positionally and temporally consistent with a peculiar supernova, iPTF14hls. A quasi-stellar object SDSS J092054.04+504251.5, which is probably a blazar according to the infrared data, is found in the error circle of the $\gamma$-ray source. More data about the $\gamma$-ray source and SDSS J092054.04+504251.5 are needed to confirm their association. On the other hand, if the association between the $\gamma$-ray source and the supernova is confirmed, this would be the first time to detect high-energy $\gamma$-ray emission from a supernova, suggesting very fast particle acceleration by supernova explosions.

12 pages, 5 figures; accepted for publication in ApJL

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• Core-collapse supernovae in dense environments -- particle acceleration and non-thermal emission
• A fallback accretion model for the unusual type II-P supernova iPTF14hls
• The first days of type II-P core collapse supernovae in the gamma-ray range
• iPTF14hls in the circumstellar medium interaction model: A promising candidate for a pulsational pair-instability supernova
• Search for gamma rays from SNe with a variable-size sliding-time-window analysis of the Fermi-LAT data
• VERITAS and Fermi-LAT constraints on the Gamma-ray Emission from Superluminous Supernovae SN2015bn and SN2017egm
• A Very-High-Energy Gamma-Ray View of the Transient Sky
• Quantifying the dust in SN 2012aw and iPTF14hls with ORBYTS
• Gamma-ray signature of superluminous supernovae: Fermi-LAT GeV detection of SN 2017egm and evidence of a central engine
• Evidence for GeV emission of the superluminous supernova SN 2017egm
• Interacting supernovae and where to find them
• Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor. Multiwavelength observations and analysis of the progenitor