Abstract
High energy emissions from supernovae (SNe), originated from newly formed radioactive species, provide direct evidence of nucleosynthesis at SN explosions. However, observational diculties in the MeV range have so far allowed the signal detected only from the extremely nearby core-collapse SN 1987A. No solid detection has been reported for thermonuclear SNe Ia, despite the importance of the direct conrmation of the formation of <sup>56</sup>Ni, which is believed to be a key ingredient in their nature as distance indicators. In this paper, we show that the new generation hard X-ray and soft gamma-ray instruments, on board Astro-H and NuStar, are capable of detecting the signal, at least at a pace of once in a few years, opening up this new window for studying SN explosion and nucleosynthesis.
Highlights
Supernova (SN) explosions trigger explosive nucleosynthesis, and they are believed to be main production sites of heavy elements in the Universe
While detecting the MeV lines from the 56Co decay has been challenged in the past, even with SPI on board INTEGRAL and 106 s exposure (Roques et al, 2003; see Isern et al, 2013), this is limited to extremely nearby SNe Ia up to 5 - 6 Mpc
With a standard set up with a few 105 s exposure, the detection will be limited to extremely nearby objects, but still there is a good chance of first solid detection of the signal from SNe Ia
Summary
Supernova (SN) explosions trigger (or are triggered by) explosive nucleosynthesis, and they are believed to be main production sites of heavy elements in the Universe. We extend our analysis to hard X-ray and soft γ-ray regimes, for which dramatic improvement is expected in the observational sensitivities thanks to new generation observatories like NuStar (Koglin et al, 2005) or Astro-H (Takahashi et al, 2010). We predict that these telescopes are capable of detecting the radioactive decay signals from SNe Ia, at a rate of once in a year or at least once in a few years. We briefly comment on perspectives for core-collapse SNe
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
