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Astronomers observed supernova SN 2022jli, revealing periodic light changes and hydrogen emissions. This suggests a massive star in a binary system exploded, leaving a compact object accreting material from its companion.

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Area of Science:

  • Astronomy and Astrophysics
  • Stellar Evolution
  • Supernovae

Background:

  • Neutron stars and stellar-mass black holes form from massive star explosions.
  • Massive stars often exist in binary systems, but direct evidence of compact object formation during supernovae in binaries is scarce.

Purpose of the Study:

  • To investigate the nature of the stripped-envelope supernova SN 2022jli.
  • To search for signatures of binarity and compact object formation in supernova remnants.

Main Methods:

  • Photometric monitoring of SN 2022jli to detect light curve variations.
  • Spectroscopic analysis of late-time emissions, including Hα.
  • Correlation with gamma-ray source data from Fermi-LAT.

Main Results:

  • SN 2022jli exhibited 12.4-day periodic undulations in its declining light curve.
  • Late-time spectra showed narrow Hα emission with periodic velocity shifts, indicating accretion onto a compact remnant.
  • A new Fermi-LAT gamma-ray source was found to be consistent with SN 2022jli's location and timing.

Conclusions:

  • The observed properties strongly suggest SN 2022jli resulted from a massive star in a binary system.
  • The compact remnant is accreting mass from its companion, powering the supernova's light curve and generating gamma-ray emission.