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A 12.4-day periodicity in a close binary system after a supernova
Ping Chen1, Avishay Gal-Yam2, Jesper Sollerman3
1Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel. chen.ping@weizmann.ac.il.
Nature
|January 10, 2024
Summary
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.
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.
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