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Astronomers observed rapid optical flares from the AT2022tsd transient, suggesting a powerful, compact energy source. This finding supports the idea that some extragalactic optical transients are powered by magnetars or accreting black holes.

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Area of Science:

  • Astronomy and Astrophysics
  • High-Energy Astrophysics
  • Transient Events

Background:

  • Luminous extragalactic optical transients lasting only days differ from typical supernovae.
  • AT2018cow-like transients exhibit blue colors and strong radio/X-ray emission, hinting at unique energy sources.
  • Previous observations suggested embedded energy sources in AT2018cow-like transients, including X-ray variability and UV emission.

Purpose of the Study:

  • To investigate the nature of the AT2018cow-like transient AT2022tsd.
  • To characterize the energetic phenomena following the AT2022tsd event.
  • To confirm the presence and type of compact object powering these transients.

Main Methods:

  • Observation of optical flares from AT2022tsd over several months.
  • Analysis of flare duration, energy, and spectral properties.
  • Comparison with known transient phenomena and theoretical models.

Main Results:

  • Discovery of minutes-duration optical flares in the aftermath of AT2022tsd.
  • Flares were highly energetic and likely nonthermal in origin.
  • Evidence points towards a near-relativistic outflow or jet from the transient source.

Conclusions:

  • The observed flares confirm a compact energy source for AT2022cow-like transients.
  • The energy source is likely a magnetar or an accreting black hole.
  • These findings advance our understanding of short-duration extragalactic optical transients.