Mid-infrared imaging of Supernova 1987A

Abstract

At a distance of 50 kpc, Supernova 1987A is an ideal target to study how a young supernova (SN) evolves in time. Its equatorial ring, filled with material expelled from the progenitor star about 20,000 years ago, has been engulfed with SN blast waves. Shocks heat dust grains in the ring, emitting their energy at mid-infrared (IR) wavelengths We present ground-based 10--18$\mu$m monitoring of the ring of SN 1987A from day 6067 to 12814 at a resolution of 0.5", together with SOFIA photometry at 10-30 $\mu$m. The IR images in the 2000's (day 6067-7242) showed that the shocks first began brightening the east side of the ring. Later, our mid-IR images from 2017 to 2022 (day 10952-12714) show that dust emission is now fading in the east, while it has brightened on the west side of the ring. Because dust grains are heated in the shocked plasma, which can emit X-rays, the IR and X-ray brightness ratio represent shock diagnostics. Until 2007 the IR to X-ray brightness ratio remained constant over time, and during this time shocks seemed to be largely influencing the east side of the ring. However, since then, the IR to X-ray ratio has been declining, due to increased X-ray brightness. Whether the declining IR brightness is because of dust grains being destroyed or being cooled in the post-shock regions will require more detailed modelling.

MNRAS accepted

References in corpus (20)

• A stubbornly large mass of cold dust in the ejecta of Supernova 1987A
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. I. Dust Properties and Insights into the Origin of the Submm Excess Emission
• Dust Destruction in the High-Velocity Shocks Driven by Supernovae in the Early Universe
• The dust mass in Cassiopeia A from a spatially resolved Herschel analysis
• Condensation of dust in the ejecta of type II-P supernovae
• The Triple-Ring Nebula around SN1987A: Fingerprint of a binary merger
• Destruction of Interstellar Dust in Evolving Supernova Remnant Shock Waves
• High angular resolution ALMA images of dust and molecules in the SN 1987A ejecta
• Chandra Observes the End of an Era SN 1987A
• Interstellar and Ejecta Dust in the Cas A Supernova Remnant
• NS 1987A in SN 1987A
• The Destruction of the Circumstellar Ring of SN 1987A
• Three-dimensional distribution of ejecta in Supernova 1987A at 10 000 days
• Infrared and X-Ray Evidence for Circumstellar Grain Destruction by the Blast Wave of Supernova 1987A
• Spectral and morphological analysis of the remnant of Supernova 1987A with ALMA & ATCA
• High-resolution radio observations of SNR 1987A at high frequencies
• The matter beyond the ring: the recent evolution of SN 1987A observed by the Hubble Space Telescope
• Revisiting the dust destruction efficiency of supernovae
• Final Spitzer IRAC Observations of the Rise and Fall of SN 1987A
• The morphology of the ejecta of SN 1987A at 31 years from 1150 to 10000 Å

Cited by in corpus (1)

• JWST NIRSpec observations of Supernova 1987A -- from the inner ejecta to the reverse shock