Rescued from oblivion: detailed analysis of archival {\it Spitzer} data of SN~1993J

Abstract

We present an extensive analysis of the late-time mid-infrared (mid-IR) evolution of Type IIb SN 1993J from 10 up to 26 years post-explosion based on archival $-$ mostly previously unpublished $-$ photometric data of Spitzer Space Telescope in conjunction with an archival IRS spectrum. SN 1993J is one of the best-studied supernovae (SNe) with an extensive, decade-long multi-wavelength dataset published in various papers; however, its detailed late-time mid-IR analysis is still missing from the literature. Mid-IR data follows not just the continuously cooling SN ejecta but also late-time dust formation and circumstellar interaction processes. We provide evidence that the observed late-time mid-IR excess of SN 1993J can be described by the presence of two-component local dust with a dust mass of $\sim (3.5-6.0)\times 10^{-3}{M}_{\odot }$ in case of a partly silicate-based dust composition. Source of these components can be either newly-formed dust grains, or heating of pre-existing dust via ongoing CSM interaction detected also at other wavelengths. If it is newly-formed, dust is assumed to be located both in the unshocked inner ejecta and in the outer cold dense shell, just as found in the Cassiopeia A remnant and also assumed in other dust-forming SNe in a few years after explosion.

13 pages, 6 figures, 2 tables. Accepted for publication in MNRAS

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Cited by in corpus (4)

• Dust masses for a large sample of core-collapse supernovae from optical emission line asymmetries: dust formation on 30-year timescales
• The Late Time Optical Evolution of Twelve Core-Collapse Supernovae: Detection of Normal Stellar Winds
• Supernovae double-peaked light curves from double-nickel distribution
• JWST/MIRI detects the dusty SN1993J about 30 years after explosion