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Determination of the explosion type of supernova remnants (SNRs) can bechallenging, as SNRs are hundreds to thousands of years old and supernovae(SNe) are classified based on spectral properties days after explosion.Previous studies of thermal X-ray emission from Milky Way and Large MagellanicCloud (LMC) SNRs have shown that Type Ia and core-collapse (CC) SNRs havestatistically different symmetries, and thus these sources can be typed basedon their X-ray morphologies. In this paper, we extend the same technique, amultipole expansion technique using power ratios, to infrared (IR) images ofSNRs to test whether they can be typed using the symmetry of their warm dustemission as well. We analyzed archival Spitzer Space Telescope MultibandImaging Photometer (MIPS) 24 micron observations of the previously used X-raysample, and we find that the two classes of SNRs separate according to their IRmorphologies. The Type Ia SNRs are statistically more circular and mirrorsymmetric than the CC SNRs, likely due to the different circumstellarenvironments and explosion geometries of the progenitors. Broadly, our workindicates that the IR emission retains information of the explosive origins ofthe SNR and offers a new method to type SNRs based on IR morphology.

Constraining Explosion Type of Young Supernova Remnants Using 24 Micron Emission Morphology