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Jeonghee Rho |
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"Dust Formation Observed in
Young Supernova Remnants with Spitzer" |
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I present dust features and masses observed in young supernova remnants (SNRs) with Spitzer Infrared Spectrograph (IRS) mapping and staring observations of a few youngest supernova remnants including Cas A and
SNR 1E102.2-7219 (E0102). The spectral mapping data revealed a number of
dust features which include 21 micron-peak dust and featureless dust in
Cas A and 18-micron peak dust in E0102 and N132D. The 18 micron-peak
feature is fitted by a mix of MgSiO3 and solid Si dust grains, while the
21-micron peak dust is by a mix of silicates and FeO; we also explore
dust fitting using Continuous Distribution of Ellipsoid grain models. We
report detection of CO fundamental band from Cas A in near-infrared. We
review dust features observed and identified in other SNRs. The dust
emission is spatially correlated with the ejecta emission, showing dust
is formed in SN ejecta. The spectra of E0102 show rich gas lines from
ejecta including strong ejecta lines of Ne and O, including two [Ne III]
lines and two [Ne V] lines which allow us to diagnostic density and
temperature of the ejecta and measure the ejecta masses. I discuss
compositions and masses of dust and association with those of ejecta and
finally, dust contribution from SNe to early Universe. |