The 2-year Checkup On 10 SNe IIn Discovered By Spitzer To Exhibit Late-time (>100 Day) IR Emission

Details The 2-year Checkup On 10 SNe IIn Discovered By Spitzer To Exhibit Late-time (>100 Day) IR Emission The 2-year Checkup On 10 SNe IIn Discovered By Spitzer To Exhibit Late-time (>100 Day) IR Emission

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924217d&link_type=abstract

American Astronomical Society, AAS Meeting #219, #242.17

Astronomy and Astrophysics

Astronomy

Scientific paper

Two years ago, a warm Spitzer survey of sixty-eight SNe IIn identified between the years 1998-2008 discovered 10 events with unreported late-time infrared (IR) excesses, in some cases more than 5 years post-explosion. These data nearly double the database of existing mid-IR observations of SNe IIn and offer important clues regarding the SN circumstellar environment, explosion mechanism, and even progenitor system. From this single epoch of data, along with ground-based optical data, we determined the likely origin of the mid-IR emission to be pre-existing dust continuously heated by optical emission generated by ongoing circumstellar interaction between the forward shock and circumstellar medium. Furthermore, an emerging trend suggests that these SNe decline at 1000--2000 days post-discovery once the forward shock overruns the dust shell. Here we present initial results from a follow-up warm Spitzer survey of the 10 SNe. These data allow us to constrain our models, including both the size of the circumstellar dust shell and progenitor mass-loss properties.

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