Late time IR emission from an extremely luminous Type IIn supernova: SN 2005ip

Details Late time IR emission from an extremely luminous Type IIn supernova: SN 2005ip Late time IR emission from an extremely luminous Type IIn supernova: SN 2005ip

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50256f&link_type=abstract

Spitzer Proposal ID #50256

Computer Science

Scientific paper

Near-Infrared (NIR) observations of SN 2005ip in NGC2906 reveal a Type IIn event that has remained extremely luminous (>1.6 mJy) in K-band for over two years. Type IIn supernovae have strong narrow emission lines at early times due to a dense circumstellar medium formed by the progenitor wind. The rates for Type IIn SNe indicate that the chance of a closer, brighter Type IIn event being detected within the next year is very small. While the late-time K-band emission of SN 2005ip can be attributed to warm dust, the heating source of that dust is ambiguous. SN 2005ip is unique in that it is a Type IIn event that is at the right point in its evolution for a late-time study of its IR excess. The SN is sufficiently bright and provides good IRS SNR. With just 15 minutes of integration in IRS SL1/2, spectra are capable of identifying the dust composition and disentangling the dust heating source, from which the nature of the progenitor system may also be deduced. Considering late-time emission scenarios require year long time-scales before they can be characterized, this opportunity is most likely the last for Spitzer to obtain an IRS emission spectrum of such a bright, well-sampled Type IIn event.

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