Supernovae and the Origin of Dust in Galaxies

Details Supernovae and the Origin of Dust in Galaxies Supernovae and the Origin of Dust in Galaxies

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3333b&link_type=abstract

Spitzer Proposal ID #3333

Computer Science

Scientific paper

We propose to use IRAC and MIPS to carry out a sensitive mid-IR survey for thermal dust emission from 30 nearby extragalactic supernovae (SNe) discovered between April 1999 and January 2004. The goal is to find evidence for dust formation and spectral evolution in the SN ejecta and to determine the masses of dust that have been formed, in order to quantify for the first time the contribution by SNe to the dust cycle of galaxies. Our estimates for the mid-IR brightnesses of our targets are conservatively based upon SN 1987A, which formed modest amounts of dust and whose emission peaked in the mid-IR. For each target we will use an IRAC AOR of 1574s, yielding 600s per pixel in all four bands, together with a MIPS 24-micron AOR of 2639s, yielding an exposure time per pixel of 2*1088s. The IRAC and MIPS observations will yield comparable image fov's of 5x5 arcmin. The IRAC observations are capable of detecting SN1987A-type events between 3.6 and 8.0 microns to distances of up to 25 Mpc, while the MIPS observations could detect SN 1987A at 24 microns out to distances of 15 Mpc. The 30 SNe that have been selected have distances of less than 25 Mpc and consist of 23 massive-star SNe (16 Type II, 7 Type Ib/c) and 7 low-mass Type Ia SNe. The 28 IRAC and MIPS fields needed to cover the 30 SNe require a total of 32.8 hours of observing time. Our team comprises experienced IR observers, together with experts on supernovae, dust grain characteristics, and mass loss from evolved stars, The team members have extensive accumulated experience in the analysis of thermal IR spectra to derive the properties and masses of emitting dust and have available to them several state-of-the-art dust radiative transfer codes, including ones developed by members of the team. We have an approved high-priority 2004/5 8-m Gemini programme, to obtain high angular resolution mid-IR imaging of recent SNe, which will enhance and complement the current proposal.

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