Massive Star CSI: Has The Progenitor of SN2008S Vanished?

Details Massive Star CSI: Has The Progenitor of SN2008S Vanished? Massive Star CSI: Has The Progenitor of SN2008S Vanished?

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70040k&link_type=abstract

Spitzer Proposal ID #70040

Computer Science

Scientific paper

SN2008S in NGC6946 is the prototype of a new class of optical transients. Its luminosity was low for a Type II supernova, and the progenitor star was identified as a completely dust obscured log(L/Lsun)=4.5, T=440K massive star (~10 Msun) in archival Spitzer data. It is uncertain whether this is a new class of low-luminosity supernova (e.g. an electron capture supernova) or a new class of massive star outburst. The transient has now faded to the point where the source is again invisible in the optical. Near-IR detections are consistent with a somewhat hotter source, T~1200K, somewhat brighter than the progenitor and still fading at ~3 mag/year. Using two epochs of IRAC observations to constrain the mid-IR emission, and two epochs of HST H-band observations to constrain emission from cool stars, we will solve this mystery by either identifying and characterizing the surviving progenitor or ruling out its survival.

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