Optical And Infrared Analysis Of Type II SN 2006bc

Details Optical And Infrared Analysis Of Type II SN 2006bc Optical And Infrared Analysis Of Type II SN 2006bc

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733722g&link_type=abstract

American Astronomical Society, AAS Meeting #217, #337.22; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present nebular phase optical imaging and spectroscopy and near-IR and mid-IR imaging of the Type II SN 2006bc. Observations reveal the central wavelength of the symmetric H-alpha line profile to be blue-shifted with respect to the galactic H-alpha emission by day 325. This is likely due to an asymmetric explosion in the iron-peak elements resulting in a larger mass of 56NI and higher excitation of hydrogen on the near side of the SN explosion. We also observe a gradual blue-shifting of this H-alpha peak that could be indicative of dust formation in the ejecta. Radiative transfer modeling in currently underway to quantify the amount and composition of dust formed during this SN event. Although showing a normal peak brightness, V -17.2, for a core-collapse SN, 2006bc fades by 6 mag during the first 400 days suggesting either a relatively low 56Ni yield, an increase in extinction due to new dust, or both. A short duration flattening of the light curve is observed from day 416 to day 541 suggesting an optical light echo. Based on the narrow time window of this echo, we discuss implications on the location and geometry of the reflecting CSM.

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