The Unusual Supernova 2002bo

Details The Unusual Supernova 2002bo The Unusual Supernova 2002bo

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.4504z&link_type=abstract

American Astronomical Society Meeting 203, #45.04; Bulletin of the American Astronomical Society, Vol. 35, p.1277

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In this project we have obtained UBVRI optical and JHK infrared photometry of the unusual Type Ia supernova 2002bo, which appeared in NGC 3190. Our dataset covers the time span from 11 days before until 44 days after the time of B-band maximum. We find a decline rate parameter of Δ m15(B) = 1.18 ± 0.04. We find the host galaxy reddening to be E(B-V) = 0.38 ± 0.03 mag. The Galactic reddening is E(B-V) = 0.025 mag. If it were not for the reddening and extinction, SN 2002bo would have been the brightest supernova of the past ten years.
We obtain a distance modulus of m-M = 31.64 ± 0.08. This does not compare well with the distance modulus of 32.66 ± 0.18 (Tonry et al. 2001), obtained from surface brightness fluctuations of the host galaxy. Alternately, we can derive the absolute magnitudes of SN 2002bo assuming that the SBF distance is correct. On an H0 = 74 scale we then obtain MB = -20.18 ± 0.21, MV = -20.29 ± 0.20, MI = -19.72 ± 0.18. The implication is that SN2002bo was a full magnitude more luminous than other Type Ia supernovae of comparable decline rate.

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