Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346909p&link_type=abstract
American Astronomical Society, AAS Meeting #213, #469.09; Bulletin of the American Astronomical Society, Vol. 41, p.419
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Using a sample that is larger than used before, and yet more diverse, we show that Type II-plateau supernovae (SNe II-P) can be calibrated using the simple brightness to photospheric-velocity correlation presented by Hamuy & Pinto (2002), yielding a tight Hubble diagram, with a dispersion of 10% in distance, comparable to SNe Ia. We show that the descendant method of Nugent et al. (2006), might be further simplified as the correction for dust extinction has low statistical impact. This suggests that a distance measurement could be obtained with a single spectrum of a SN II-P combined with rest-frame I-band photometry at a similar time. If dust correction is applied, the best solution implies a very steep dust law, with RV < 2, as recently found for many Type Ia SNe. In addition, SNe 2003hl and 2003iq that both exploded in the same host galaxy NGC0772, give consistent distances, if a low value for RV is assumed.
Bloom Jonathan
Butler Nat
Cenko Brad
Filippenko Alexei
Gal-Yam Avishay
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