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Type II Supernovae as Standardized Candles
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We present evidence for a correlation between expansion velocities of the ejecta of Type II plateau supernovae and their bolometric luminosities during the plateau phase. This correlation permits one to standardize the candles and decrease the scatter in the Hubble diagram from ~1 mag to a level of 0.4 and 0.3 mag in the V and I bands, respectively. When we restrict the sample to the eight objects which are well in the Hubble flow (cz > 3,000 km/s) the scatter drops even further to only 0.2 mag (or 9% in distance), which is comparable to the precision yielded by Type Ia supernovae and far better than the ``expanding photosphere method'' applied to Type II supernovae. Using SN 1987A to calibrate the Hubble diagrams we get Ho=55+/-12.
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Cited by 2 Pith papers
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Expanding Ejecta Method: I. Mapping Supernova Morphology with Intensity Interferometry
The expanding ejecta method extracts supernova morphology and angular diameter distance from spectrally resolved intensity interferometry, forecasting ~2% distance precision for a magnitude-12 Type IIP supernova in 60 hours.
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SN 2022xus: bridging the gap between Type IIP and IIL supernovae
SN 2022xus is a transitional Type II supernova with a 94.8-day plateau, a decline rate of 1.23 mag per 100 days, mixed IIP/IIL spectral features, and a likely 12-15 solar-mass progenitor.
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