Volume 404, Number 3, June IV 2003
|Page(s)||1077 - 1086|
|Section||Stellar structure and evolution|
|Published online||06 June 2003|
Light curves and Hα luminosities as indicators of Ni mass in type IIP supernovae
SISSA / ISAS, via Beirut 4, 34014 Trieste, Italy
2 Institute of Astronomy RAS, Pyatnitskaya 48, 109017 Moscow, Russia
3 Osservatorio Astronomico di Trieste, Via G.B.Tiepolo 11, 34131 Trieste, Italy
Corresponding author: A. Elmhamdi, email@example.com
Accepted: 4 April 2003
The possibility is investigated that the Hα luminosity at the nebular epoch may be an additional indicator of 56Ni mass in type II supernovae with plateau (SNe IIP), on the basis of available photometry and spectra. We first derive the 56Ni mass from the MV magnitude on the radioactive tail using a standard approach. A confirmation of the correlation between 56Ni mass and plateau MV magnitude found recently by Hamuy (2003) is evident. There is strong evidence of a correlation between steepness of the V light curve slope at the inflection time and the 56Ni mass. If confirmed, this relation may provide distance and extinction independent estimates of the amount of 56Ni in SNe IIP. We then apply upgraded radioactive models of Hα luminosity at the nebular epoch and claim that it may be a good indicator of 56Ni, if mass, energy and mixing properties vary moderately (within factor ~1.4) among SNe IIP. This method of the 56Ni mass determination from Hα luminosities yields results which are consistent with the photometric mass of 56Ni mass to within 20%. This result also implies that the parameters of SNe IIP events (mass, energy and mixing properties) are rather similar among the majority of SNe IIP, except for rare cases of SN II intermediate between IIP and IIL (linear), of which SN 1970G is an example.
Key words: supernovae: general / nuclear reactions, nucleosynthesis, abundances / techniques: photometric / techniques: spectroscopic
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.