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Issue A&A
Volume 404, Number 3, June IV 2003
Page(s) 1077 - 1086
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030522



A&A 404, 1077-1086 (2003)
DOI: 10.1051/0004-6361:20030522

Light curves and H $\alpha$ luminosities as indicators of $\mathsf{^{56}}$Ni mass in type IIP supernovae

A. Elmhamdi1, N. N. Chugai2 and I. J. Danziger3

1  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

(Received 12 February 2003 / Accepted 4 April 2003 )

Abstract
The possibility is investigated that the H $\alpha$ 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 H $\alpha$ 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 H $\alpha$ 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

Offprint request: A. Elmhamdi, elmhamdi@sissa.it

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