Issue |
A&A
Volume 460, Number 3, December IV 2006
|
|
---|---|---|
Page(s) | 769 - 776 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20065704 | |
Published online | 26 September 2006 |
Observations and analysis of two type IIP supernovae: the intrinsically faint object SN 2005cs and the ambiguous object SN 2005ay
1
Sternberg State Astronomical Institute, Universitetskii pr. 13, 119992 Moscow, Russia e-mail: tsvetkov@sai.msu.su; elmhamdi@ts.astro.it
2
SC “Ka-Dar”, Neopalimovskii 1st per. 16/13, 119121, Moscow, Russia
3
ICTP – International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy
4
INAF – Osservatorio Astronomico di Trieste, via G.B.Tiepolo 11, 34131 Trieste, Italy
Received:
26
May
2006
Accepted:
28
July
2006
Aims. To derive observational properties and physical parameters of the
progenitor stars of type IIP supernovae SN 2005ay and SN 2005cs from
their CCD photometry, and to define
their velocity behaviour.
Methods.Light curves are analysed, and the velocities and spectral characteristics of SN 2005cs are obtained using synthetic spectra modeling.
Results.Both supernovae are found to be fainter than the average
SN IIP, with SN 2005cs being more subluminous and showing slight
brightening in the second half of plateau stage in the
bands and a low expansion velocity.
The effects of two different plausible distance moduli on the
derived physical parameters of SN 2005ay are considered.
Two approaches are used to recover the amounts of the
ejected 56Ni, indicating masses of the order of
~0.02
, although late luminosities might indicate
a higher amount for SN 2005ay, especially for the large distance
case.
Constraints on the progenitor properties are also presented, based
on empirical analytical models. Two approaches are used
to estimate the expansion velocities at the middle of
the plateau phase. SN 2005cs represents an example of where all 3 physical
parameters, velocity, energy and 56Ni mass are lower than
average, a correlation not always observed in SNe IIP. SN 2005ay
may belong to the same class if the shorter distance possibility
is adopted.
Furthermore, the estimated mass range for SN 2005cs is in agreement
with limits established by using pre-supernova imaging.
Key words: supernovae: general / supernovae: individual: SN 2005ay / supernovae: individual: SN2005cs
© ESO, 2006
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