TY - JOUR
T1 - SN 1999ga
T2 - A low-luminosity linear type II supernova?
AU - Pastorello, A.
AU - Crockett, R. M.
AU - Martin, R.
AU - Smartt, S. J.
AU - Altavilla, G.
AU - Benetti, S.
AU - Botticella, M. T.
AU - Cappellaro, E.
AU - Mattila, S.
AU - Maund, J. R.
AU - Ryder, S. D.
AU - Salvo, M.
AU - Taubenberger, S.
AU - Turatto, M.
PY - 2009/6
Y1 - 2009/6
N2 - Context. Type II-linear supernovae are thought to arise from progenitors that have lost most of their H envelope by the time of the explosion, and they are poorly understood because they are only occasionally discovered. It is possible that they are intrinsically rare, but selection effects due to their rapid luminosity evolution may also play an important role in limiting the number of detections. In this context, the discovery of a subluminous type II-linear event is even more interesting.Aims. We investigate the physical properties and characterise the explosion site of the type II SN 1999ga, which exploded in the nearby spiral galaxy NGC 2442.Methods. Spectroscopic and photometric observations of SN 1999ga allow us to constrain the energetics of the explosion and to estimate the mass of the ejected material, shedding light on the nature of the progenitor star in the final stages of its life. The study of the environment in the vicinity of the explosion site provides information on a possible relation between these unusual supernovae and the properties of the galaxies hosting them.Results. Despite the lack of early-time observations, we provide reasonable evidence that SN 1999ga was probably a type II-linear supernova that ejected a few solar masses of material, with a very small amount of radioactive elements of the order of 0.01⊙.
AB - Context. Type II-linear supernovae are thought to arise from progenitors that have lost most of their H envelope by the time of the explosion, and they are poorly understood because they are only occasionally discovered. It is possible that they are intrinsically rare, but selection effects due to their rapid luminosity evolution may also play an important role in limiting the number of detections. In this context, the discovery of a subluminous type II-linear event is even more interesting.Aims. We investigate the physical properties and characterise the explosion site of the type II SN 1999ga, which exploded in the nearby spiral galaxy NGC 2442.Methods. Spectroscopic and photometric observations of SN 1999ga allow us to constrain the energetics of the explosion and to estimate the mass of the ejected material, shedding light on the nature of the progenitor star in the final stages of its life. The study of the environment in the vicinity of the explosion site provides information on a possible relation between these unusual supernovae and the properties of the galaxies hosting them.Results. Despite the lack of early-time observations, we provide reasonable evidence that SN 1999ga was probably a type II-linear supernova that ejected a few solar masses of material, with a very small amount of radioactive elements of the order of 0.01⊙.
KW - Stars: supernovae: general
KW - Stars: supernovae: individual: SN 1979C
KW - Stars: supernovae: individual: SN 1980K
KW - Stars: supernovae: individual: SN 1999ga
KW - stars: supernovae: individual: SN 1990K
UR - http://www.scopus.com/inward/record.url?scp=67650591062&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/200911993
DO - 10.1051/0004-6361/200911993
M3 - Article
SN - 0004-6361
VL - 500
SP - 1013
EP - 1023
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 3
ER -