6 papers · 1 filter
Supersoft X-ray Light Curve of RS Oph -- The White Dwarf Mass is Now Increasing
Mariko Kato, Izumi Hachisu, Gerardo Juan Manuel Luna
The recurrent nova RS Ophiuchi, one of the candidates for Type Ia supernova progenitors, underwent the sixth recorded outburst in February 2006. We report a complete light curve of…
Optical light curves of RS Oph (2006) and hydrogen burning turnoff
Izumi Hachisu, Mariko Kato, Seiichiro Kiyota +11
We report a coordinated multi-band photometry of the RS Oph 2006 outburst and highlight the emission line free y-band photometry that shows a mid-plateau phase at y ~ 10.2 mag from…
Recurrent Novae, Classical Novae, Symbiotic Novae, and Population II Novae
Mariko Kato
Light curve analysis of decay phase of nova outburst are summarized. Nova duration is determined by the strong wind mass-loss which depends only on the white dwarf mass. Fast novae…
V2487 Ophiuchi: A strong candidate for a recurrent nova and a progenitor of Type Ia supernova
Izumi Hachisu, Mariko Kato, Taichi Kato +1
The light curve of the 1998 outburst of V2487 Ophiuchi (Nova Oph 1998) shows a very rapid decline (t_3 ~ 9 day) and a mid-plateau phase from 10 to 30 days after the optical maximum…
Revised analysis of the supersoft X-ray phase, helium enrichment, and turn-off time in the 2000 outburst of the recurrent nova CI Aquilae
Izumi Hachisu, Mariko Kato
The recurrent nova CI Aquilae entered the final decline phase a bit before May of 2001, showing the slowest evolution among the recurrent novae. Based on the optically thick wind m…
Type Ia Supernova Progenitors, Environmental Effects, and Cosmic Supernova Rates
Ken'ichi Nomoto, Hideyuki Umeda, Izumi Hachisu +3
Relatively uniform light curves and spectral evolution of Type Ia supernovae (SNe Ia) have led to the use of SNe Ia as a ``standard candle'' to determine cosmological parameters, s…