Late-time photometry of two nearby type II-P supernovae: 2004dj and 2004et

作     者：Tian-Meng Zhang Xiao-Feng Wang Xu Zhou Jun Ma Zhao-Ji Jiang Jiang-Hua Wu Zhen-Yu Wu Stephane Basa 

作者机构：NationalAstronomicalObservatories Chinese Academy of Sciences Beijing 100012 China Observatoire Astronomique de Marseille-Provence 38 rue Fric Joliot-Curie 13388 Marseille Cedex 13 France Physics Department and Tsinghua Center for Astrophysics （THCA） Tsinghua University Beijing 100084 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Department of Astronomy University of California Berkeley CA 94720-3411 USA 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2009年第9卷第7期

页      面：783-790页

核心收录：

学科分类：0709[理学-地质学] 070207[理学-光学] 07[理学] 08[工学] 0708[理学-地球物理学] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the Chinese National Natural Science Foundation through grants 10873016, 10803007, 10473012, 10573020, 10633020, 10603006 and 10673007 the National Basic Research Program of China (973 Program) No. 2007CB815403 the National Key Basic Research Science Foundation (NKBRSF TG199075402) Basic Research Funding at Tsinghua University (JCqn2005036) 

主　　题：supernovae general - supernovae: individual (SN 2004dj SN 2004et) -techniques: photometric 

摘      要：We present late-time photometry for two bright type II-P supernovae （SNe） 2004dj and 2004et, extending over 400 d after the explosion, which are measured with a set of intermediate-band filters that have the advantage of tracing the strength variations of some spectral features. Although these two SNe II-P exhibit similar photometric evolution at earlier times, they diverge during the nebular phase. SN 2004dj shows a slow late-time decline rate with - 0.7 ±0.1 mag （100d）^-1 during the period ranging from t ≈ 200 - 300 d after the explosion, while SN 2004et shows a much faster decline rate at a comparable phase, e.g., 1.3 ± 0.1 mag （100d）^-1. The steeper decay rate seen in SN 2004et is likely due to dust formation in the explosion ejecta. Based on intermediate-band photometry, we derived the evolution of the feature lines [e.g., Hα] of SNe 2004dj and 2004et which are similar in flux at comparable phases but perhaps with significantly different decay rates. The origin of the observed variations in the continuum and the feature lines is briefly discussed.