LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova-猫眼课题宝

DOI：

10.1093/mnras/stx1709

发表时间：

2017-07

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

C. Barbarino;M. Botticella;M. Dall’ora;M. Valle;S. Benetti;J. Lyman;S. Smartt;I. Arcavi;C. Baltay;D. Bersier;M. Dennefeld;N. Ellman;M. Fraser;A. Gal-Yam;G. Hosseinzadeh;D. Howell;C. Inserra;E. Kankare;G. Leloudas;K. Maguire;C. McCully;A. Mitra;R. McKinnon;E. F.Olivares;G. Pignata;D. Rabinowitz;S. Rostami;K. Smith;M. Sullivan;S. Valenti;O. Yaron;D. Young

我们提出的光度和光谱演化的Ic型超新星LSQ 14 efd，发现的La Silla QUEST调查，其次是PESSTO。LSQ 14 efd在爆炸后几天被发现，观测时间长达100天。早期的光度点显示了超新星爆炸时，祖先经历的冲击爆发事件冷却的特征，这是第一个Ic型超新星爆炸。与Ic型超新星光谱的比较显示，LSQ 14 efd与Ic型SN 2004 aw非常相似。这两颗超新星的动能介于标准Ic爆炸和已知能量最高的爆炸（如SN 1998 bw）之间。我们计算了光变曲线峰值的分析模型，并估计出喷出物的质量为6.3 +/- 0.5 Msun，合成镍的质量为0.25 Msun，动能为Ekin = 5.6 +/- 0.5 x 10^51 erg。LSQ 14 efd和GRB事件之间没有联系。然而，我们指出这颗超新星与奇特的SN-Ia 1999 ac和SN-Iax SN 2008 A在光谱上有一些相似之处。一个核心崩溃的起源是最有可能考虑到光谱，光度的演变和检测的冷却冲击爆发。

We present the photometric and spectroscopic evolution of the type Ic supernova LSQ14efd, discovered by the La Silla QUEST survey and followed by PESSTO. LSQ14efd was discovered few days after explosion and the observations cover up to ~100 days. The early photometric points show the signature of the cooling of the shock break-out event experienced by the progenitor at the time of the supernova explosion, one of the first for a type Ic supernova. A comparison with type Ic supernova spectra shows that LSQ14efd is quite similar to the type Ic SN 2004aw. These two supernovae have kinetic energies that are intermediate between standard Ic explosions and those which are the most energetic explosions known (e.g. SN 1998bw). We computed an analytical model for the light-curve peak and estimated the mass of the ejecta 6.3 +/- 0.5 Msun, a synthesized nickel mass of 0.25 Msun and a kinetic energy of Ekin = 5.6 +/- 0.5 x 10^51 erg. No connection between LSQ14efd and a GRB event could be established. However we point out that the supernova shows some spectroscopic similarities with the peculiar SN-Ia 1999ac and the SN-Iax SN 2008A. A core-collapse origin is most probable considering the spectroscopic, photometric evolution and the detection of the cooling of the shock break-out.

LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova

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