论文标题
IIB型超新星SN 2016GKG的无线电演变
Radio evolution of a Type IIb supernova SN 2016gkg
论文作者
论文摘要
我们在$ t \ sim $ 8 $ - $ 8 $ - $ 1429天爆炸后的$ν\ sim $ 0.33 $ 0.33 $ 25 ghz时，我们向IIB Supernova类型（SN IIB）进行广泛的无线电监控。详细的无线电曲线和光谱与自dsnchrotrotron发射的详细无线电曲线和光谱由于SN休克与偶然介质的相互作用而与自吸收的同步子发射一致。该模型低估了探索后$ t \ sim $ 299天的通量密度为2倍，这可能表明由于祖细胞的不均匀质量损失，CSM的密度增强。假设有风速$ v _ {\ rm w} \ sim $ 200 km s $ s $^{ - 1} $，我们估计质量 - 降低的速率为$ \ dot {m} \ sim $（2.2，3.6，3.6，3.8，3.8，12.6，3.7，和5.0）在爆炸前，$ \ sim $ 8、15、25、48、87和115年期间的yr $^{ - 1} $。 SN 2016gg的冲击波从$ r \ sim $ 0.5 $ \ times $ 10 $^{16} $到7 $ \ times $ \ times $ 10 $^{16} $ cm在$ t \ sim $ 24 $ 24 $ - $ 24 $ - $ 492天后，表示震动折射索引，$ M $ $ $ $ $ $ \ $ \ prop $ r \ r \ r r \ r r v v v v v v v v v v v v v v v v v v v v v v v v v v v v v v v v v v v。 \ sim $ 0.1C。无线电数据与自由无吸收模型和更高的冲击速度不一致，支持SN 2016GKG的相对紧凑的祖细胞。
We present extensive radio monitoring of a type IIb supernova (SN IIb), SN 2016gkg during $t \sim$ 8$-$1429 days post explosion at frequencies $ν\sim$ 0.33$-$25 GHz. The detailed radio light curves and spectra are broadly consistent with self-absorbed synchrotron emission due to the interaction of the SN shock with the circumstellar medium. The model underpredicts the flux densities at $t \sim$ 299 days post-explosion by a factor of 2, possibly indicating a density enhancement in the CSM due to a non-uniform mass-loss from the progenitor. Assuming a wind velocity $v_{\rm w} \sim$ 200 km s$^{-1}$, we estimate the mass-loss rate to be $\dot{M} \sim$ (2.2, 3.6, 3.8, 12.6, 3.7, and 5.0) $\times$ 10$^{-6}$ $M_{\odot}$ yr$^{-1}$ during $\sim$ 8, 15, 25, 48, 87, and 115 years, respectively before the explosion. The shock wave from SN 2016gkg is expanding from $R \sim$ 0.5 $\times$ 10$^{16}$ to 7 $\times$ 10$^{16}$ cm during $t \sim$ 24$-$492 days post-explosion indicating a shock deceleration index, $m$ $\sim$ 0.8 ($R \propto t^m$), and mean shock velocity $v \sim$ 0.1c. The radio data being inconsistent with free-free absorption model and higher shock velocities are in support of a relatively compact progenitor for SN 2016gkg.
