论文标题
热核超新星2021RHU的光谱极化：峰值发光后79天高钙极化
Spectropolarimetry of the Thermonuclear Supernova 2021rhu: High Calcium Polarization 79 Days After Peak Luminosity
论文作者
论文摘要
我们报告了四个时期的IA Supernova型（SN）2021RHU的光谱观测：$ - 7，+0，+0，+36和+79天，相对于其$ b $ band-band的最大发光度。波长依赖的连续性极化峰值为$ 3890 \ pm 93 $ hexstroms，达到$ p _ {\ rm max} = 1.78％\ pm 0.02 $％。极化曲线的峰值比银河系典型的峰值更蓝，这表明沿着视线到SN的视线范围更大。在删除了星际两极分化后，我们发现CAII近红外三胞胎的两极分化明显增加，从$ \ sim $ 0.3％$ -7- $ 7- $ 7到$ \ $ \ sim $ \ sim $ 2.5％+79 +79。从+39到+74天，没有看到高分辨率通量光谱的时间演化，并且表明极性的延迟时间增加与SN固有，而不是由散射SN光子在conternar或Interstellar Matter中散射。我们建议对CAII近红外三重化极化的后期上升的解释可能是弱磁场中钙原子在弱磁场中的比对，这是通过对SN的各向异性辐射的光激发/泵送的。
We report spectropolarimetric observations of the Type Ia supernova (SN) 2021rhu at four epochs: $-$7, +0, +36, and +79 days relative to its $B$-band maximum luminosity. A wavelength-dependent continuum polarization peaking at $3890 \pm 93$ Angstroms and reaching a level of $p_{\rm max}=1.78% \pm 0.02$% was found. The peak of the polarization curve is bluer than is typical in the Milky Way, indicating a larger proportion of small dust grains along the sightline to the SN. After removing the interstellar polarization, we found a pronounced increase of the polarization in the CaII near-infrared triplet, from $\sim$0.3% at day $-$7 to $\sim$2.5% at day +79. No temporal evolution in high-resolution flux spectra across the NaID and CaIIH&K features was seen from days +39 to +74, indicating that the late-time increase in polarization is intrinsic to the SN as opposed to being caused by scattering of SN photons in circumstellar or interstellar matter. We suggest that an explanation for the late-time rise of the CaII near-infrared triplet polarization may be the alignment of calcium atoms in a weak magnetic field through optical excitation/pumping by anisotropic radiation from the SN.
