2011年再发新星T Pyx喷发的线性分光偏振观测
Linear Spectropolarimetry of the 2011 Eruption of the Recurrent Nova T Pyx
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中文总结 AI 辅助
通过分析再发新星T Pyx 2011年喷发的九个历元VLT/FORS2分光偏振数据，发现连续谱偏振通常低于1%且取向约95度，吸收线偏振可达2%，并识别出两个速度相关的偏振分量，从而约束了喷出物的几何与运动学结构。
中文摘要 AI 辅助
我们研究了再发新星T Pyxidis 2011年喷发的内禀偏振的时间演化，并利用其连续谱和谱线偏振特征来约束喷出物的几何与运动学结构。我们分析了在发现后24至70天之间获得的九个历元的VLT/FORS2光学线性分光偏振数据，时间跨度从光学极大之前不久到早期下降阶段。仪器和星际偏振贡献被扣除，其中星际偏振通过巴耳末发射分量静止波长处观测到的退偏振来估算。我们检查了Hβ、Hγ和Hδ P Cygni轮廓上的连续谱和速度相关的内禀偏振。内禀连续谱偏振通常保持在1%以下，并主要排列在约95度的位置角上，但在光学极大附近除外，此时约185度的正交分量暂时占主导。蓝移的巴耳末吸收线显示出更强的偏振，经常达到2%，并与Q-U平面中的偏移和环状结构相关联。至少检测到两个不同的速度相关偏振分量：较高速度的吸收优先与95度取向相关，而较低速度的吸收通常追踪185度取向。在所有三条巴耳末线中，偏振峰随时间准线性地向更高的蓝移速度移动。
英文摘要
ABRIDGED We investigate the temporal evolution of the intrinsic polarization of the 2011 eruption of the recurrent nova T Pyxidis and use its continuum and line-polarization signatures to constrain the geometry and kinematic structure of the ejecta. We analyzed nine epochs of VLT/FORS2 optical linear spectropolarimetry obtained between 24 and 70 days after discovery, from shortly before optical maximum to the early decline. The instrumental and interstellar polarization contributions were removed, with the latter estimated from the depolarization observed at the rest wavelengths of the Balmer emission components. We examined the continuum and the velocity-dependent intrinsic polarization across the Hbeta, Hgamma, and Hdelta P Cygni profiles. The intrinsic continuum polarization generally remains below 1% and is predominantly aligned at a position angle of approximately 95degrees, except near optical maximum, when an orthogonal component at approximately 185degrees temporarily dominates. The blueshifted Balmer absorptions display stronger polarization, frequently reaching 2%, associated with excursions and loops in the Q-U plane. At least two distinct velocity-dependent polarization components are detected: the higher-velocity absorption is preferentially associated with the 95degrees orientation, whereas the lower-velocity absorption generally traces the 185degrees orientation. The polarization peaks shift quasi-linearly towards higher blueshifted velocities with time in all three Balmer lines.
发表机构
- Universidad Internacional de Valencia (VIU)（瓦伦西亚国际大学）
- Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Unidad Asociada al CSIC（阿拉贡宇宙物理研究中心（CEFCA），CSIC联合单位）
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