AI 中文总结
本研究通过MUSE观测SNR 0509-67.5，利用神经网络、贝叶斯推断等方法确定其为双简并并合的Ia型超新星前身星，测得相关动力学参数，完善了该前身星系统的动力学图像。
AI 中文摘要
对SNR 0509-67.5的深度MUSE观测显示，日冕[Fe XIV] λ5303发射线在整个遗迹中呈现出单或双速度分量，源于向观测者运动和远离观测者的反向激波抛射物。一个监督式密集神经网络对每个空间像素进行分类，并对观测到的线发射拟合高斯轮廓和线性函数。我们测得整体多普勒速度为-1000±60 km/s，解释为双简并并合中主白矮星轨道速度的视线分量。红移和蓝移抛射物图在东北边缘呈现扁平边缘，与伴星的阴影一致，表明爆炸时存在双星伴星。将该特征建模为锚定在爆炸中心的锥状结构并应用贝叶斯推断，我们恢复了锥的取向和半张角。随后我们使用Eggleton洛希瓣关系推断伴星性质：伴星可能是质量约0.6 M☉、半径约9800 km的白矮星，爆炸时轨道速度约1700 km/s。这些结果共同为Ia型超新星前身星系统提供了完整的动力学图像，其极大光光谱可通过光回波观测独立约束。
英文摘要
Deep MUSE observations of SNR 0509-67.5 reveal that the coronal [Fe\,\textsc{xiv}] $\mathrmλ$5303 emission line appears with either one or two velocity components across the entire remnant, arising from reverse-shocked ejecta moving toward and away from the observer. A supervised dense neural network classifies each spaxel and fits Gaussian profiles plus a linear function to the observed line emission. We measure a bulk Doppler velocity of $-1000\pm60~~\mathrm{km~s^{-1}}$, interpreted as the line-of-sight component of the primary white dwarf's orbital velocity in a double-degenerate merger. The red- and blue-shifted ejecta map shows a flattened edge along the north-eastern rim, consistent with the companion's shadow, indicating a binary companion was present at explosion. Modelling this feature as a cone anchored at the explosion centre and applying Bayesian inference, we recover the cone's orientation and half-opening angle. We then use the Eggleton Roche-lobe relation to infer properties of the companion. The companion was likely a ${\sim}0.6~\mathrm{M_\odot}$ white dwarf with radius ${\sim}9800$~km and orbital velocity ${\sim}1700~\mathrm{km~s^{-1}}$ at the time of explosion. Together, these results provide a complete dynamical picture of a Type Ia supernova progenitor system whose maximum-light spectrum is independently constrained by light echo observations.
Comments14 pages, 10 figures, supplementary materials
Journal refDas et al., Monthly Notices of the Royal Astronomical Society, Volume 550, Issue 4, August 2026, stag1329
