论文标题
银河SNR G272.2-3.2中SN IA的可能幸存的伴侣
A possible surviving companion of the SN Ia in the Galactic SNR G272.2-3.2
论文作者
论文摘要
我们使用{\ it gaia} edr3探索大约7,500年前IA Supernova（SNIA）爆炸产生的银河系超新星SNR G272.2-3.2，以寻找幸存的伴侣。从SNR弹出的丰度中，G272.2-3.2是正常的SN IA。 {\ it gaia}视差允许选择位于SNR估计距离范围内的恒星，以及{\ it Gaia}的适当运动以研究其运动学。从{\ it gaia} edr3光度法中，我们构造了所选样品的HR图，我们将其与SNIA可能的星星伴侣演变的理论预测进行了比较。我们可以通过组合运动学和光度法来丢弃几种建议的伴侣。我们还可以丢弃高速级别的星星。我们将研究重点放在运动学上最奇特的恒星上，{\ it gaia} edr3 5323900215411075328（以下简称MV-G272），8.9 $σ$σ$σ$ forlllllllllllllllllllllallllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll，potellllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll例一下。它是M1-M2恒星类型的。它在天空上的轨迹将其定位在6,000--8，000年前的SNR中心，在样本中是一个独特的特征。光谱允许确定出色的参数和化学丰度分析。总之，我们有一个候选人成为导致SNR G272.2-3.2的SN IA的幸存者。它的运动特征及其在SNR中的轨迹得到了支持。这打开了与M型矮人伴侣的SN IA单一场景的可能性。
We use the {\it Gaia} EDR3 to explore the Galactic supernova remnant SNR G272.2-3.2, produced by the explosion of a Type Ia supernova (SNIa), about 7,500 years ago, to search for a surviving companion. From the abundances in the SNR ejecta, G272.2-3.2 is a normal SN Ia. The {\it Gaia} parallaxes allow to select the stars located within the estimated distance range of the SNR, and the {\it Gaia} proper motions to study their kinematics. From the {\it Gaia} EDR3 photometry, we construct the HR diagram of the selected sample, which we compare with the theoretical predictions for the evolution of possible star companions of SNIa. We can discard several proposed types of companions by combining kinematics and photometry. We can also discard hypervelocity stars. We focus our study on the kinematically most peculiar star, {\it Gaia} EDR3 5323900215411075328 (hereafter MV-G272), a 8.9 $σ$ outlier in proper motion. It is of M1-M2 stellar type. Its trajectory on the sky locates it at the center of the SNR, 6,000--8,000 years ago, a unique characteristic among the the sample. Spectra allow a stellar parameters determination and a chemical abundance analysis. In conclusion, we have a candidate to be the surviving companion of the SN Ia that resulted in SNR G272.2-3.2. It is supported by its kinematical characteristics and its trajectory within the SNR. This opens the possibility of a single-degenerate scenario for a SN Ia with an M-type dwarf companion.
