论文标题
IB/C型SN 2013GE的候选祖细胞伴侣明星
The Candidate Progenitor Companion Star of the Type Ib/c SN 2013ge
论文作者
论文摘要
这封信介绍了在预计放射性组件逐渐消失的四年以上,在IB/C型超新星(SN)2013GE的位置上发现了一个源。该来源可能标志着SN后首次直接检测幸存的伴侣,以剥离的IB/C型爆炸。我们检验了这一假设,并发现源光谱能量分布的形状与B5 I Supergian的形状最一致。虽然二进制模型倾向于预测剥离的eNVELOPE伴侣的ob型恒星,但源在颜色标记图(CMD)上的位置使其在主序列(MS)上更有可能位置。该来源可以暂时来自热平衡,也可以是凉爽且充气的非MS伴侣,该伴侣类似于建议的IB SN型型伴侣2019yvr,该伴侣受到前SN成像的约束。我们还考虑了来源的其他可能的物理场景,包括褪色的SN,Centellar Shock相互作用,现场重合线以及未解决的宿主星群,所有这些都需要将来的观察以更明确地排除。最终,幸存的伴侣的比例(“二进制部分”)将对二元进化模型和潜在物理学提供必要的限制。
This Letter presents the detection of a source at the position of the Type Ib/c supernova (SN) 2013ge more than four years after the radioactive component is expected to have faded. This source could mark the first post-SN direct detection of a surviving companion to a stripped-envelope Type Ib/c explosion. We test this hypothesis and find the shape of the source's spectral energy distribution is most consistent with that of a B5 I supergiant. While binary models tend to predict OB-type stars for stripped-envelope companions, the location of the source on a color-magnitude diagram (CMD) places it redward of its more likely position on the main sequence (MS). The source may be temporarily out of thermal equilibrium, or a cool and inflated non-MS companion, which is similar to the suggested companion of Type Ib SN 2019yvr that was constrained from pre-SN imaging. We also consider other possible physical scenarios for the source, including a fading SN, circumstellar shock interaction, line of site coincidence, and an unresolved host star cluster, all of which will require future observations to more definitively rule out. Ultimately, the fraction of surviving companions ("binary fraction") will provide necessary constraints on binary evolution models and the underlying physics.