通过旋转弥散权衡致密天体候选者的隐藏伴星
Weighing Hidden Companions of Compact Object Candidates via Rotational Broadening
AI总结：
通过测量旋转弥散确定致密天体候选者的隐藏伴星质量，发现其中两个目标可能为Ia型超新星前身。
摘要：
确定未见伴星质量（M₁）对于识别双星系统中的致密天体至关重要，但获得可靠的轨道倾角仍然是最困难的挑战之一。本研究聚焦于从89个具有大质量函数、快速自转和高质量大天区多目标光纤光谱望远镜（LAMOST）光谱的候选致密天体样本中选出的10个目标。我们从LAMOST中等分辨率光谱中测量其投影自转速度（v sin i），并结合恒星半径推导出轨道倾角和相应的伴星质量。我们的结果表明，五个源显示质量比M₁/M₂>2/3，没有检测到未见伴星的光谱特征，提供了其致密性质的有力证据。两个特别值得注意的案例，J0341和J0359，分别拥有推断质量为1.39±0.09 M☉和1.34±0.08 M☉的伴星。这些质量表明，这些不可见物体可能是中子星或接近钱德拉塞卡极限的高質量白矮星。如果它们是白矮星，这两个目标极有可能是Ia型超新星的前身。本研究突显了v sin i测量作为系统揭示双星中致密天体潜力的前景。
英文摘要：
The determination of unseen companion masses ($M_1$) is essential for identifying compact objects in binary systems, yet obtaining reliable orbital inclinations remains one of the most difficult challenges. In this study, we focus on ten targets selected from a sample of 89 compact object candidates characterized by large mass functions, rapid rotation, and high-quality Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) spectra. We measure their projected rotational velocities ($v \sin i$) from the LAMOST medium-resolution spectra and, combined with stellar radii, derive orbital inclinations and the corresponding companion masses. Our results show that five sources exhibit mass ratios $M_1 / M_2 > 2/3$, with no detectable spectral signatures of the unseen companions, providing strong evidence for their compact nature. Two particularly notable cases, J0341 and J0359, host companions with inferred masses of $1.39^{+0.09}_{-0.10}$ $M_\odot$ and $1.34^{+0.08}_{-0.09}$ $M_\odot$, respectively. These masses suggest that the invisible objects are either neutron stars or massive white dwarfs with masses close to the Chandrasekhar limit. If they are white dwarfs, these two targets are highly likely to be Type Ia supernova progenitors. This study highlights the potential of $v \sin i$ measurements as a systematic approach to unveiling compact objects in binaries.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
