来自LAMOST DR13 MRS和Gaia DR3的长周期双星样本中的休眠致密天体候选体
A Sample of Long-Period Binaries with Dormant Compact-Object Candidates from LAMOST DR13 MRS and Gaia DR3
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中文总结 AI 辅助
结合Gaia DR3与LAMOST DR13光谱，系统搜索长周期双星中的休眠致密天体，发现两个高质量候选体，需进一步观测确认。
中文摘要 AI 辅助
识别非相互作用双星中的休眠致密天体对于约束恒星残骸的隐藏种群至关重要。我们通过结合Gaia DR3天体测量与多历元LAMOST DR13中分辨率光谱，对长周期致密天体候选体进行了系统性搜索。从具有较高RUWE值的源出发，我们要求至少五个LAMOST光谱历元且峰峰径向速度变化超过20 km/s。在径向速度提取、轨道拟合及后续筛选后，我们获得了19个长周期单线双星候选体的贝叶斯开普勒轨道解，其周期范围约为30-1500天。使用多波段光谱能量分布拟合来约束可见恒星，并评估在主序假设下不可见伴星的预期光度。两个系统被确定为我们样本中最高优先级的致密天体候选体，每个的最小伴星质量超过1个太阳质量。它们的光谱和光学到红外测光显示没有可探测的次星光贡献，而如果不可见伴星是正常主序恒星，则预期会有这样的贡献。因此，这些系统代表了我们样本中最强的致密天体候选体，尽管需要进一步观测来区分大质量白矮星或中子星与暗弱的恒星伴星或未分辨的层级系统。我们还确定了五个中等优先级和十二个较低优先级的系统，用于后续光谱、紫外成像和未来的天体测量约束。
英文摘要
Identifying dormant compact objects in non-interacting binaries is crucial for constraining the hidden population of stellar remnants. We present a systematic search for long-period compact-object candidates by combining Gaia DR3 astrometry with multi-epoch LAMOST DR13 medium-resolution spectroscopy. Starting from sources with elevated RUWE values, we required at least five LAMOST spectroscopic epochs and peak-to-peak RV variations exceeding 20 km/s. After RV extraction, orbital fitting, and subsequent screening, we obtained Bayesian Keplerian orbital solutions for 19 long-period single-lined binary candidates, with periods spanning approximately 30-1500 days. Multi-wavelength spectral energy distribution fitting was used to constrain the visible stars and evaluate the expected luminosities of unseen companions under a main-sequence assumption. Two systems are identified as the highest-priority compact-object candidates in our sample, each with a minimum companion mass exceeding 1 solar mass. Their spectra and optical-to-infrared photometry show no detectable secondary-light contribution, although such a contribution would be expected if the unseen companions were normal main-sequence stars. These systems therefore represent the strongest compact-object candidates in our sample, although further observations are required to distinguish massive white dwarfs or neutron stars from faint stellar companions or unresolved hierarchical systems. We also identify five intermediate-priority and 12 lower-priority systems for follow-up spectroscopy, ultraviolet imaging, and future astrometric constraints.
发表机构
- Xiamen University（厦门大学）
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