两颗蜘蛛脉冲星候选体的光学后随观测：一颗被辐照的红背蜘蛛与一颗可能的双巨星冒充者
Optical Follow-Up of Two Spider Pulsar Candidates: An Irradiated Redback and a Possible Double Giant Impostor
浏览论文内容
中文总结 AI 辅助
对两颗蜘蛛脉冲星候选体进行光学后随观测，发现J0846实为双红巨星而非脉冲星，J0935被确认为处于脉冲星状态的红背蜘蛛。
中文摘要 AI 辅助
致密双星毫秒脉冲星（绰号“蜘蛛”）是一类不断增长的致密天体：在银河系场中已知有超过100个此类系统，其中包括超过30个未探测到脉冲的候选体。本文报告了对两颗蜘蛛脉冲星候选体的光学后随观测结果：2FGL J0846.0+2820（J0846，一颗轨道周期为8.1天的猎手候选体）和4FGL J0935.3+0901（J0935，轨道周期为2.4小时，曾被提议为过渡型、黑寡妇或红背蜘蛛亚类中的一种）。我们还分析了它们的多波段性质（红外、X射线和γ射线波段），以评估其性质和当前状态。J0846的光学轨道光变曲线从2023年的双峰形状变为2024年的单峰形状，但我们认为它们既不符合辐照驱动也不符合椭球轨道调制的模型。其光谱能量分布显示出两个温度（$T$）和半径（$R$）相似的黑体成分，分别主导光学波段（$T_2\simeq6000$ K，$R_2\simeq1.8$ R$_\odot$）和红外波段（$T_1\simeq3400$ K，$R_1\simeq5.2$ R$_\odot$）。基于此，我们认为J0846并非真正的脉冲星候选体，并提出另一种识别：一颗分离的双红巨星。在J0935中，我们发现光变曲线在伴星上合附近出现一个流量极大值，此时颜色和推断温度升高，表明来自脉冲星的显著辐照。我们对其伴星基底温度施加了约束（$4000\\!-\\!4600$ K），这支持了为J0935提出的三种分类之一：处于脉冲星状态的红背蜘蛛。
英文摘要
Compact binary millisecond pulsars (nicknamed "spiders") are a growing class of neutron stars: more than 100 systems are known in the Galactic field, including more than 30 candidates where pulsations have not been detected. Here we report the results of an optical follow-up of two spider pulsar candidates: 2FGL J0846.0+2820 (J0846, a huntsman candidate in an 8.1 d orbit) and 4FGL J0935.3+0901 (J0935, with a 2.4 h orbital period and proposed as a spider of either the transitional, black widow or redback sub-class). We also analyzed their multi-wavelength properties (infrared, X-ray and $γ$-ray bands), in order to assess their nature and current state. The optical orbital light curves of J0846 change from double-peaked in 2023 to single-peaked in 2024, but we argue they are not consistent with either irradiation-driven or ellipsoidal orbital modulation. Its spectral energy distribution shows evidence for two blackbody-like components with similar temperatures ($T$) and radii ($R$), which dominate the optical ($T_2\simeq6000$ K, $R_2\simeq1.8$ R$_\odot$) and infrared ($T_1\simeq3400$ K, $R_1\simeq5.2$ R$_\odot$) bands. Based on this, we argue that J0846 is not a bona fide pulsar candidate and propose an alternative identification: a detached double red giant. In J0935, we find a light curve with one flux maximum around superior conjunction of the companion, where the colors and inferred temperature increase, suggesting prominent irradiation from the pulsar. We place constraints on its companion base temperature ($4000\!-\!4600$ K), which support one of the three classifications proposed for J0935: a redback spider in the pulsar state.
发表机构
- Norwegian University of Science and Technology（挪威科技大学）
- Universitat Politècnica de Catalunya（加泰罗尼亚理工大学）
机构由 AI 辅助整理，请以论文原文为准。
