利用快速光度计SiFAP2搜寻蜘蛛毫秒脉冲星的光脉冲
Searching for optical pulsations from spider millisecond pulsars with the fast photometer SiFAP2
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中文总结 AI 辅助
该研究用SiFAP2光度计搜寻密近双星中旋转驱动蜘蛛毫秒脉冲星的光脉冲，未检测到超过3σ置信水平的光脉冲，为相关参数设限，支持吸积盘加速光脉冲辐射粒子的观点。
中文摘要 AI 辅助
近期，人们已从一颗过渡型毫秒脉冲星（MSP）和一颗吸积毫秒脉冲星中发现了毫秒脉冲星的光脉冲，还从一颗旋转驱动的红背毫秒脉冲星中找到了光脉冲的证据。观测表明，光脉冲辐射的产生机制取决于系统中是否存在吸积盘。我们选取了一批处于密近双星中的旋转驱动毫秒脉冲星（轨道周期P_orb<1天，包含红背和黑寡妇型），使用安装在伽利略国家望远镜（TNG）上的SiFAP2光度计搜寻光学周期信号。我们采用历元折叠法进行脉冲搜寻，对每个系统使用最新的（射电或伽马射线）轨道解，这些解来自已发表的成果或南赛射电望远镜、巨米波射电望远镜、帕克斯天文台以及费米伽马射线空间望远镜（Fermi-LAT）的近期观测。我们更新或确认了所研究5个系统的射电和伽马射线星历。尽管我们的观测灵敏度常接近仪器极限，但所有搜寻中均未检测到超过3σ置信水平的光脉冲，这为系统的光脉冲星等和转换效率设定了严格的上限。我们的上限与红背脉冲星PSR J2339-0533的光脉冲光度一致。与吸积型和过渡型毫秒脉冲星相比，红背和黑寡妇系统将自转下降功率转换为光脉冲辐射的效率低得多，支持了近期提出的观点：中子星周围的吸积盘在加速产生明亮光脉冲辐射的粒子过程中发挥作用。
英文摘要
Optical pulsations from millisecond pulsars (MSPs) have recently been detected in a transitional MSP and an accreting MSP. Evidence for optical pulsations has also been found for a rotation-powered redback MSP. Observations suggest that optical pulsed emission is produced by different mechanisms depending on whether an accretion disk is present in the system. We explored a sample of rotation-powered MSPs in close binaries (P$_{orb}<1\,$day; redbacks and black widows), searching for optical periodic signals with the $SiFAP2$ photometer mounted on the $Telescopio\,Nazionale\, Galileo$ (TNG). We performed pulsation searches using the epoch-folding method with the most up-to-date (radio or gamma-ray) orbital solution for each system. These solutions were based either on previously published works or recent observations from Nançay, the Giant Metrewave Radio Telescope, the Parkes Observatory, and $Fermi$-LAT. We update or confirm radio and gamma-ray ephemerides for five of the presented systems. No optical pulsations were detected with a significance exceeding a $3σ$ confidence level in any of our searches, despite achieving sensitivities close to the instrument's limit. This places correspondingly stringent upper limits on the systems' optical pulsed magnitude and conversion efficiency. Our upper limits are consistent with the pulsed optical luminosity of optical pulsations from the redback PSR J2339-0533. Compared to accreting and transitional MSPs, redback and black widow systems show much lower efficiency in converting their spin-down power into pulsed optical emission. This supports the recent suggestion that the accretion disk around the neutron star plays a role in accelerating the particles responsible for producing bright optical pulsed emission.
发表机构
- INAF Osservatorio Astronomico di Roma（意大利国家天体物理研究所罗马天文台）
- Dipartimento di Fisica, Sapienza Università di Roma（罗马智慧大学物理系）
- Institute of Space Sciences (ICE, CSIC)（空间科学研究所（西班牙高等科学研究理事会））
- Institut d’Estudis Espacials de Catalunya (IEEC)（加泰罗尼亚太空研究学院）
- INAF - Osservatorio Astronomico di Brera（意大利国家天体物理研究所布雷拉天文台）
- ASI - Agenzia Spaziale Italiana（意大利航天局）
- Department of Physics, Norwegian University of Science and Technology（挪威科技大学物理系）
机构由 AI 辅助整理，请以论文原文为准。
