An Eccentric Binary Millisecond Pulsar in the Galactic Plane
An Eccentric Binary Millisecond Pulsar in the Galactic Plane
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DOI：
10.1126/science.1157580
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发表时间：
2008-05
期刊：
影响因子：
56.9
通讯作者：
D. Champion;S. Ransom;P. Lazarus;F. Camilo;C. Bassa;V. Kaspi;D. Nice;P. Freire;I. Stairs
中科院分区：
文献类型：
--
作者：
D. Champion;S. Ransom;P. Lazarus;F. Camilo;C. Bassa;V. Kaspi;D. Nice;P. Freire;I. Stairs
双星脉冲星系统是研究恒星和双星演化以及极端环境物理学的绝佳探测器。在阿雷西博望远镜的勘测中，我们发现了PSR J1903+0327，这是一颗射电脉冲星，自转周期为2.15毫秒，绕太阳质量运行95天的轨道高度偏心(e=0.44)(\Batchmode\Documentclass[fleqn，10pt，LegalPaper]{文章}\usepackage{amssymb}\usepackage{amsfonts}\usepackage{amsath}\pagestyle{Empty}\Begin{Document}\(\mathm{M}_{{\ODOT}}\)\end{Document})。红外观测发现了一颗可能的主序伴星。传统的双星演化模型既不能预测大的轨道偏心率，也不能预测毫秒脉冲星周围的主序列伴星。另一种形成方案包括回收球状星团中的一颗中子星，然后将其弹出到银河系盘中，或者成为等级三元系的成员。对脉冲星计时观测的相对论分析发现，其质量为1.74±0.04\BatchMODE\Documentclass[fleqn，10pt，LegalPaper]{文章}\usepackage{amssymb}\usepackage{amsfonts}\usepackage{amsath}\Page Style{Empty}\Begin{Document}\(\mathm{M}_{{\ODOT}}\)\end{Document}，这是一个异常高的值。
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+0327, a radio pulsar with a rotational period of 2.15 milliseconds in a highly eccentric (e = 0.44) 95-day orbit around a solar mass (\batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{M}_{{\odot}}\) \end{document}) companion. Infrared observations identify a possible main-sequence companion star. Conventional binary stellar evolution models predict neither large orbital eccentricities nor main-sequence companions around millisecond pulsars. Alternative formation scenarios involve recycling a neutron star in a globular cluster, then ejecting it into the Galactic disk, or membership in a hierarchical triple system. A relativistic analysis of timing observations of the pulsar finds its mass to be 1.74 ± 0.04 \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{M}_{{\odot}}\) \end{document}, an unusually high value.