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题名: Very long baseline interferometry astrometry of PSR B1257+12, a pulsar with a planetary system
作者: Yan, Zhen1, 2, 4; Shen, Zhi-Qiang1, 4; Yuan, Jian-Ping3, 4; Wang, Na3, 4; Rottmann, Helge5; Alef, Walter5
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2013-07-01
卷号: 433, 期号:1, 页码:162-169
关键词: pulsars: individual: PSR B1257+12
DOI: 10.1093/mnras/stt712
文章类型: Article
英文摘要: An astrometry project on PSR B1257+12, a millisecond pulsar with a planetary system, has been carried out with the Very Long Baseline Array and the European Very Long Baseline Interferometry (VLBI) Network at the central frequencies of 1465 and 1540 MHz, respectively. This project consists of nine epochs of phase-referenced observations spanning about two years. Model-independent estimates of the distance and velocity of this pulsar have been obtained using VLBI astrometry for the first time. The precise distance to PSR B1257+12 is 710(-38)(+43) pc. This is in agreement with the timing results, but is larger than the predictions from dispersion measurements using Galactic electron density distribution models. The measured proper-motion components of PSR B1257+12 in right ascension and declination are 46.44 +/- 0.08 and -84.87 +/- 0.32 mas yr(-1), respectively. The corresponding transverse velocity of PSR B1257+12 is similar to 326 km s(-1), making it the only millisecond pulsar known so far with a velocity clearly exceeding 300 km s(-1). Based on these results, the apparent X-ray efficiency of this pulsar is estimated to be in the same range as other millisecond pulsars, which is not as low as previously thought. The planets around PSR B1257+12 should be formed in a protoplanetary disc. We review possible evolutionary scenarios for the protoplanetary disc, and conclude that the protoplanetary disc of this pulsar has most probably been formed by the evaporation or disruption of its companion in a binary.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: MILLISECOND PULSARS ; PROPER MOTIONS ; PRECISION ; BINARIES ; PSR-B1257+12 ; PARALLAXES ; EMISSION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000321461200013
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15533
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100864, Peoples R China
5.Max Planck Inst Radioastron, D-53121 Bonn, Germany
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