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arXiv 1209.5472astro-ph.HE
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毫秒脉冲双星J1023 +0038的红外观测:2000- 2001年相互作用相的短期性质的证据

Infrared Observations of The Millisecond Pulsar Binary J1023+0038: Evidence for Short-Term Nature of Its Interacting Phase in 2000--2001

Xuebing Wang, Zhongxiang Wang, Nidia Morrell

摘要:

本文报道了我们对过渡毫秒脉冲星系统J1023+0038的多波段红外(IR)成像,这是一颗罕见的脉冲双星,在2000- 2001年发现了一个吸积盘。观测是用近红外到远红外波长的地面和空间望远镜进行的。我们在近红外JH波段和斯皮策3.6和4.5 $μ$ m中红外通道探测到了源。结合先前报道的源的光谱,发现红外辐射来自伴星,在波长范围内没有检测到过量的辐射。由于我们的近红外通量几乎等于2000年2月2 MASS全天巡天获得的通量,结果表明,该双星在当时并不包含吸积盘,而该吸积盘的存在会使近红外辐射通量增加两倍。因此,我们的观测确定了2000- 2001年所见的相互作用阶段的短期性质:吸积盘最多存在2.5年。2010年在其12和22 $μ$ m波段进行的WISE全天巡天以及我们在70和160 $μ$ m的Herschel远红外成像都没有探测到该双星。根据尘埃的假设性质,由此产生的通量上限为尘埃颗粒的质量提供了<3 × 10 ^{22}-3 × 10 ^{25} g的限制,这些尘埃颗粒可能是以前看到的吸积盘的残余物。

英文摘要:

We report our multi-band infrared (IR) imaging of the transitional millisecond pulsar system J1023+0038, a rare pulsar binary known to have an accretion disk in 2000--2001. The observations were carried out with ground-based and space telescopes from near-IR to far-IR wavelengths. We detected the source in near-IR JH bands and Spitzer 3.6 and 4.5 $μ$m mid-IR channels. Combined with the previously-reported optical spectrum of the source, the IR emission is found to arise from the companion star, with no excess emission detected in the wavelength range. Because our near-IR fluxes are nearly equal to those obtained by the 2MASS all-sky survey in 2000 Feb., the result indicates that the binary did not contain the accretion disk at the time, whose existence would have raised the near-IR fluxes to 2-times larger values. Our observations have thus established the short-term nature of the interacting phase seen in 2000--2001: the accretion disk at most existed for 2.5 yrs. The binary was not detected by the WISE all-sky survey carried out in 2010 at its 12 and 22 $μ$m bands and our Herschel far-IR imaging at 70 and 160 $μ$m. Depending on the assumed properties of the dust, the resulting flux upper limits provide a constraint of <3x10^{22}--3x10^{25} g on the mass of the dust grains that possibly exist as the remnant of the previously-seen accretion disk.

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