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arXiv 2007.10005astro-ph.HE
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红背脉冲星J1227 $-$ 4853的食研究

Study of eclipses for Redback pulsar J1227$-$4853

Sanjay Kudale, Jayanta Roy, Bhaswati Bhattacharyya, Ben Stappers, Jayaram Chengalur

摘要:

本文对2014年利用GMRT发现的一颗红背毫秒脉冲星J1227 $-$ 4853的食特性进行了多频研究。这颗脉冲星的辐射在607 MHz处被遮蔽,约有37%的轨道围绕着上合点。我们观察到日食的入口和出口过渡,分别持续12%和15%的轨道,导致只有36%的轨道不受日食物质的影响。我们在日食边界处观测到了0.079(3)pc cm $^{-3}$的过量色散测量(DM),相应的电子柱密度(N $_e$)为24.4(8)x 10 $^{16}$ cm $^{-2}$。同步的计时和成像研究表明,J1227 $-$ 4853中的日食并不是由过度色散和散射造成的时间模糊造成的,而是由于脉冲信号的回旋吸收导致的脉冲星通量被限制伴星磁场的双星内材料所去除。此外,在轨道相位0.71和0.82的下合附近,脉冲发射显着延迟,这与脉冲和连续通量密度的衰减有关。在轨道相位$\sim$为0.82时,我们测量到DM为0.035(3)pc cm $^{-3}$,N $_e$为10.8(8)x 10 $^{16}$ cm $^{-2}$,与最高达峰值通量密度的$\sim$ 30%的调光相关。在其他食双星中,没有关于固定轨道相位的通量衰减的报道。此外,该事件可能是由通过L2拉格朗日点的质量损失产生的等离子体碎片斑点吸收脉冲信号引起的。

英文摘要:

We present a multi-frequency study of eclipse properties of a transitional redback millisecond pulsar J1227$-$4853 discovered in 2014 with the GMRT. Emission from this pulsar is eclipsed at 607 MHz for about 37% of its orbit around the superior conjunction. We observe eclipse ingress and egress transition which last 12% and 15% of its orbit respectively, resulting in only 36% of the orbit being unaffected by eclipsing material. We report an excess dispersion measure (DM) at eclipse boundaries of 0.079(3) pc cm$^{-3}$ and the corresponding electron column density (N$_e$) is 24.4(8) x 10$^{16}$ cm$^{-2}$. Simultaneous timing and imaging studies suggests that the eclipses in J1227$-$4853 are not caused by temporal smearing due to excess dispersion and scattering but could be caused by removal of pulsar flux due to cyclotron absorption of the pulsed signal by intra-binary material constraining the companion's magnetic field. Additionally, near inferior conjunction at orbital phase 0.71 and 0.82 the pulsed emission is significantly delayed which is associated with a fading of the pulsed and continuum flux densities. At orbital phase $\sim$0.82, we measure a change in DM of 0.035(3) pc cm$^{-3}$ and N$_e$ of 10.8(8) x 10$^{16}$ cm$^{-2}$ associated with a dimming of up to $\sim$30% of the peak flux density. Such flux fading around a fixed orbital phase is not reported for other eclipsing binaries. Moreover, this event around inferior conjunction could be caused by absorption of pulsed signal by fragmented blobs of plasma generated from mass loss through the L2 Lagrangian point.

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