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arXiv 2312.01892astro-ph.HE
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PSR J0210+5845;一颗具有B6V主序星伴星的超宽双星脉冲星

PSR J0210+5845; An ultra wide binary pulsar with a B6V main-sequence star companion

E. van der Wateren, C. G. Bassa, G. H. Janssen, I. V. Yanes-Rizo, J. Casares, G. Nelemans, B. W. Stappers, C. M. Tan

AI总结:

本文通过射电计时和光学光谱观测,发现脉冲星PSR J0210+5845拥有一颗B6V主序星伴星,确定其宽轨道中等偏心率参数,并论证电子俘获超新星是其可能的形成机制。

摘要:

我们报告了PSR J0210+5845的射电计时观测结果,这些观测揭示了其自转减慢行为与典型脉冲星存在显著偏差。我们将这些偏差解释为由围绕$V=13.5$恒星2MASS J02105640$+$5845176的双星运动所导致,该恒星在天球位置和距离上与脉冲星重合。档案观测和新的光学光谱将该恒星证认为一颗B6V型恒星,其有效温度$T_\mathrm{eff}\approx 14\\,000$K,质量$M_\mathrm{c}= 3.5$至$3.8$M$_\odot$,使其成为已知围绕非再循环脉冲星运行的质量最低的主序星。我们发现计时观测将双星轨道约束为宽轨道且中等偏心率,轨道周期为$P_\mathrm{b}=47^{+40}_{-14}$年,偏心率$e=0.46^{+0.10}_{-0.07}$。我们预测下一次近星点通过将发生在2030年至2034年之间。由于伴星质量较低,我们发现具有PSR J0210+5845及其双星伴星特性的系统在超新星爆发中存活下来的概率很低。我们表明,需要低速度且方向恰好合适的本生踢速才能使双星在超新星爆发期间保持束缚,并论证电子俘获超新星是该脉冲星一种合理的形成情景。

英文摘要:

We report on radio timing observations of PSR J0210+5845 which reveal large deviations from typical pulsar spin-down behaviour. We interpret these deviations as being due to binary motion around the $V=13.5$ star 2MASS J02105640$+$5845176, which is coincident in celestial position and distance with the pulsar. Archival observations and new optical spectroscopy identify this star as a B6V star with a temperature of $T_\mathrm{eff}\approx 14\,000$K and a mass of $M_\mathrm{c}= 3.5$ to $3.8$M$_\odot$, making it the lowest mass main-sequence star known orbiting a non-recycled pulsar. We found that the timing observations constrain the binary orbit to be wide and moderately eccentric, with an orbital period of $P_\mathrm{b}=47^{+40}_{-14}$yr and eccentricity $e=0.46^{+0.10}_{-0.07}$. We predict that the next periastron passage will occur between 2030 and 2034. Due to the low companion mass, we find that the probability for a system with the properties of PSR J0210+5845 and its binary companion to survive the supernova is low. We show that a low velocity and fortuitously directed natal kick is required for the binary to remain bound during the supernova explosion, and argue that an electron-capture supernova is a plausible formation scenario for the pulsar.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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