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arXiv 2103.05216astro-ph.SRastro-ph.HE
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潮汐对V723 Mon径向速度的影响:暗伴星$3\,M_\odot$的补充证据

Tidal Effects on the Radial Velocities of V723 Mon: Additional Evidence for a Dark $3\,M_\odot$ Companion

Kento Masuda, Teruyuki Hirano

摘要:

Jayasinghe等人(2021)在红巨星V723 Monoceros周围的一个几乎边缘上的$\approx 60\,\mathrm{day}$轨道上发现了一个黑暗的$\approx 3\,M_\odot$伴星,作为质量间隙中的黑洞候选者。这种情况被证明可以解释Jayasinghe等人(2021)提出的大部分数据,除了来自圆形开普勒模型的周期性径向速度(RV)残差。在这里,我们表明,RV残差的解释轨道相位相关的扭曲的吸收线的轮廓与变化的可见分数的接近和后退双方的红巨星,其表面是潮汐变形和旋转同步与黑暗的同伴。我们的RV模型采用红巨星$24.0\pm0.9\,R_\odot$的半径来约束伴星质量$M_\bullet = 2.95\pm0.17\,M_\odot$和轨道倾角$i=82.9^{+7.0}_{-3.3}\,\mathrm{deg}$(边缘后区的中值和68.3%的最高密度区间),这是由它的SED和距离来约束的。该分析为来自椭球变化的伴星质量提供了独立的支持,并为Jayasinghe等人(2021)推导的没有日食的伴星光度限制提供了支持。我们还表明,一个共同的计划来评估潮汐RV信号的通量加权平均的表面速度场可以显着低估其振幅的RV测量的互相关技术,并提出了一个修改后的处方,直接建模的扭曲的线轮廓和它的影响测量的RV。该公式对估计其它类似双星的质量和倾角也是有用的。

英文摘要:

Jayasinghe et al. (2021) identified a dark $\approx 3\,M_\odot$ companion on a nearly edge-on $\approx 60\,\mathrm{day}$ orbit around the red giant star V723 Monoceros as a black hole candidate in the mass gap. This scenario was shown to explain most of the data presented by Jayasinghe et al. (2021), except for periodic radial velocity (RV) residuals from the circular Keplerian model. Here we show that the RV residuals are explained by orbital phase-dependent distortion of the absorption line profile associated with changing visible fractions of the approaching and receding sides of the red giant star, whose surface is tidally deformed by and rotating synchronously with the dark companion. Our RV model constrains the companion mass $M_\bullet = 2.95\pm0.17\,M_\odot$ and orbital inclination $i=82.9^{+7.0}_{-3.3}\,\mathrm{deg}$ (medians and 68.3% highest density intervals of the marginal posteriors) adopting the radius of the red giant $24.0\pm0.9\,R_\odot$ as constrained from its SED and distance. The analysis provides independent support for the companion mass from ellipsoidal variations and the limits on the companion's luminosity from the absence of eclipses both derived by Jayasinghe et al. (2021). We also show that a common scheme to evaluate the tidal RV signal as the flux-weighted mean of the surface velocity field can significantly underestimate its amplitude for RVs measured with a cross-correlation technique, and present a modified prescription that directly models the distorted line profile and its effects on the measured RVs. The formulation will be useful for estimating the component masses and inclinations in other similar binaries.

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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