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监测RY Tau喷流的内部区域

Monitoring inner regions in the RY Tau jet

Taichi Uyama, Michihiro Takami, Gabriele Cugno, Vincent Deo, Olivier Guyon, Jun Hashimoto, Julien Lozi, Barnaby Norris, Motohide Tamura, Sebastien Vievard, Hans… 展开作者

Taichi Uyama, Michihiro Takami, Gabriele Cugno, Vincent Deo, Olivier Guyon, Jun Hashimoto, Julien Lozi, Barnaby Norris, Motohide Tamura, Sebastien Vievard, Hans Moritz Guenther, P. Christian Schneider, Eiji Akiyama, Tracy L. Beck, Thayne Currie, Klaus Hodapp, Jungmi Kwon, Satoshi Mayama, Youichi Ohyama, Tae-Soo Pyo, John P. Wisniewski

摘要:

我们提供了2019- 2021年使用Subaru/SCExAO+VAMPIRES,Gemini/NIFS和Keck/OSIRIS获得的H $α$和[ \ion{Fe}{2} ] 1.644 \micron ~发射线的RY~Tau喷流的多历元观测。这些数据显示了一系列的四个节在1 $\arcsec$符合$\sim$ 0 \farcs 3~yr $^{-1}$的自行,类似于与其他几个活跃的金牛座T星有关的喷流。然而,两个节点之间的空间间隔表明,它们喷射的时间间隔约为1.2年、0.7年和0.7年,明显短于其他恒星的估计。这些H $α$图像与2015年的VLT/SPHERE/ZIMPOL档案观测结果形成对比,后者仅显示$\sim0\farcs25$处的单个结状特征。2015年和2019- 2021年之间的差异表明在六年范围内的不规则射血间隔。喷流喷射的这种变化可能与质量吸积速率的短期($<$ 1年)变化有关。我们将H $α$排放的峰值与2015年拍摄的ZIMPOL数据进行了比较,显示出由于时变质量喷射率或射流中的加热-冷却平衡,底部($<0\farcs3$)的轮廓比2020- 2021年的VAMPIRES轮廓更亮。所观察到的喷流结结构也可以归因于定常激波,但需要更高的角分辨率来确认其详细的起源。

英文摘要:

We present multi-epoch observations of the RY~Tau jet for H$α$ and [\ion{Fe}{2}] 1.644 \micron~emission lines obtained with Subaru/SCExAO+VAMPIRES, Gemini/NIFS, and Keck/OSIRIS in 2019--2021. These data show a series of four knots within 1$\arcsec$ consistent with the proper motion of $\sim$0\farcs3~yr$^{-1}$, analogous to the jets associated with another few active T-Tauri stars. However, the spatial intervals between the knots suggest the time intervals of the ejections of about 1.2, 0.7, and 0.7 years, significantly shorter than those estimated for the other stars. These H$α$ images contrast with the archival VLT/SPHERE/ZIMPOL observations from 2015, which showed only a single knot-like feature at $\sim0\farcs25$. The difference between the 2015 and 2019--2021 epochs suggests an irregular ejection interval within the six-year range. Such variations of the jet ejection may be related to a short-term ($<$1 year) variability of the mass accretion rate. We compared the peaks of the H$α$ emissions with the ZIMPOL data taken in 2015, showing the brighter profile at the base ($<0\farcs3$) than the 2020--2021 VAMPIRES profiles due to time-variable mass ejection rates or the heating-cooling balance in the jet. The observed jet knot structures may be alternatively attributed to stationary shocks, but a higher angular resolution is required to confirm its detailed origin.

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