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arXiv 2201.12108astro-ph.EPastro-ph.SR
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光蒸发风中的尘埃夹带:过渡盘的综合观测

Dust entrainment in photoevaporative winds: Synthetic observations of transition disks

R. Franz, G. Picogna, B. Ercolano, S. Casassus, T. Birnstiel, Ch. Rab, S. Pérez

摘要:

X射线和极紫外(XEUV)驱动的光蒸发风作用于年轻的T-Tauri恒星周围的原行星盘,可能会强烈影响盘的演化,影响气体和尘埃的分布。我们计算尘埃密度的风区域的XEUV照射的过渡盘的间隙大小为20和30 AU,并确定它们是否可以观察到在波长$0.7 \lesssim λ_\mathrm{obs} [μ\mathrm{m}] \lesssim 1.8$的散射和偏振光与当前的仪器。对于一个由XEUV驱动的流出物围绕着一颗带有$L_X = 2 \cdot 10^{30} \mathrm{erg/s}$的$M_* = 0.7 \mathrm{M}_\odot$ T-Tauri恒星,我们发现尘埃的质量损失率为$\dot{M}_\mathrm{dust} \lesssim 2.0 \cdot 10^{-3} \dot{M}_\mathrm{gas}$,如果我们调用垂直沉降,流出物是相当准直的。合成的图像显示出明显的烟囱状结构。这些烟囱的相对强度较低,但在最佳条件下,它们的检测仍然是可行的,目前的仪器,如JWST NIRCam和SPHERE IRDIS。

英文摘要:

X-ray- and extreme-ultraviolet- (XEUV-) driven photoevaporative winds acting on protoplanetary disks around young T-Tauri stars may strongly impact disk evolution, affecting both gas and dust distributions. We compute dust densities for the wind regions of XEUV-irradiated transition disks with gap sizes of 20 and 30 AU, and determine whether they can be observed at wavelengths $0.7 \lesssim λ_\mathrm{obs} [μ\mathrm{m}] \lesssim 1.8$ in scattered and polarised light with current instrumentation. For an XEUV-driven outflow around a $M_* = 0.7 \mathrm{M}_\odot$ T-Tauri star with $L_X = 2 \cdot 10^{30} \mathrm{erg/s}$, we find dust mass-loss rates $\dot{M}_\mathrm{dust} \lesssim 2.0 \cdot 10^{-3} \dot{M}_\mathrm{gas}$, and if we invoke vertical settling, the outflow is quite collimated. The synthesised images exhibit a distinct chimney-like structure. The relative intensity of these chimneys is low, but under optimal conditions, their detection may still be feasible with current instrumentation such as JWST NIRCam and SPHERE IRDIS.

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