论文标题
光蒸发风中的灰尘夹带：X射线的影响
Dust entrainment in photoevaporative winds: The impact of X-rays
论文作者
论文摘要
X射线和EUV-（XEUV-）驱动的光蒸发风在年轻的T-Tauri恒星周围作用于原球磁盘上，可能会影响磁盘的演化，从而影响气体和灰尘分布。我们研究了XEUV驱动的光蒸发风中的灰尘夹带，并将我们的结果与现有的MHD和仅EUV模型进行了比较。对于$ l_x = 2 \ cdot 10^{30} \，\ Mathrm {erg/s} $的X射线光度，由$ m_* = 0.7 \，\ Mathrm {m} _ \ odot $ j = 0.7 \，\ odot $ star发出\ cdot 10^{ - 8} \，\ Mathrm {m_ \ odot/yr} $，我们从$ 25 \，$ au（$ 120 \ $ au（$ 120 \，$ au）中找到了尺寸$ a_0 \ lyssim 11 \，μ$ m（$ 9 \，μ$ m）的灰尘夹带。这是用$ \ dot {m} _ \ mathrm {w} \ simeq 10^{ - 10} \，\ mathrm {m_ \ odot/yr} $提高对灰尘夹带的增强。我们的数值模型还显示了灰尘轨迹与气体流线的偏差，即使对于$ $ $ M级的颗粒也是如此。此外，我们发现夹带谷物的大小与它们在流出中达到的最大高度之间存在相关性。
X-ray- and EUV- (XEUV-) driven photoevaporative winds acting on protoplanetary disks around young T-Tauri stars may crucially impact disk evolution, affecting both gas and dust distributions. We investigate the dust entrainment in XEUV-driven photoevaporative winds and compare our results to existing MHD and EUV-only models. For an X-ray luminosity of $L_X = 2 \cdot 10^{30}\,\mathrm{erg/s}$ emitted by a $M_* = 0.7\,\mathrm{M}_\odot$ star, corresponding to a wind mass-loss rate of $\dot{M}_\mathrm{w} \simeq 2.6 \cdot 10^{-8} \,\mathrm{M_\odot/yr}$, we find dust entrainment for sizes $a_0 \lesssim 11\,μ$m ($9\,μ$m) from the inner $25\,$AU ($120\,$AU). This is an enhancement over dust entrainment in less vigorous EUV-driven winds with $\dot{M}_\mathrm{w} \simeq 10^{-10}\,\mathrm{M_\odot/yr}$. Our numerical model also shows deviations of dust grain trajectories from the gas streamlines even for $μ$m-sized particles. In addition, we find a correlation between the size of the entrained grains and the maximum height they reach in the outflow.
