PDS 70内盘中的磁驱动盘风
A magnetically driven disc wind in the inner disc of PDS 70
AI总结：
本研究通过X-Shooter和HARPS光谱在PDS 70中首次探测到[O I] 6300Å风示踪线，并结合He I 10830Å发射，提出其近星内盘存在磁驱动风，可能协助巨行星清除内盘。
摘要：
PDS 70是迄今为止唯一一个通过直接成像探测到多颗行星的年轻星盘。该星盘在亚毫米和近红外（NIR）波段观测时呈现出一个巨大的空腔，其中拥有两颗大质量行星。这使PDS 70成为研究由两颗巨行星塑造的、物质强烈耗竭的内盘中物理条件的理想目标，尤其可用于检验盘风是否能在其演化中发挥重要作用。利用X-Shooter和HARPS光谱，我们首次探测到示踪风的[O I] 6300Å谱线，并证实了文献中低至中等的质量吸积率数值。与邻近恒星形成区中大量具有空腔的星盘样本相比，[O I]谱线光度相对于吸积光度较高。[O I]谱线的半高全宽（FWHM）和蓝移峰值表明发射来自非常靠近恒星的区域，支持其起源于磁驱动风。我们还在He I 10830Å谱线中探测到风发射和高变率，这在低吸积天体中并不常见。我们认为，尽管PDS 70的空腔显然是由巨行星雕刻而成，但显著的内盘风也可能对清除内盘作出了重要贡献。
英文摘要：
PDS 70 is so far the only young disc where multiple planets have been detected by direct imaging. The disc has a large cavity when seen at sub-mm and NIR wavelengths, which hosts two massive planets. This makes PDS 70 the ideal target to study the physical conditions in a strongly depleted inner disc shaped by two giant planets, and in particular to test whether disc winds can play a significant role in its evolution. Using X-Shooter and HARPS spectra, we detected for the first time the wind-tracing [O I] 6300AA line, and confirm the low-moderate value of mass-accretion rate in the literature. The [O I] line luminosity is high with respect to the accretion luminosity when compared to a large sample of discs with cavities in nearby star-forming regions. The FWHM and blue-shifted peak of the [O I] line suggest an emission in a region very close to the star, favouring a magnetically driven wind as the origin. We also detect wind emission and high variability in the He I 10830AA line, which is unusual for low-accretors. We discuss that, although the cavity of PDS 70 was clearly carved out by the giant planets, the substantial inner disc wind could also have had a significant contribution to clearing the inner-disc.
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