标题： JWST探测到一个轨道偏置原行星盘中的尘埃耗尽现象的证据 显示英文标题

标题： Evidence for Dust Depletion in a Misaligned Protoplanetary Disk with JWST

摘要： 此处我们报告了利用JWST MIRI光谱在UX Tau A周围错位的内盘中检测到尘埃耗尽现象。 Spitzer检测到该盘中的中红外（MIR）连续谱“跷跷板”变化，并将其归因于内盘对外盘投下的可变阴影。 JWST MIRI光谱也显示UX Tau A存在跷跷板变化，但在10微米以下的发射显著减少，几乎达到光球水平。 我们认为UX Tau A的MIR连续谱变化是由于错位的内盘中尘埃的耗尽所致。 我们推测这种尘埃耗尽发生是因为内盘与外盘错位，这可能会破坏内盘从外盘获得补充。 通过同时测量UX Tau A的质量吸积率，并估算产生Spitzer观测中MIR过量所需的尘埃量，我们估计了一个最小的尘埃耗尽时间尺度约为0.1年。 这些观测表明，我们可以通过MIR连续谱变化间接检测错位内盘的特征，并且在某些情况下，内盘可能显著地缺乏尘埃并变得光学薄。 显示英文摘要

摘要： Here we report the detection of dust depletion in a misaligned inner disk around UX Tau A using JWST MIRI spectra. Mid-infrared (MIR) continuum "seesaw" variability was detected in this disk by Spitzer and attributed to variable shadows cast on the outer disk by the inner disk. The JWST MIRI spectrum of UX Tau A also shows seesaw variability, but with a significant decrease of emission shortwards of 10 micron to nearly photospheric levels. We argue that UX Tau A's MIR continuum variability is due to depletion of dust in a misaligned inner disk. We speculate that this dust depletion occurs because the inner disk is misaligned from the outer disk, which can disrupt the replenishment of the inner disk from the outer disk. Using contemporaneous measurements of the mass accretion rate of UX Tau A and estimating the amount of dust necessary to produce the MIR excess in the Spitzer observations, we estimate a minimum dust depletion timescale of ~0.1 yr. These observations show that we can indirectly detect the signatures of misaligned inner disks through MIR continuum variability and that in some cases the inner disk may be significantly depleted of dust and become optically thin.