论文标题
通过对金牛座的苔丝观察来了解积聚的变异性
Understanding Accretion Variability Through TESS Observations of Taurus
论文作者
论文摘要
解释积聚，年轻的低质量恒星的短期变异性被称为古典T陶里恒星仍然是一项开放的任务。长达一个月的连续光曲线来自过渡系外行星调查卫星（\ textit {tess}），已用于数百个T牛里星。借助此庞大的数据集，识别\ tess观察到的变异性与短期积分变异性之间的连接对于表征增生过程是有价值的。为此，我们获得了金牛座恒星形成区中14台Tauri星的短期\ tess观测，以及同时基于地面的Ubvri波段光度法，可用作增生诊断。此外，我们将数据集与先前发表的同时发表的nuv-nir \ textit {Hubble Space望远镜} Spectra for Shamp中的一个成员。我们发现有证据表明，在\ tess光曲线中观察到的许多短期变异性都可以归因于增生率的变化，但请注意，在单独的夜晚和物体之间存在显着的散射。我们确定数据集中的时间滞后的提示，这些滞后在较短的波长下增加，我们认为这可能是吸积柱纵向密度分层的证据。我们的结果表明，同时的多波长观察对于为观察到的这些恒星的可变性提供背景至关重要。
Interpreting the short-timescale variability of the accreting, young, low-mass stars known as Classical T Tauri stars remains an open task. Month-long, continuous light curves from the Transiting Exoplanet Survey Satellite (\textit{TESS}) have become available for hundreds of T Tauri stars. With this vast data set, identifying connections between the variability observed by \TESS and short-timescale accretion variability is valuable for characterizing the accretion process. To this end, we obtained short-cadence \TESS observations of 14 T Tauri stars in the Taurus star-formation region along with simultaneous ground-based, UBVRI-band photometry to be used as accretion diagnostics. In addition, we combine our dataset with previously published simultaneous NUV-NIR \textit{Hubble Space Telescope} spectra for one member of the sample. We find evidence that much of the short-timescale variability observed in the \TESS light curves can be attributed to changes in the accretion rate, but note significant scatter between separate nights and objects. We identify hints of time lags within our dataset that increase at shorter wavelengths which we suggest may be evidence of longitudinal density stratification of the accretion column. Our results highlight that contemporaneous, multi-wavelength observations remain critical for providing context for the observed variability of these stars.
