文章基本信息

标题：A Ringed Pole-on Outflow from DO Tauri Revealed by ALMA
本地全文：下载
作者：Manuel Fernández-López ; Luis A.Zapata ; Luis F.Rodríguez 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：4
页码：2373-2387
DOI：10.3847/1538-3881/ab7a10
语种：English
出版社：American Institute of Physics
摘要：We present new Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations including the CO(2−1) line and 1.3 mm continuum emission from the surroundings of the young stellar object DO Tauri.The ALMA CO molecular data show three different series of rings at different radial velocities.These rings have radii around 220 and 800 au.We make individual fits to the rings and note that their centers are aligned with DO Tauri and its optical high-velocity jet.In addition, we notice that the velocity of these structures increases with the separation from the young star.We discuss the data under the hypothesis that the rings represent velocity cuts through three outflowing shells that are possibly driven by a wide-angle wind, dragging the environment material along a direction close to the line of sight (i = 19°).We estimate the dynamical ages, the mass, the momentum, and the energy of each individual outflow shell and those of the whole outflow.The results are in agreement with those found in outflows from Class II sources.We make a rough estimate for the size of the jet/wind launching region, which needs to be of lesssim15 au.We report the physical characteristics of DO Tauri's disk continuum emission (almost face-on and with a projected major axis in the north–south direction) and its velocity gradient orientation (north–south), indicative of disk rotation for a 1–2 M⊙ central star.Finally, we show a Hubble Space Telescope [S ii] image of the optical jet and report a measurement of its orientation in the plane of the sky.
关键词：Interstellar medium;Protoplanetary disks;Stellar jets;Young stellar objects