Spiral Structure in the Gas Disk of TW Hya
Spiral Structure in the Gas Disk of TW Hya
复制标题
TW Hya 气盘中的螺旋结构
作者：
R. Teague;J. Bae;Jane Huang;E. Bergin
我们报告的检测螺旋子结构的气体速度和温度结构的磁盘周围TW Hya，暗示行星盘与一个看不见的行星的相互作用。开普勒旋转描绘出的螺旋图案的扰动被观察到在东南部的磁盘，而显着的方位角扰动的气体温度被认为是在外盘，90 Au以外，扩展的磁盘的全方位角。速度偏差为Δv/vkep <$0.1或Δvz/vkep <$0.01，取决于扰动是在旋转方向还是垂直方向，而径向扰动可以被排除。气体温度的偏差在方位角平均剖面上为±4 K，相当于ΔTgas/Tgas的偏差为± 0.05。假设所有三种结构都可以用阿基米德螺线来描述，那么速度和温度螺线的螺距角的测量结果表明，所有三种结构的螺距角都呈径向减小趋势，范围从70 Au时的9°下降到200 Au时的3°。这种低螺距角的螺旋并不容易通过先前报道的94 Au位置的嵌入式行星的尾流来解释，而是需要一个发射机制，导致更紧密的螺旋缠绕。分子发射跟踪不同的高度，在磁盘上需要准确区分螺旋发射机制。
We report the detection of spiral substructure in both the gas velocity and temperature structure of the disk around TW Hya, suggestive of planet–disk interactions with an unseen planet. Perturbations from Keplerian rotation tracing out a spiral pattern are observed in the SE of the disk, while significant azimuthal perturbations in the gas temperature are seen in the outer disk, outside 90 au, extending the full azimuth of the disk. The deviation in velocity is either Δvϕ/vkep ∼ 0.1 or Δvz/vkep ∼ 0.01 depending on whether the perturbation is in the rotational or vertical direction, while radial perturbations can be ruled out. Deviations in the gas temperature are ±4 K about the azimuthally averaged profile, equivalent to deviations of ΔTgas/Tgas ∼ 0.05. Assuming all three structures can be described by an Archimedean spiral, measurements of the pitch angles of both velocity and temperature spirals show a radially decreasing trend for all three, ranging from 9° at 70 au, dropping to 3° at 200 au. Such low pitch-angled spirals are not readily explained through the wake of an embedded planet in the location of previously reported at 94 au, but rather require a launching mechanism that results in much more tightly wound spirals. Molecular emission tracing distinct heights in the disk is required to accurately distinguish between spiral launching mechanisms.
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DOI：
10.1088/0004-637x/807/1/2
发表时间：
2015-05
期刊：
The Astrophysical Journal
影响因子：
--
作者：
L. Cleeves;E. Bergin;T. J. H. U. O. Michigan;U. Exeter
通讯作者：
L. Cleeves;E. Bergin;T. J. H. U. O. Michigan;U. Exeter
DOI：
10.3847/1538-4357/aae317
发表时间：
2018-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Huang;A. Isella;Hui Li;Shengtai Li;J. Ji
通讯作者：
P. Huang;A. Isella;Hui Li;Shengtai Li;J. Ji
影响因子：
6.5
作者：
M. Flock;J. P. Ruge;N. Dzyurkevich;T. Henning;H. Klahr;S. Wolf
通讯作者：
M. Flock;J. P. Ruge;N. Dzyurkevich;T. Henning;H. Klahr;S. Wolf
影响因子：
7.9
作者：
Andrews, Sean M.;Huang, Jane;Ricci, Luca
通讯作者：
Ricci, Luca