论文标题
No Lup的III级别圆盘的Rapid Co气体分散
Rapid CO gas dispersal from NO Lup's class III circumstellar disc
论文作者
论文摘要
我们在对1-3 Myr狼疮协会的ALMA调查中观察到K7 III类NO LUP，并检测到了偶尔粉尘和CO气体。在这里，我们表明J = 3-2 CO发射在光谱和空间上均已解决，其宽度宽度$ {\ sim} 19 $ kmms $^{ - 1} $，其已解决的尺寸$ {\ sim} $ {\ sim} 1'''$（$ {\ sim} 130 $ au）。我们将气体排放量建模为开普勒圆盘，发现一致性，但仅以$ {\ sim} 11m _ {\ odot} $的中心质量，鉴于其光谱类型和X-Shooter Spectrum，这是令人难以置信的。还可以通过将CO排放建模为具有径向速度$ {\ sim} 22 $ kmms $^{ - 1} $的流出气体来找到数据。我们没有将LUP的CO排放解释为第一个成像的III类静态光盘，并具有溢出的气体。我们得出的结论是，CO不断补充，但不能说这是来自冰冷的行星的破裂还是来自原球盘的最后残留物。我们建议进一步的工作来探索该CO的起源，并且与光蒸发模型相比，它的速度高于预期的速度。
We observed the K7 class III star NO Lup in an ALMA survey of the 1-3 Myr Lupus association and detected circumstellar dust and CO gas. Here we show that the J = 3-2 CO emission is both spectrally and spatially resolved, with a broad velocity width ${\sim}19$kms$^{-1}$ for its resolved size ${\sim}1''$ (${\sim}130$ au). We model the gas emission as a Keplerian disc, finding consistency, but only with a central mass of ${\sim}11M_{\odot}$, which is implausible given its spectral type and X-Shooter spectrum. A good fit to the data can also be found by modelling the CO emission as outflowing gas with a radial velocity ${\sim}22$kms$^{-1}$. We interpret NO Lup's CO emission as the first imaged class III circumstellar disc with outflowing gas. We conclude that the CO is continually replenished, but cannot say if this is from the break-up of icy planetesimals or from the last remnants of the protoplanetary disc. We suggest further work to explore the origin of this CO, and its higher than expected velocity in comparison to photoevaporative models.
