论文标题
来自Centaur 29p/Schwassmann-Wachmann的Co气体和尘埃爆发
CO gas and dust outbursts from Centaur 29P/Schwassmann-Wachmann
论文作者
论文摘要
29p/Schwassmann Wachmann是一个不寻常的太阳系对象。它最初被归类为短期彗星，现在被称为最近转移到当前轨道的半人马，并可能成为木星家庭彗星。它表现出90多年的灰尘昏迷，并经常发生大量的尘埃爆发。一氧化碳通常以大量量检测到，通常被认为在产生静止的灰尘昏迷和爆发方面发挥了重要作用。为了检验这一假设，我们使用亚利桑那无线电观测站10m亚毫米毫米望远镜在2016年和2018 - 2019年期间完成了两个3个月的CO J = 2-1旋转线的活动，并将结果与同时获得的可见磁性进行了比较。当Centaur接近2019年的围赛时，静止的灰尘昏迷在亮度上增长了$ 45 \％，而尚不清楚静态CO的生产率是否也增加。 2016年2月28.6 UT的CO生产率增加了一倍，并未引发爆发或至少10天的灰尘产量增加。同样，2018年发生了两次尘埃爆发，而CO产量仍以静止的速度持续。另外两个尘埃爆发可能显示出气体参与。数据表明，共同和尘埃爆炸并不总是相关的。如果CO并不总是与原子核中的灰尘成分合并，或者CO主要通过多孔材料释放，则可以解释这一点。此外，其他次要挥发物或物理过程可能有助于产生灰尘爆发。
29P/Schwassmann Wachmann is an unusual solar system object. Originally classified as a short-period comet, it is now known as a Centaur that recently transferred to its current orbit, and may become a Jupiter Family comet. It has exhibited a dust coma for over 90 years, and regularly undergoes significant dust outbursts. Carbon monoxide is routinely detected in high amounts and is typically assumed to play a large role in generating the quiescent dust coma and outbursts. To test this hypothesis, we completed two 3-month long observing campaigns of the CO J=2-1 rotational line using the Arizona Radio Observatory 10m Sub-millimeter Telescope during 2016 and 2018-2019, and compared the results to visible magnitudes obtained at the same time. As the Centaur approached its 2019 perihelion, the quiescent dust coma grew $\sim$45\% in brightness, while it is unclear whether the quiescent CO production rate also increased. A doubling of the CO production rate on 2016 Feb 28.6 UT did not trigger an outburst nor a rise in dust production for at least 10 days. Similarly, two dust outbursts occurred in 2018 while CO production continued at quiescent rates. Two other dust outbursts may show gas involvement. The data indicate that CO- and dust-outbursts are not always well-correlated. This may be explained if CO is not always substantially incorporated with the dust component in the nucleus, or if CO is primarily released through a porous material. Additionally, other minor volatiles or physical processes may help generate dust outbursts.
