木星平流层成分的ASTE观测：彗星撞击后19年的一硫化碳（$J$ =7- 6）探测
ASTE Observation of Jupiter's Stratospheric Composition: Detection of Carbon Monosulfide ($J$=7--6) in 19 Years After the Cometary Impact
摘要：
在木星的平流层中，气态的一硫化碳（CS）是在1994年通过毫米波和紫外线观测首次发现的，是由苏梅克-列维9号彗星（SL 9）碰撞引起的产物。{To约束硫化学，在2013年，SL 9事件19年后，我们使用阿塔卡马亚毫米望远镜实验（ASTE）10米单碟望远镜在0.8 mm波长处观测到木星平流层CS $J$ =7 - 6旋转跃迁。在天线温标中成功地探测到了强度为120 mK的CS分子谱线。获得的CS总质量显示$\sim$ 90 $\%$相对于1998年观察到的降低。根据线形分析，建议CS存在于0.2 $^{+0.4}_{-0.15}$ mbar压力水平以上，这与1998年由SL 9提供的CS测定值相当，在高达2.0 mbar压力区域观察到CS。CS垂直分布与\ce{H2O}的差异及其总质量的减少可能归因于CS在木星平流层0.2毫巴以下高度区域的化学损失。
英文摘要：
In Jupiter's stratosphere, gaseous carbon monosulfide (CS) was first discovered in 1994 by millimeter and ultraviolet observations as a product induced by the collision of comet Shoemaker-Levy 9 (SL9). {To constrain sulfur chemistry, in 2013, 19 years after the SL9 event, we observed Jupiter's stratospheric CS $J$=7 -- 6 rotational transition at 0.8 mm wavelength by using the Atacama Submillimeter Telescope Experiment (ASTE) 10-m single dish telescope. The CS molecular line was successfully detected with 120 mK intensity in the antenna temperature scale. The obtained CS total mass shows $\sim$90$\%$ decrease relative to that observed in 1998. From the line shape analysis, CS is suggested to be present above the 0.2$^{+0.4}_{-0.15}$ mbar pressure level, which is comparable to that of determined in 1998 which was provided by SL9 along with CS, was observed up to the 2.0 mbar pressure region. The discrepancy of CS vertical distribution with \ce{H2O} and the decrease in its total mass may be attributed to the chemical loss of CS in Jupiter's stratosphere lower than the 0.2 mbar altitude region.
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