ALMA detection of hydrogen cyanide in the atmosphere of Saturn

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
ARIJIT MANNA, SABYASACHI PAL
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Abstract

In the planetary atmosphere, hydrogen cyanide (HCN) is an important nitrogen (N)-bearing molecule that plays a key role in the formation of several biomolecules via chain reactions. The presence of HCN characterizes the stratospheric composition of the solar gas planets and exoplanets. For several years, many observations have failed to identify the rotational and vibrational emission lines of HCN from the atmosphere of Saturn using ground- and space-based radio telescopes. We present the successful detection of the rotational emission line of HCN from the atmosphere of Saturn using the Atacama Large Millimeter/Submillimeter Array (ALMA) band 7. We detected the \(\textrm{J} = 4\)–3 transition line of the HCN from the eastern and western limbs of Saturn with \({\ge }5\sigma \) statistical significance. The derived abundances of HCN in the western and eastern limbs are 6.19 and 2.90 ppb, respectively. We claim that HCN is formed in the atmosphere of Saturn via the photolysis of methane (\(\hbox {CH}_{4}\)) and ammonia (\(\hbox {NH}_{3}\)).

ALMA 探测到土星大气中的氰化氢
在行星大气中,氰化氢(HCN)是一种重要的含氮(N)分子,在通过链式反应形成多种生物大分子的过程中发挥着关键作用。HCN 的存在是太阳气体行星和系外行星平流层成分的特征。几年来,利用地面和空间射电望远镜进行的多次观测都未能从土星大气中识别出 HCN 的旋转和振动发射线。我们利用阿塔卡马大型毫米波/亚毫米波阵列(ALMA)波段 7 成功探测到了土星大气中的 HCN 旋转发射线。我们从土星的东侧和西侧探测到了HCN的\(textrm{J} = 4\)-3 过渡线,其统计意义为\({\ge }5\sigma \)。得出的土星西肢和东肢的六氯化萘丰度分别为 6.19 和 2.90 ppb。我们认为土星大气中的六氯化萘是通过甲烷(\(\hbox {CH}_{4}\))和氨(\(\hbox {NH}_{3}\))的光解形成的。
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来源期刊
Journal of Astrophysics and Astronomy
Journal of Astrophysics and Astronomy 地学天文-天文与天体物理
CiteScore
1.80
自引率
9.10%
发文量
84
审稿时长
>12 weeks
期刊介绍: The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published. Articles submitted as letters will be considered.
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