INDIRECT DETECTION OF FORMING PROTOPLANETS VIA CHEMICAL ASYMMETRIES IN DISKS
INDIRECT DETECTION OF FORMING PROTOPLANETS VIA CHEMICAL ASYMMETRIES IN DISKS
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DOI：
10.1088/0004-637x/807/1/2
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
L. Cleeves;E. Bergin;T. J. H. U. O. Michigan;U. Exeter
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文献类型：
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作者：
L. Cleeves;E. Bergin;T. J. H. U. O. Michigan;U. Exeter
我们研究了由于嵌入在狭窄的星周盘间隙内的自发光行星伴星而增加的加热所导致的分子丰度变化。使用包括恒星和行星辐射在内的3D模型，我们发现发光的年轻行星局部加热母星周盘数十开尔文，导致分子物种的有效热解吸，否则这些分子物种就会被局部冻结。此外，加热沉积在圆盘的大片区域，半径±5 AU，跨度≤60°？>方位。从三维化学模型中，我们计算了旋转线发射模型和完整的阿塔卡马大型毫米波阵列模拟，发现这颗年轻行星的化学特征在10小时内可以检测到化学不对称。>观察。对于这里考虑的模型来说，HCN及其同位素是行星加热的特别清晰的示踪剂，并且可以检测到同一物种的多次跃迁的发射，这不仅编码了光谱本身可能的速度信息，还编码了温度信息。我们发现亚毫米分子发射将是研究气态巨行星原位形成的有用工具，特别是在R > 10 ？>非盟。
We examine changes in the molecular abundances resulting from increased heating due to a self-luminous planetary companion embedded within a narrow circumstellar disk gap. Using 3D models that include stellar and planetary irradiation, we find that luminous young planets locally heat up the parent circumstellar disk by many tens of Kelvin, resulting in efficient thermal desorption of molecular species that are otherwise locally frozen out. Furthermore, the heating is deposited over large regions of the disk, ±5 AU radially and spanning ≲ 60 ° ?> azimuthally. From the 3D chemical models, we compute rotational line emission models and full Atacama Large Millimeter Array simulations, and find that the chemical signatures of the young planet are detectable as chemical asymmetries in ∼ 10 h ?> observations. HCN and its isotopologues are particularly clear tracers of planetary heating for the models considered here, and emission from multiple transitions of the same species is detectable, which encodes temperature information in addition to possible velocity information from the spectra itself. We find submillimeter molecular emission will be a useful tool to study gas giant planet formation in situ, especially beyond R ≳ 10 ?> AU.