Chemical signatures of a warped protoplanetary disc

Chemical signatures of a warped protoplanetary disc
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扭曲的原行星盘的化学特征

DOI:
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发表时间:
2021
期刊:
影响因子:
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通讯作者:
C. Pinte
C. Pinte
中科院分区:
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文献类型:
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作者:
Alison K. Young;R. Alexander;C. Walsh;R. Nealon;A. Booth;C. Pinte

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如果有恒星或行星伴星的轨道与星盘不一致,星周盘可能会弯曲或破碎成不同的平面。越来越多的观测证据表明,原行星盘的内盘和翘曲可能是由于与以前未被探测到的伴星的相互作用造成的,这给了我们一个诱人的迹象,表明可能有行星在那里形成。流体动力学和辐射传递模型表明,由于盘面与恒星的角度不同,翘曲盘中的温度呈方位角变化,这影响了盘的化学性质。我们在原行星盘的流体动力学模型的基础上进行了化学建模,其中嵌入了一颗行星,其轨道与圆盘呈12◦倾角。即使是这种微小的偏差,包括CO和HCO+在内的物种丰度也会在方位角上发生变化,这导致了亚毫米线发射中可检测到的方位角变化。因此,线发射的方位角变化可能表明存在一个看不见的嵌入伴星。在解释扭曲或阴影原行星盘的分子线图时,应考虑非轴对称化学丰度。
Circumstellar discs may become warped or broken into distinct planes if there is a stellar or planetary companion with an orbit that is misaligned with respect to the disc. There is mounting observational evidence for protoplanetary discs with misaligned inner discs and warps that may be caused by such interactions with a previously undetected companion, giving us a tantalising indication of possible planets forming there. Hydrodynamical and radiative transfer models indicate that the temperature varies azimuthally in warped discs due to the variable angle at which the disc surface faces the star and this impacts the disc chemistry. We perform chemical modelling based on a hydrodynamical model of a protoplanetary disc with an embedded planet orbiting at a 12◦ inclination to the disc. Even for this small misalignment, abundances of species including CO and HCO+ vary azimuthally and this results in detectable azimuthal variations in submillimetre line emission. Azimuthal variations in line emission may therefore indicate the presence of an unseen embedded companion. Nonaxisymmetric chemical abundances should be considered when interpreting molecular line maps of warped or shadowed protoplanetary discs.
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