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arXiv 2408.16461astro-ph.EPastro-ph.SR
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间隙边缘光照能否在尘埃盘中激发旋臂?三温度辐射流体力学与近红外图像模拟

Can gap-edge illumination excite spirals in protoplanetary disks? Three-temperature radiation hydrodynamics and NIR image modelling

Dhruv Muley, Julio David Melon Fuksman, Hubert Klahr

AI总结:

本文通过三温度辐射流体力学模拟与近红外图像建模,发现中等质量行星可通过恒星辐射与间隙边缘不对称性相互作用间接激发比传统 Lindblad 旋臂更显著的盘旋臂结构。

摘要:

高分辨率近红外仪器(如 VLT/SPHERE 和 Gemini/GPI)的出现,帮助揭示了行星形成盘中的大量亚结构,包括 MWC 758、SAO 206462 和 V1247 Ori 等盘中显著的大型旋臂。在经典的盘-行星相互作用理论中,这些旋臂与多倍木星质量伴星驱动的 Lindblad 共振一致。尽管探测极限不断提高,但关于此类大质量天体与旋臂亚结构之间联系的证据仍不明确。为寻找替代解释,我们使用 PLUTO 代码在低质量盘中运行三维流体力学模拟,采用两种相对较低的行星质量(土星质量、木星质量)和两种热力学处理方式(三温度辐射流体力学,以及更传统的 β 冷却)。在辐射情形下,一个 m = 2 模式(可能归因于恒星辐射与间隙边缘不对称性的相互作用)产生了方位角压力梯度,进而在盘的上层形成显著的旋臂。使用 RADMC3D 进行的蒙特卡洛辐射转移(MCRT)后处理表明,在近红外散射光中,对于所测试质量范围内的行星,这些间隙边缘旋臂比传统的 Lindblad 旋臂显著得多。我们的结果表明,即使是中等质量的原行星——比超级木星更难探测但更为普遍——也能够间接诱导大尺度旋臂盘特征,并强调了在努力重现观测结果时纳入辐射物理的重要性。

英文摘要:

The advent of high-resolution, near-infrared instruments such as VLT/SPHERE and Gemini/GPI has helped uncover a wealth of substructure in planet-forming disks, including large, prominent spiral arms in MWC 758, SAO 206462, and V1247 Ori among others. In the classical theory of disk-planet interaction, these arms are consistent with Lindblad-resonance driving by multi-Jupiter-mass companions. Despite improving detection limits, evidence for such massive bodies in connection with spiral substructure has been inconclusive. In search of an alternative explanation, we use the PLUTO code to run 3D hydrodynamical simulations with two comparatively low planet masses (Saturn-mass, Jupiter-mass) and two thermodynamic prescriptions (three-temperature radiation hydrodynamics, and the more traditional $β$-cooling) in a low-mass disk. In the radiative cases, an $m = 2$ mode, potentially attributable to the interaction of stellar radiation with gap-edge asymmetries, creates an azimuthal pressure gradient, which in turn gives rise to prominent spiral arms in the upper layers of the disk. Monte Carlo radiative transfer (MCRT) post-processing with RADMC3D reveals that in near-infrared scattered light, these gap-edge spirals are significantly more prominent than the traditional Lindblad spirals for planets in the mass range tested. Our results demonstrate that even intermediate-mass protoplanets -- less detectable, but more ubiquitous, than super-Jupiters -- are capable of indirectly inducing large-scale spiral disk features, and underscore the importance of including radiation physics in efforts to reproduce observations.

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