arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2305.06014astro-ph.EPastro-ph.IM
收藏

过渡盘尘埃连续谱发射中光蒸发特征的可观测性

Observability of Photoevaporation Signatures in the Dust Continuum Emission of Transition Discs

Giovanni Picogna, Carolina Schäfer, Barbara Ercolano, Christian Rab, Rafael Franz, Matías Gárate

AI总结:

本文通过辐射流体动力学模拟研究过渡盘,发现光蒸发空腔的陡度与1木星质量行星相似,但由于尘埃过滤效率较低,空腔内尘埃密度下降较缓,导致光谱指数特征不同,结合两者可揭示过渡盘真实性质。

摘要:

光蒸发盘风在我们对环星盘演化的理解中起着关键作用,尤其是在最后阶段,并且它们可能会影响行星形成过程以及行星的最终位置。过渡盘(即具有中心尘埃空腔的盘)的研究对于理解光蒸发过程和盘消散至关重要。然而,我们需要区分由光蒸发产生的空腔与由巨行星产生的空腔。理论模型对于识别这两种不同过程可能的观测特征是必要的,而寻找这两个过程之间差异的模型仍然缺乏。在本文中,我们研究了从内部光蒸发盘的辐射流体动力学模拟中获得的过渡盘样本,并重点关注与当前 ALMA 观测相关的尘埃动力学。然后我们将我们的结果与超级地球/巨行星打开的间隙进行了比较,发现光蒸发空腔的陡度对间隙大小有轻微的依赖性,并且类似于 1 木星质量行星的情况。然而,由于尘埃过滤效率较低,与行星情况相比,光蒸发空腔内部的尘埃密度下降得不那么迅速。这种效应在产生的光谱指数中是可见的,与行星情况相比,它在空腔边缘显示出更大的光谱指数,并且在空腔内部呈现出较浅的增大。空腔陡度和光谱指数的结合可能会揭示过渡盘的真实性质。

英文摘要:

Photoevaporative disc winds play a key role in our understanding of circumstellar disc evolution, especially in the final stages, and they might affect the planet formation process and the final location of planets. The study of transition discs (i.e. discs with a central dust cavity) is central for our understanding of the photoevaporation process and disc dispersal. However, we need to distinguish cavities created by photoevaporation from those created by giant planets. Theoretical models are necessary to identify possible observational signatures of the two different processes, and models to find the differences between the two processes are still lacking. In this paper we study a sample of transition discs obtained from radiation-hydrodynamic simulations of internally photoevaporated discs, and focus on the dust dynamics relevant for current ALMA observations. We then compared our results with gaps opened by super Earths/giant planets, finding that the photoevaporated cavity steepness depends mildly on gap size, and it is similar to that of a 1 Jupiter mass planet. However, the dust density drops less rapidly inside the photoevaporated cavity compared to the planetary case due to the less efficient dust filtering. This effect is visible in the resulting spectral index, which shows a larger spectral index at the cavity edge and a shallower increase inside it with respect to the planetary case. The combination of cavity steepness and spectral index might reveal the true nature of transition discs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑