arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2303.05064astro-ph.EPastro-ph.SR
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SR 21 原行星盘中的多个环与不对称结构

Multiple Rings and Asymmetric Structures in the Disk of SR 21

Yi Yang, Hauyu Baobab Liu, Takayuki Muto, Jun Hashimoto, Ruobing Dong, Kazuhiro Kanagawa, Munetake Momose, Eiji Akiyama, Yasuhiro Hasegawa, Takashi Tsukagoshi, … 展开作者

Yi Yang, Hauyu Baobab Liu, Takayuki Muto, Jun Hashimoto, Ruobing Dong, Kazuhiro Kanagawa, Munetake Momose, Eiji Akiyama, Yasuhiro Hasegawa, Takashi Tsukagoshi, Mihoko Konishi, Motohide Tamura

AI总结:

本文分析了 T-Tauri 恒星 SR 21 周围原行星盘的 ALMA 数据,发现了两个环和三个不对称结构,提出最大尘埃尺寸的两组解,并指出南部的显著旋臂可能是捕获尘埃的涡旋,为研究行星形成提供了良好目标。

摘要:

在原行星盘中发现的类似新月形的不对称尘埃结构表明了尘埃的聚集。因此,对它们的研究有助于我们理解行星形成过程。在此,我们分析了 T-Tauri 恒星 SR 21 周围原行星盘的 ALMA 数据,该盘在先前的亚毫米波观测中已探测到不对称结构。在 ALMA Band 6(1.3 mm)以约 0.$\arcsec$04 的空间分辨率成像,发现该盘由两个环和三个不对称结构组成,其中两个不对称结构位于同一个环中。与 Band 6 图像相比,Band 3(2.7 mm)图像也显示了这三个不对称结构,但带有一些团块。外环中拉长的不对称结构可能是由于一颗正在生长的行星的相互作用所致。通过对 Band 3 和 Band 6 尘埃连续谱数据进行拟合,提出了盘内最大尘埃尺寸的两组解:一组大于 1 mm,另一组小于 300 $\mu$m。在更长波长下的高分辨率连续谱观测以及偏振观测有助于打破简并。我们还提出,先前在 VLT/SPHERE 观测中识别出的位于恒星以南 0.$\arcsec$25 处的显著旋臂,可能是内弧的散射光对应物,该结构本质上是一个捕获尘埃的涡旋。在 SR 21 中发现的这些特征使其成为研究不对称结构演化和行星形成的良好目标。

英文摘要:

Crescent-like asymmetric dust structures discovered in protoplanetary disks indicate dust aggregations. Thus, the research on them helps us understand the planet formation process. Here we analyze the ALMA data of the protoplanetary disk around the T-Tauri star SR 21, which has asymmetric structures detected in previous sub-millimeter observations. Imaged at ALMA Band 6 (1.3 mm) with a spatial resolution of about 0.$\arcsec$04, the disk is found to consist of two rings and three asymmetric structures, with two of the asymmetric structures being in the same ring. Compared to the Band 6 image, the Band 3 (2.7 mm) image also shows the three asymmetric structures but with some clumps. The elongated asymmetric structures in the outer ring could be due to the interactions of a growing planet. By fitting the Band 3 and Band 6 dust continuum data, two branches of solutions of maximum dust size in the disk are suggested: one is larger than 1 mm, and the other is smaller than 300 $μm$. High-resolution continuum observations at longer wavelengths as well as polarization observations can help break the degeneracy. We also suggest that the prominent spiral previously identified in VLT/SPHERE observations to the south of the star at 0.$\arcsec$25 may be the scattered light counterpart of the Inner Arc, and the structure is a dust-trapping vortex in nature. The discovered features in SR 21 make it a good target for studying the evolution of asymmetric structures and planet formation.

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。

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