行星形成尺度上的ALMA分子巡天(MAPS). XV. 示踪20 au内的原行星盘结构
地球与行星天体物理
2021-11-17 v2
摘要
约束原行星盘内20 au气体的尘埃分布是困难的。同时，该区域被认为负责大多数行星形成，尤其是3-10 au处的水冰线周围。在气体处于开普勒盘假设下，我们利用行星形成尺度上的ALMA分子巡天(MAPS) ALMA大计划的极高灵敏度，使用谱线速度轮廓为CO同位素体J=2-1谱线构建有效分辨率约3 au的径向表面亮度轮廓。IM Lup在CO和CO中揭示中心凹陷，归因为内20 au中约500 尘埃的堆积，导致气体-尘埃比约<10。该堆积与颗粒的高效漂移（ 100 Myr）及暗示溪流不稳定性可能活跃的局地气体-尘埃比一致。GM Aur盘中CO同位素体发射与~40 au尘埃空腔内的小（~15 au）强耗减气体空腔一致。AS 209和HD 163296盘的径向表面亮度轮廓在已知尘埃环（~14 au）和尘埃缝（~10 au）位置分别显示CO发射的局地极小和极大。这表明尘埃环具有低气体-尘埃比（10），且尘埃缝气体足够丰富以拥有光学厚CO。
引用
@article{arxiv.2109.06223,
title = {Molecules with ALMA at Planet-forming Scales (MAPS). XV. Tracing protoplanetary disk structure within 20 au},
author = {Arthur D. Bosman and Edwin A. Bergin and Ryan A. Loomis and Sean M. Andrews and Merel L. R. van 't Hoff and Richard Teague and Karin I. Öberg and Viviana V. Guzmán and Catherine Walsh and Yuri Aikawa and Felipe Alarcón and Jaehan Bae and Jennifer B. Bergner and Alice S. Booth and Gianni Cataldi and L. Ilsedore Cleeves and Ian Czekala and Jane Huang and John D. Ilee and Charles J. Law and Romane Le Gal and Yao Liu and Feng Long and François Ménard and Hideko Nomura and Laura M. Pérez and Chunhua Qi and Kamber R. Schwarz},
journal= {arXiv preprint arXiv:2109.06223},
year = {2021}
}
备注
22 pages, 14 figures, accepted by ApJS. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement. Update with correct references to other MAPS papers