Spiral Arms and a Massive Dust Disk with non-Keplerian Kinematics: Possible Evidence for Gravitational Instability in the Disk of Elias 2-27
T. Paneque-Carreño, L. M. Perez, M. Benisty, C. Hall, B. Veronesi, G. Lodato, A. Sierra, J. M. Carpenter, S. M. Andrews, Jaehan Bae, Th. Henning, W. Kwon, H. Li… 展开作者
T. Paneque-Carreño, L. M. Perez, M. Benisty, C. Hall, B. Veronesi, G. Lodato, A. Sierra, J. M. Carpenter, S. M. Andrews, Jaehan Bae, Th. Henning, W. Kwon, H. Linz, L. Loinard, C. Pinte, L. Ricci, M. Tazzari, L. Testi, D. Wilner
备注：
Accepted for publication in ApJ, 38 pages, 23 Figures
To determine the origin of the spiral structure observed in the dust continuum emission of Elias 2-27 we analyze multi-wavelength continuum ALMA data with a resolution of $\sim$0.2 arcsec ($\sim$23au) at 0.89, 1.3 and 3.3mm. We also study the kinematics of the disk with $^{13}$CO and C$^{18}$O ALMA observations in the $J=$3-2 transition. The spiral arm morphology is recovered at all wavelengths in the dust continuum observations, where we measure contrast and spectral index variations along the spiral arms and detect subtle dust-trapping signatures. We determine that the emission from the midplane is cold and interpret the optical depth results as signatures of a higher disk mass than previous constraints. From the gas data, we search for deviations from Keplerian motion and trace the morphology of the emitting surfaces and the velocity profiles. We find an azimuthally varying emission layer height in the system, large-scale emission surrounding the disk, and strong perturbations in the channel maps, co-located with the spirals. Additionally, we develop multigrain dust and gas SPH simulations of a gravitationally unstable disk and compare them to the observations. Given the large scale emission and highly perturbed gas structure, together with the comparison of continuum observations to theoretical predictions, we propose infall-triggered gravitational instabilities as origin for the observed spiral structure.
The Disk Substructures at High Angular Resolution Project (DSHARP): III. Spiral Structures in the Millimeter Continuum of the Elias 27, IM Lup, and WaOph 6 Disks
Kinematic evidence for an embedded planet in the IM Lupi disc
我们测试的假设，一个嵌入式的巨行星在IM卢皮原恒星盘可以产生速度扭结在CO线观测，以及在散射光和连续辐射看到的螺旋臂。我们将行星注入到IM Lupi的三维流体动力学模拟中，使用Monte Carlo辐射转移生成合成观测。我们发现，嵌入式行星的2-3倍的木星质量可以重现非开普勒速度扰动，或“扭结”，在12 CO J=2-1通道地图。这样的行星也可以解释在1.25毫米尘埃连续辐射和1.6微米散射光图像中看到的螺旋臂。我们发现，可以跟踪观察到的峰值速度图，这似乎密切遵循我们的模拟和行星盘相互作用的分析模型预期的形态的行星的尾流。
Early Planet Formation in Embedded Disks (eDisk) XVII: A Compact but Structured Keplerian Disk and Large-scale Streamers Revealed in the Class I Protostellar System IRAS 04169+2702
针对 Class I 原恒星 IRAS 04169+2702 的高分辨率观测揭示了半径约 21 天文单位的开普勒盘、毫米/厘米级尘埃颗粒，以及延伸至 1400 天文单位的吸积流丝，并发现与螺旋臂吸积相关的激波证据。
The Circumbinary Disk of HD 34700A: I. CO gas kinematics indicate spirals, infall, and vortex motions
Université Côte d’Azur, Observatoire de la Côte d’Azur（蔚蓝海岸大学，蔚蓝海岸天文台）；European Southern Observatory（欧洲南方天文台）；Max-Planck Institute for Astronomy (MPIA)（马克斯·普朗克天文学研究所）；University of Florida（佛罗里达大学）；University of Victoria（维多利亚大学）；Massachusetts Institute of Technology（麻省理工学院）；Queen Mary University of London（伦敦大学玛丽女王学院）；Universitá degli Studi di Milano（米兰大学）；Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理研究所）
A multiwavelength ALMA view of gas and dust in binary protoplanetary system AS 205: Evidence of dust asymmetric distribution
Vietnam National Space Center, Vietnam Academy of Science and Technology（越南国家太空中心，越南科学技术院）；SAGI Group, Institute For Interdisciplinary Research in Science and Education（SAGI集团，科学与教育跨学科研究所）；Department of Physics, University of Rome “Tor Vergata”（罗马托维加塔大学物理系）；Department of Astronomy, Faculty of Mathematics, University of Belgrade（贝尔格莱德大学数学学院天文学系）；Laboratoire Lagrange, Université Côte d’Azur（拉格朗日实验室，蔚蓝海岸大学）
Resolved Structure and Orbital Motion of a Localized 1 au-scale Dust Accumulation in the Protoplanetary Disk around TW Hya
Faculty of Engineering, Ashikaga University（足利大学工学部）；Division of Liberal Arts, Kogakuin University（工学园大学教养学部）；Division of Science, National Astronomical Observatory of Japan（日本国立天文台理学科）；Department of Earth and Planetary Sciences, Institute of Science Tokyo（东京科学大学地球行星科学系）；Earth-Life Science Institute, Institute of Science Tokyo（东京科学大学地球生命研究所）；Academia Sinica Institute of Astronomy & Astrophysics (ASIAA)（中央研究院天文及天文物理研究所）；Astrobiology Center, National Institutes of Natural Sciences（自然科学研究机构天体生物学中心）
