A protostellar system fed by a streamer of 10,500 au length
Jaime E. Pineda, Dominique Segura-Cox, Paola Caselli, Nichol Cunningham, Bo Zhao, Anika Schmiedeke, Maria José Maureira, Roberto Neri
备注：
Published in Nature Astronomy on July 27th 2020. This is the authors' version before final edits, including methods section. Link to the NatAstro publication: https://www.nature.com/articles/s41550-020-1150-z
Binary formation is an important aspect of star formation. One possible route for close-in binary formation is disk fragmentation$^{[1,2,3]}$. Recent observations show small scale asymmetries (<300 au) around young protostars$^{[2,4]}$, although not always resolving the circumbinary disk, are linked to disk phenomena$^{[5,6]}$. In later stages, resolved circumbinary disk observations$^{[7]}$ (<200 au) show similar asymmetries, suggesting the origin of the asymmetries arises from binary-disk interactions$^{[8,9,10]}$. We observed one of the youngest systems to study the connection between disk and dense core. We find for the first time a bright and clear streamer in chemically fresh material (Carbon-chain species) that originates from outside the dense core (>10,500 au). This material connects the outer dense core with the region where asymmetries arise near disk scales. This new structure type, 10x larger than those seen near disk scales, suggests a different interpretation of previous observations: large-scale accretion flows funnel material down to disk scales. These results reveal the under-appreciated importance of the local environment on the formation and evolution of disks in early systems$^{[13,14]}$ and a possible initial condition for the formation of annular features in young disks$^{[15,16]}$.
ANTIHEROES-PRODIGE: Quantifying the connection from envelope to disk with the IRAM 30m telescope and NOEMA I. Attack of the streamers: L1448N's fight for order in the chaos
Magneto-Gravitational Regulated Streamer Accretion onto a Class 0 Protostellar System
Institut de Ciències de l'Espai (ICE-CSIC)（太空科学研究所）；Korea Astronomy and Space Science Institute（韩国天文学与空间科学研究院）；Institut d'Estudis Espacials de Catalunya (IEEC)（加泰罗尼亚空间研究学院）；Worcester State University（伍斯特州立大学）；University of Toledo（托莱多大学）；Universidad Nacional Autónoma de México（墨西哥国立自治大学）；National Radio Astronomy Observatory（美国国家射电天文台）；Joint ALMA Observatory（ALMA联合天文台）；Instituto Argentino de Radioastronomía（阿根廷射电天文研究所）；Universidad Nacional de La Plata（拉普拉塔国立大学）；University of Virginia（弗吉尼亚大学）；University of Illinois（伊利诺伊大学）；Academia Sinica Institute of Astronomy and Astrophysics（中央研究院天文及天文物理研究所）；Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理研究所）；The University of Tokyo（东京大学）；Queen’s University（女王大学）；Center for Astrophysics | Harvard & Smithsonian（哈佛史密森尼天体物理中心）；AES Indiana（AES印第安纳）；National Astronomical Observatory of Japan（日本国立天文台）；Space Science Institute（空间科学研究所）；Guangxi University（广西大学）
Characterizing the physical and chemical properties of the Class I protostellar system Oph-IRS 44. Binarity, infalling streamers, and accretion shocks
European Southern Observatory（欧洲南方天文台）；Pontificia Universidad Católica de Chile（智利天主教 Pontificia 大学）；Leiden University（莱顿大学）；University of Michigan（密歇根大学）；National Tsing Hua University（国立清华大学）；RIKEN Cluster for Pioneering Research（理化学研究所前沿研究集群）；University of Copenhagen（哥本哈根大学）
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 environmental imprint on molecular layering in the dusty streamer of M512
ESO（欧洲南方天文台）；INAF, Osservatorio Astrofisico di Arcetri（意大利国家天体物理研究所，阿切特里天文台）；SUPA, School of Physics & Astronomy, University of St Andrews（圣安德鲁斯大学物理与天文学学院）；Department of Astronomy, University of Virginia（弗吉尼亚大学天文学系）；Department of Astronomy, University of Florida（佛罗里达大学天文学系）；Earth and Planets Laboratory, Carnegie Institution for Science（卡内基科学机构地球与行星实验室）；Department of Astronomy, Boston University（波士顿大学天文学系）
A tale of three tails: A misaligned streamer and mysterious structures around [BHB2007]1
University of Virginia（弗吉尼亚大学）；Diego Portales University（迭戈波塔莱斯大学）；Univ. Grenoble Alpes, CNRS, IPAG（格勒诺布尔阿尔卑斯大学，法国国家科学研究中心，天文与行星研究所）；University of Nevada（内华达大学）
Protostellar disks in their natural habitat -- the formation of protostars and their accretion disks in the turbulent and magnetized interstellar medium
Fragmentation of Dense Rotation-Dominated Structures Fed by Collapsing Gravomagneto-Sheetlets and Origin of Misaligned 100 au-Scale Binaries and Multiple Systems
Series of core collapse numerical simulations (SOLANUM) I: Modelling the early and late infall in a sun-like protostar
Centro de Astrobiología (CAB), CSIC-INTA（天体生物学中心）；Université Lyon 1, ENS de Lyon, CNRS, CRAL（里昂第一大学）；Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM（巴黎萨克雷大学）；Observatorio Astronómico Nacional (OAN, IGN)（国家天文台）；Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）
