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1. Rapid Evolution of Type II Spicules Observed in Goode Solar Telescope On-disk H α Images

   https://doi.org/10.3847/2041-8213/ab7931  

   Yurchyshyn, Vasyl ; Cao, Wenda ; Abramenko, Valentina ; Yang, Xu ; Cho, Kyung-Suk ( March 2020 , The Astrophysical Journal)

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2. LHS 1815b: The First Thick-disk Planet Detected by TESS

   https://doi.org/10.3847/1538-3881/ab775a  

   Gan, Tianjun ; Shporer, Avi ; Livingston, John H. ; Collins, Karen A. ; Mao, Shude ; Trani, Alessandro A. ; Gandolfi, Davide ; Hirano, Teruyuki ; Luque, Rafael ; Stassun, Keivan G. ; et al ( April 2020 , The Astronomical Journal)

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3. The First Swift Intensive AGN Accretion Disk Reverberation Mapping Survey

   https://doi.org/10.3847/1538-4357/aaf3b4  

   Edelson, R. ; Gelbord, J. ; Cackett, E. ; Peterson, B. M. ; Horne, K. ; Barth, A. J. ; Starkey, D. A. ; Bentz, M. ; Brandt, W. N. ; Goad, M. ; et al ( January 2019 , The Astrophysical Journal)
4. PRODIGE – envelope to disk with NOEMA: I. A 3000 au streamer feeding a Class I protostar

   https://doi.org/10.1051/0004-6361/202243310  

   Valdivia-Mena, M. T. ; Pineda, J. E. ; Segura-Cox, D. M. ; Caselli, P. ; Neri, R. ; López-Sepulcre, A. ; Cunningham, N. ; Bouscasse, L. ; Semenov, D. ; Henning, Th. ; et al ( November 2022 , Astronomy & Astrophysics)

   Context. In the past few years, there has been a rise in the detection of streamers, asymmetric flows of material directed toward the protostellar disk with material from outside a star’s natal core. It is unclear how they affect the process of mass accretion, in particular beyond the Class 0 phase. Aims. We investigate the gas kinematics around Per-emb-50, a Class I source in the crowded star-forming region NGC 1333. Our goal is to study how the mass infall proceeds from envelope to disk scales in this source. Methods. We use new NOEMA 1.3 mm observations, including C 18 O, H 2 CO, and SO, in the context of the PRODIGE MPG – IRAM program, to probe the core and envelope structures toward Per-emb-50. Results. We discover a streamer delivering material toward Per-emb-50 in H 2 CO and C 18 O emission. The streamer’s emission can be well described by the analytic solutions for an infalling parcel of gas along a streamline with conserved angular momentum, both in the image plane and along the line-of-sight velocities. The streamer has a mean infall rate of 1.3 × 10 −6 M ⊙ yr− 1 , five to ten times higher than the current accretion rate of the protostar. SO and SO 2 emission reveal asymmetric infall motions in the inner envelope, additional to the streamer around Per-emb-50. Furthermore, the presence of SO 2 could mark the impact zone of the infalling material. Conclusions. The streamer delivers sufficient mass to sustain the protostellar accretion rate and might produce an accretion burst, which would explain the protostar’s high luminosity with respect to other Class I sources. Our results highlight the importance of late infall for protostellar evolution: streamers might provide a significant amount of mass for stellar accretion after the Class 0 phase. 

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5. Dark Molecular Gas in Simulations of z ∼ 0 Disk Galaxies

   https://doi.org/10.3847/1538-4357/aaec77  

   Li, Qi ; Narayanan, Desika ; Davè, Romeel ; Krumholz, Mark R. ( December 2018 , The Astrophysical Journal)