Episodic infall towards a compact disk in B335?
Per Bjerkeli, Jon P. Ramsey, Daniel Harsono, Adele Plunkett, Zhi-Yun, Li, Matthijs H. D., van der Wiel, Hannah Calcutt, Jes K. J{\o}rgensen, and, Lars E. Kristensen

TL;DR
This study uses high-resolution ALMA data to investigate gas infall and potential disk formation in B335, revealing signs of an emerging disk and asymmetric infall velocities exceeding free-fall speeds, challenging magnetic braking models.
Contribution
It provides the first high-resolution imaging evidence of an elliptical dust structure and asymmetric infall in B335, suggesting early disk formation and complex kinematics.
Findings
Elliptical dust structure (~10x7 au) indicating a forming disk.
Asymmetric infall predominantly from north and south.
Infall velocities exceeding free-fall speeds near the protostar.
Abstract
Previous observations of B335 have presented evidence of ongoing infall in various molecular lines, e.g., HCO, HCN, CO. There have been no confirmed observations of a rotationally supported disk on scales greater than ~12~au. The presence of an outflow in B335 suggests that also a disk should be present or in formation. To constrain the earliest stages of protostellar evolution and disk formation, we aim to map the region where gas falls inwards and observationally constrain its kinematics. Furthermore, we aim to put strong limits on the size and orientation of any disk-like structure in B335. We use high angular resolution CO data from ALMA, and combine it with shorter-baseline archival data to produce a high-fidelity image of the infall in B335. We also revisit the imaging of high-angular resolution Band 6 continuum data to study the dust distribution in the immediate…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Astro and Planetary Science · Phase Equilibria and Thermodynamics
