Kinematics around the B335 protostar down to au scales
Per Bjerkeli (1), Jon P. Ramsey (2,4), Daniel Harsono (3), Hannah, Calcutt (1), Lars E. Kristensen (4), Matthijs H. D. van der Wiel (5), Jes K., J{\o}rgensen (4), S\'ebastien Muller (1), and Magnus V. Persson (1) ((1), Department of Space, Earth, and Environment

TL;DR
This study uses ALMA observations to analyze the small-scale kinematics and morphology of the outflow from the B335 protostar, revealing detailed structures and dynamics down to a few au, and providing insights into outflow launching and disk formation.
Contribution
It presents the first high-resolution ALMA observations of B335's outflow and inner regions, revealing detailed kinematic and morphological properties at scales down to a few au.
Findings
$^{12}$CO shows an X-shaped outflow cavity morphology.
Methanol and SO$_2$ are detected within 30 au, indicating rotation.
Outflow launching radius is estimated to be less than 0.1 au.
Abstract
Context. The relationship between outflow launching and formation of accretion disks around young stellar objects is still not entirely understood, which is why spectrally and spatially resolved observations are needed. Recently, the Atacama Large Millimetre/sub-millimetre Array (ALMA) has carried out long-baseline observations towards a handful of sources, revealing connections between outflows and the inner regions of disks. Aims. Here we aim to determine the small-scale kinematic and morphological properties of the outflow from the isolated protostar B335 for which no Keplerian disk has, so far, been observed on scales down to 10 au. Methods. We use ALMA in its longest-baseline configuration to observe emission from CO isotopologs, SiO, SO and CHOH. The proximity of B335 provides a resolution of ~3 au (0.03''). We also combine our long-baseline data with archival data to…
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