VLA and NOEMA view of the Bok Globule CB 17: the starless nature of a
  proposed FHSC candidate
  We use 3mm continuum NOEMA and NH$_3$ VLA observations towards the First
Hydrostatic Core (FHSC) candidate CB 17 MMS to reveal the dust structure and
gas properties down to 600-1,100 au scales and constrain its evolutionary
stage. We do not detect any compact source at the previously identified 1.3 mm
point source, despite expecting a minimum signal-to-noise of 9. The gas traced
by NH$_3$ exhibits subsonic motions, with an average temperature of 10.4 K. A
fit of the radial column density profile derived from the ammonia emission
finds a flat inner region of radius $\sim$1,800 au and a central density of
$\sim$6$\times10^5$ cm$^{-3}$. Virial and density structure analysis reveals
the core is marginally bound ($\alpha_{vir}$= 0.73). The region is entirely
consistent with a young starless core, hence ruling out CB 17 MMS as a FHSC
candidate. Additionally, the core exhibits a velocity gradient aligned with the
major axis, showing an arc-like structure in the p-v diagram and an off-center
region with high-velocity dispersion caused by two distinct velocity peaks.
These features could be due to interaction with the nearby outflow, which
appears to deflect due to the dense gas near the NH$_3$ column density peak. We
investigate the specific angular momentum profile of the starless core, finding
that it aligns closely with previous studies of such radial profiles in Class 0
sources. This similarity to more evolved objects suggests that motions at 1,000
au scales are determined by large-scale dense cloud motions and may be
preserved through the early stages of star formation.
