GIARPS High-resolution Observations of T Tauri stars (GHOsT). II.
  Connecting atomic and molecular winds in protoplanetary disks
  In the framework of the GIARPS High-resolution Observations of T Tauri stars
(GHOsT) project, we aim to characterize the atomic and molecular winds in a
sample of classical T Tauri stars (CTTs) of the Taurus-Auriga region. We
analyzed the flux calibrated [OI] 630 nm and $\rm H_2$ 2.12 $\rm \mu m$ lines
in a sample of 36 CTTs observed at the Telescopio Nazionale Galileo with the
HARPS and GIANO spectrographs. We decomposed the line profiles into different
kinematic Gaussian components and focused on the most frequently detected
component, the narrow low-velocity (v$\rm_p < 20$ $\rm km$ $\rm s^{-1}$)
component (NLVC). We found that the $\rm H_2$ line is detected in 17 sources
($\sim 50 \%$ detection rate), and [OI] is detected in all sources but one. The
NLV components of the $\rm H_2$ and [OI] emission are kinematically linked,
with a strong correlation between the peak velocities and the full widths at
half maximum of the two lines. Assuming Keplerian broadening, we found that the
[OI] NVLC originates from a disk region between 0.05 and 20 au and that of $\rm
H_2$ in a region from 2 and 20 au. We did not find any clear correlation
between v$\rm_p$ of the $\rm H_2$ and [OI] NVLC and the outer disk inclination.
This result is in line with previous studies. Our results suggest that
molecular and neutral atomic emission in disk winds originate from regions that
might overlap, and that the survival of molecular winds in disks strongly
depends on the gas exposure to the radiation from the central star. Our results
demonstrate the potential of wide-band high-resolution spectroscopy in linking
tracers of different manifestations of the same phenomenon.
