  Near-IR atomic and molecular transitions are powerful tools to trace the warm
and hot gas in the circumstellar environment of young stars. Ro-vibrational
transitions of H2 and H2O, and overtone transitions of CO at 2 micron centered
at the stellar velocity trace hot (T~1500 K) gas in the inner few AU of
protoplanetary disks. H2 near-IR lines displaying a blueshift of a few km/s
probe molecular disk winds. H2 lines presenting blueshifts of hundreds of km/s
reveal hot shocked gas in jets. Atomic lines such as the HeI line at 10830 A
and the Hydrogen Paschen beta and Brakett gamma lines trace emission from
accretion funnel flows and atomic disk winds. Bright forbidden atomic lines in
the near-IR of species such as [Fe II], [N I], [S I], [S II], and [C I] trace
atomic and ionized material in jets. The new near-IR high resolution
spectrograph SPIROU planned for the Canada France Hawaii Telescope will offer
the unique capability of combining high-spectral resolution (R~75000) with a
large wavelength coverage (0.98 to 2.35 micron) in one single exposure. This
will provide us with the means of probing accretion funnel flows, winds, jets,
and hot gas in the inner disk simultaneously. This opens the exiting
possibility of investigating their combined behavior in time by the means of
monitoring observations and systematic surveys. SPIROU will be a powerful tool
to progress our understanding of the connexion between the accretion/ejection
process, disk evolution, and planet formation.
