We present new Atacama Large Millimeter/submillimeter Array ( ALMA ) observations of the tadpole , a small globule in the Carina Nebula that hosts the HH 900 jet+outflow system .
Our data include ^ { 12 } CO , ^ { 13 } CO , C ^ { 18 } O J=2-1 , ^ { 13 } CO , C ^ { 18 } O J=3-2 , and serendipitous detections of DCN J=3-2 and CS J=7-6 .
With angular resolution comparable to the Hubble Space Telescope ( HST ) , our data reveal for the first time the bipolar molecular outflow in CO , seen only inside the globule , that is launched from the previously unseen jet-driving protostar ( the HH 900 YSO ) .
The biconical morphology joins smoothly with the externally irradiated outflow seen in ionized gas tracers outside the globule , tracing the overall morphology of a jet-driven molecular outflow .
Continuum emission at the location of the HH 900 YSO appears to be slightly flattened perpendicular to outflow axis .
Model fits to the continuum have a best-fit spectral index of \sim 2 , suggesting cold dust and the onset of grain growth .
In position-velocity space , ^ { 13 } CO and C ^ { 18 } O gas kinematics trace a C-shaped morphology , similar to infall profiles seen in other sources , although the global dynamical behaviour of the gas remains unclear .
Line profiles of the CO isotopologues display features consistent with externally heated gas .
We estimate a globule mass of \sim 1.9 M _ { \odot } , indicating a remaining lifetime of \sim 4 Myr , assuming a constant photoevaporation rate .
This long globule lifetime will shield the disk from external irradiation perhaps prolonging its life and enabling planet formation in regions where disks are typically rapidly destroyed .