1. SMA Observations of HH 212 Chin-Fei Lee Collaborators: (CFA) Paul Ho, Qizhou Zhang, Tyler Bourke, Henrik Beuther (ASIAA) Naomi Hirano, Sheng-Yuan Liu, Sienny Shang

2. Previous Observations

3. 1.33mm Continuum Observation ● Flux density ~ 0.11 Jy ● Slight elongated ● Dust opacity  ~ 1 ● T (dust) ~ 50 K  M ~ 0.08 Msun ● Cold, low-mass Class 0 source

4. C 18 O J=2-1 Observation ● Disk embedded in NH 3 Env. ● Shell opening to the North? ● Differential Rotation ● V ~ 0.5 √ (200AU/r) km/s ● Central mass ~ 0.07 Msun ● Disk mass ~ 0.02 Msun

5. 13 CO J=2-1 Observation ● Unresolved narrow waist ● Inner part of the rotating disk? ● Redshifted dip. Infall? ● Shells at the base of the nebulae?

6. 1.33 mm + C 18 O + 13 CO + H 2

7. 12 CO J=2-1(Contours) + H 2 (Image)

8. CO Outflow Kinematics A Jet-driven ballistic bow shock model

9. SO J=6-5 Observation ● Shock emission at 70-180 K ● Elongated along the jet axis ● Knotty shocks near the source? ● SK4: Rotation or sideways expansion?

10. SO + 12 CO + H 2

11. Conclusions ● 1.33 mm: cold, low-mass Class 0 source. ● C 18 O: an edge-on, differentially rotating disk around the source. Angular momentum seems carried inward into the disk from the NH 3 envelope. ● 13 CO: inner part of the disk and shells at the base of the nebulae? ● 12 CO: shell structures around the H 2 jet. H 2 bow shocks and CO outflow kinematics are roughly consistent with a jet-driven ballistic bow shock model. ● SO: knotty shocks near the source? SK4 -- rotating or expanding?