Abstract
Studying young Keplerian disks may reveal important clues regarding the formation of disks, such as what factors can enhance the formation of the disk, what is the extent of the disk and what are the kinematics of the gas at the transition from infall to rotation. We have discovered an extremely young Keplarian disk around the Class 0 protostar VLA1623A based on our SMA and ALMA Cycle 0 data (Murillo & Lai 2013, Murillo et al. 2013). Here we present our new ALMA Cycle 2 data in Band 6 (C18O (2-1), DCO+ (3-2) and 13CO (2-1)), Band 7 (N2H+ (4-3), DCO+ (5-4) and H2D+ (1$_{1,0}$-1$_{1,1}$)), and Band 8 (C18O (4-3) and continuum), which have been delivered to us partially to date. We will be able to use these data to study the kinematic and temperature structure of the young Keplarian disk. The C18O and 13CO lines will trace the kinematics of the disk. The factor 2 increase in spatial resolution and sensitivity in C18O (2-1) will tell us what the velocity structure is of the disk and its connection with infall. Comparison of the same molecule in (4 3) (Eu=55 K vs 16 K) will allow us to further constrain the temperature structure of the young disk. The two DCO+ transitions, N2H+ and H2D+ will serve as ‘thermometers’, and the different resolutions will trace the large and small scales.