Using the partially completed Submillimeter Array with five antennas, we have observed the CO J=2-1 and 3-2 emission from the envelope surrounding the carbon star V Hya. The high-angular resolution (2"-4") maps show that V Hya is powering a bipolar molecular jet having an extreme velocity of 70-185 km/s. The axis of this high velocity jet is perpendicular to the major axis of the flattened disk-like envelope, which is expanding with a velocity of ~16 km/s.There is a third kinematic component, a medium-velocity wind having a deprojected velocity of 40-120 km/s moving along the disk plane. Both the high velocity jet and the medium velocity wind have a dynamical time scale of a few hundred years. The flattened structure and the collimated jet observed in V Hya suggests that the formation of asymmetrical structure proceeds while the central star is still in the AGB phase
@article{arxiv.astro-ph/0407337,
title = {High velocity bipolar outflow and disk-like envelope in the carbon star V Hya},
author = {Naomi Hirano and Hiroko Shinnaga and Dinh-V-Trung and David Fong and Eric Keto and Nimesh Patel and Chunhua Qi and Ken Young and Qizhou Zhang and Junhui Zhao},
journal= {arXiv preprint arXiv:astro-ph/0407337},
year = {2009}
}