Visit ASIAA Homepage Registration Deadline: November 27, 2019 (Taiwan Time)
East-Asian ALMA Science Workshop 2019
February 19(Wed)-21(Fri), 2020
ASIAA, Taipei, Taiwan

Poster Presentation

ALMA survey of the Orion dense cores: Unveiling the Jet Launching Scenario from Low-mass Protostars

Author(s): Somnath Dutta ; ASIAA Chin-Fei Lee; ASIAA Tie Liu; SAO Naomi Hirano; ASIAA Sheng-Yuan Liu; ASIAA Kee-Tae Kim; KASI Dipen Sahu; ASIAA Kai-Syun Jhan; NTU/ASIAA Shih-Ying Hsu; NTU/ASIAA

Presenter: Somnath Dutta (ASIAA)

Recently a sample of 72 extremely young dense cores in the Orion complex has been studied with the ALMA Band 6. We obtained the 1.3 mm continuum images at an angular resolution of ~ 0.35" (140 au), as well as CO, C18O and SiO line emission images at a resolution of ~ 0.40" (160 au). Our preliminary analyses of the CO images reveal 40% of the observed dense cores have bipolar outflows with outflow opening angle acting as a function of the age of the host protostars. Rest sources include starless cores, compact emission with no outflow, and unresolved compact emission. Around 58% of the outflow sources are showing collimated jets in their SiO and CO emission. Using the continuum and C18O line emission, the outflow sources have been found to consist of a compact envelope ranging from 150 to 1200 au in the mass spectrum 0.035-0.60 M_sun. The preliminary results suggest that the observed jets are mostly launched at early-to-mid Class 0 evolutionary stages depending upon the compactness of the low-mass protostellar envelope.

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