期刊
ASTRONOMY & ASTROPHYSICS
卷 555, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201321129
关键词
stars: pre-main sequence; ISM: jets and outflows; ISM: kinematics and dynamics; stars: individual: HD 163296
资金
- Spanish MICINN [AYA2011-30228-C03]
- FEDER
- Millennium Science Initiative, Chilean Ministry of Economy: Nucleus [P10-022-F]
- NOVA
- KNAW
- EU A-ERC [291141]
- NWO Physical Sciences (The Netherlands Organization for Scientific Research (NWO), Physical Sciences)
Disk winds have been postulated as a mechanism for angular momentum release in protostellar systems for decades. HD 163296 is a Herbig Ae star surrounded by a disk and has been shown to host a series of HH knots (HH 409) with bow shocks associated with the farthest knots. Here we present ALMA science verification data of CO J = 2-1 and J = 3-2 emission, which are spatially coincident with the blue shifted jet of HH knots, and offset from the disk by -18.6 km s(-1). The emission has a double corkscrew morphology and extends more than 10 '' from the disk with embedded emission clumps coincident with jet knots. We interpret this double corkscrew as emission from material in a molecular disk wind, and that the compact emission near the jet knots is being heated by the jet that is moving at much higher velocities. We show that the J = 3-2 emission is likely heavily filtered by the interferometer, but the J = 2-1 emission suffers less due to the larger beam and sensitivity to larger scale structures. Excitation analysis suggests temperatures exceeding 900 K in these compact features, with the wind mass, momentum and energy being of order 10(-5) M-circle dot, 10(-4) M-circle dot km s(-1) and 10(40) erg, respectively. The high mass loss rate suggests that this star is dispersing the disk faster than it is funneling mass onto the star.
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