PI: Tracy L Beck, STScI, firstname.lastname@example.org
Address: 3700 DRIVE, BALTIMORE, MD 21218 USA
CoI: Catherine Dougados, CNRS UMI FCA
Title: Understanding protostellar jet launching in Herbig Stars
Abstract: The origin of protostellar jets, their role in angular momentum extraction, and their impact on protoplanetary disk evolution are still fundamental open questions in star formation. Based on analysis of current models for jet launching, if stellar magnetospheres play an important role in driving the high-velocity part of the flow, one might expect that jet properties will differ between fully convective T Tauri stars and more massive stars, which lack a convection zone. We propose to conduct a deep spatio-kinematical mapping of the inner jet from the Herbig star HD163296 in the [FeII] 1.644, and 1.533 micron lines. The only available instrument in the world to carry out this investigation is Gemini + NIFS with its unique occulting disk option. HD 163296 is a well-studied, close-by (d=122pc) young A2Ve star that provides an important cornerstone for jet investigations in Herbig stars. It has one of the best studied protoplanetary accretion disks and is known to drive a large scale jet. No strong magnetic field is detected on the central star, in contrast to measurements of jet-driving T Tauri stars. We plan to use NIFS to derive the inner jet collimation properties (jet width, opening angle), identify kinematical components and determine their excitation parameters and mass flux. We will search for rotation signatures as transverse velocity gradients across the jet. These results will bring critical new constraints to protostellar jet launching mechanisms in Herbig stars.
Program Type: Standard/Galactic
Run 1 (2016A): GEM-NQ/NIFS -- 2.5hrs band 1 (GN-2016A-Q-38)
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360