Systematic Search for Rotation at the Base of Outflows from T Tauri Stars

Details Systematic Search for Rotation at the Base of Outflows from T Tauri Stars Systematic Search for Rotation at the Base of Outflows from T Tauri Stars

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9435b&link_type=abstract

HST Proposal ID #9435

Physics

Hst Proposal Id #9435

Scientific paper

We wish to search for rotation signatures in the initial portion {first 100 AU} of a sample of outflows emanating from T Tauri stars {TTSs}. This project originates from our detection of systematic transverse radial velocity shifts in STIS spectra of the DG Tau jet {Bacciotti et al., 2002}. The shifts, observed in a region where the flow is already collimated, but has not yet manifestly interacted with its environment, are consistent with the predictions of magneto- centrifugal launching models, and may constitute the first observed indication for rotation in the initial portion of a jet flow. Rotation is a fundamental ingredient in star formation theories, thus we propose to confirm the above result by carrying out a systematic survey in similar flows. We plan to take for each jet a STIS spectrum in the 6300 - 6800 Angstrom range, with the slit perpendicular to the flow direction and at a distance of about 0.''3 from the source {i.e., in our targets, 40 - 70 AU along the jet depending on inclination angle}. Since the flows are resolved transversely with HST, the proposed slit orientation allows for the direct detection of systematic velocity shifts. Where found, we will check for consistency between the sense of rotation observed and that of the underlying disk through CO interferometric measurements. As a by-product, estimates of the excitation conditions across the flow {including ionization fraction} and of the mass outflow rates will be derived.

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