Edge-on T Tauri stars

Abstract

Using the UVES echelle spectrograph at the ESO VLT we obtained two-dimensional high-resolution (R = 50 000) spectra of the edge-on disk objects HH30*, HK Tau B, and HV Tau C. For comparison purposes we also observed with the same equipment both the classical T Tauri star HL Tau and the active late-type star LDN 1551-9. The spectra of all three observed edge-on disks consist of a T Tauri emission and absorption line spectrum with superimposed jet emission lines. Analysis of the spectra confirmed that the disks are completely opaque at visible wavelengths and that light from the central objects reaches us only via scattering layers above and below the disk planes. The central objects of our targets were found to be normal T Tauri stars showing moderate but different amounts of veiling of their photospheric spectra, indicating different accretion rates or evolutionary stages. We suggest that all classical T Tauri stars (CTTSs) show this observed morphology when viewed edge-on. Part of the jet emission from edge-on systems is directly visible to us in the forbidden lines as well as in Halpha and He I, a finding which contradicts the present paradigm of a pure magnetospheric accretion origin for the formation of hydrogen and helium emission lines in moderately active CTTSs. From a comparison with those Taurus-Auriga CTTSs for which the inclination is reliably known, we conclude that the view angle of CTTS systems is one of the key parameters governing apparent Halpha emission strength in the T Tauri class. We discuss the various possible formation regions for the Na I D lines and show that profiles similar to observed ones can be formed at the base of the disk wind.

16 pages, 15 figures, accepted by A&A

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• T Tauri Jet Physics Resolved Near The Launching Region with the Hubble Space Telescope
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• Modeling the Halpha line emission around classical T Tauri stars using magnetospheric accretion and disk wind models
• Panchromatic observations and modeling of the HV Tau C edge-on disk
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• The circumstellar disk of HH 30. Searching for signs of disk evolution with multi-wavelength modeling
• Microwave Observations of Edge-on Protoplanetary Disks: Program Overview and First Results
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• Mass loss at the lowest stellar masses
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• A High-Resolution Multiband Survey of Westerlund 2 With the Hubble Space Telescope. II. Mass accretion in the Pre-Main Sequence Population
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• Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems
• Discovery of "isolated" comoving T Tauri stars in Cepheus
• Disk Dissipation Timescale of Pre-main Sequence Stars in Taurus
• Gas Absorption in the KH 15D System: Further Evidence for Dust Settling in the Circumbinary Disk
• Gemini Observations of Disks and Jets in Young Stellar Objects and in Active Galaxies
• Two epoch spectro-imagery of FS Tau B outflow system