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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 198614.0, MPI für Astronomie / Publikationen_mpia
Hubble Space Telescope WFPC2 imaging of the disk and jet of HV Tauri C
Authors:Stapelfeldt, K.R.; Ménard, F.; Watson, A.M.; Krist, J.E.; Dougados, C.; Padgett, D.L.; Brandner, W.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Start Page:410
End Page:418
Sequence Number of Article:2003ApJ...589..410S
Review Status:not specified
Audience:Experts Only
Abstract / Description:We have obtained Hubble Space Telescope (HST) WFPC2 images of the HV Tauri young triple system. The tertiary star appears as a compact bipolar nebula at visual wavelengths as already known in the near-infrared. New, deeper adaptive optics observations made at the Canada-France-Hawaii Telescope show no point source in the nebula to a limiting magnitude of K>15. The results therefore confirm that HV Tau C is an optically thick circumstellar disk seen close to edge-on. Clear evidence for small, chromatic dust particles in the outer disk is provided by the color structure of the nebula: the thickness of the central dust lane shrinks by 30% between 0.55 and 2.2 μm. Bipolar jets extending 0.3"-0.7" perpendicular to the dust lane are seen in HST narrowband [S II] and [O I] images. The continuum images are compared to multiple scattering models, with optimal density model parameters derived through χ2 minimization. A disk density distribution provides a reasonable fit to the K-band image but is unable to reproduce the vertical extent of the nebula at I band without resorting to an unreasonably large scale height. Adding an envelope structure around the disk results in a much better fit to the HST image, and with a physically reasonable disk scale height. Our preferred model has a disk outer radius of 50 AU, inclination of 6°, and scale height of 6.5 AU at r=50 AU. The thickness of the dark lane establishes a disk mass near 2×10-3Msolar (~2MJup) of dust and gas, if the dust grains have interstellar properties and remain fully mixed vertically. The envelope, with a much smaller mass ~4×10-5Msolar, would be very short-lived unless replenished by new material from the star or surrounding medium.

Using the NASA/ESA Hubble Space Telescope.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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