Imaging the HL Tau Disk at lambda =2.7 MM with the BIMA Array

Details Imaging the HL Tau Disk at lambda =2.7 MM with the BIMA Array Imaging the HL Tau Disk at lambda =2.7 MM with the BIMA Array

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18711303m&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #113.03; Bulletin of the American Astronomical Society, Vol. 27, p.1446

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained a sub-arc-second image of the disk associated with the TTauri star HL Tau at a wavelength of 2.7mm using the new high resolution capability of the BIMA array. The disk is elongated with a deconvolved Gaussian source size of 1.0+/-0.2'' x 0.5+/-0.2\arcsec, implying semimajor and semiminor axes of 70+/-15 AU and 35+/-15 AU, respectively, for a distance of 140 pc. The position angle of the major axis (125°+/-10°) is orthogonal to the axis of the optical jet, and the aspect ratio of the axes suggests an inclination angle between 25°\ and 75°\ for a thin disk. The disk centroid is coincident with the VLA lambda =3.6cm source position and nearly coincident with recent measurements of the near-infrared emission peak. The lambda =2.7mm images, along with previous interferometric measurements at lambda =0.87mm and flux measurements from 10 microns to 1.3cm, are well fitted by a simple power-law disk model with a shallow radial dependence to the surface density (Sigma (r) ~ r(0) to r(-1) ), an outer radius between 90 and 160 AU, and a dust opacity law proportional to nu (1) .

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