An Edge-On Circumstellar Disk in the Young Binary System HK Tauri

Details An Edge-On Circumstellar Disk in the Young Binary System HK Tauri An Edge-On Circumstellar Disk in the Young Binary System HK Tauri

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...502l..65s&link_type=abstract

Astrophysical Journal Letters v.502, p.L65

Astronomy and Astrophysics

Astronomy

166

Stars: Binaries: General, Stars: Individual Constellation Name: Hk Tauri, Stars: Circumstellar Matter, Stars: Pre-Main-Sequence

Scientific paper

Hubble Space Telescope (HST) images of HK Tauri reveal that the companion star in this 2."4 (340 AU) pre-main-sequence binary system is an entirely nebulous object at visual wavelengths. HK Tau/c appears as two elongated reflection nebulosities separated by a dark lane. Near-infrared adaptive optics observations made at the Canada-France-Hawaii Telescope show a similar morphology and no directly visible star at lambda <=2.2 mu m. HK Tau/c is strikingly similar to scattered light models of an optically thick circumstellar disk seen close to edge-on and to the HST images of HH 30. HK Tau/c is therefore the first disk to be clearly resolved around an individual star in a young binary system. The disk properties have been constrained by fitting model reflection nebulae to the HST images. The disk has a radius of 105 AU, an inclination of about 5 deg, a scale height of 3.8 AU at r=50 AU, and is flared. The absence of a point source in the near-IR requires AV>50 mag toward the unseen central star. The thickness of the dark lane establishes a disk mass near 10-4 Msolar (~0.1 MJupiter) of dust and gas, if the dust grains have interstellar properties and remain fully mixed vertically. With the observed disk radius equal to one-third of the projected separation of the binary, there is a strong possibility that tidal truncation of the circumsecondary disk has occurred in this system.

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