Millimeter continuum image of the circumstellar disk around the young star Haro 6-5B

Aperture synthesis observations of dust continuum emission at 2 mm from the class I object Hare 6-5B, made with the Nobeyama Millimeter Array, are presented. A disklike structure that coincides with the dark lane in the visible and near-infrared images is clearly resolved with a small synthesized beam of 1."33 x 1."21 with its position angle (P.A.) of 134 degrees, The beam-deconvolved size of the disk is 2."33 x 0."97 at P.A. = 138 degrees, and the total flux density is 36.7 +/- 2.6 mJy. The radius and inclination angle of the disk derived from the image are 309 +/- 18 AU and 67 degrees +/- 5 degrees, respectively. By model fitting of the spectral energy distribution of Haro 6-5B with these values, the power-law index of the dust opacity, beta, is derived to be 1.05 +/- 0.04 and the disk mass is calculated to be 0.021 +/- 0.002 M.. No extended emission with 1000 AU scale is detected, suggesting that the envelope around Hare 6-5B has been almost dissipated and that the object is a transient source from the protostar stage to the T Tauri stage.