Since the first discovery of an exoplanet around normal stars in 1995, more than 300 giant planets have been detected for a last decade. These discoveries of substantial planets with the indirect methods have revealed a wide variety of plan etary systems which are much different from our Solar system. How and when has this diversity began? Planetary systems are byproducts of star formation occurred in protoplanetary disks around pre-main-sequence stars. It is crucial to investigate whether the variety comes from different initial conditions of circumstellar structures. Studying various circumstellar environments around young stellar objects is there fore necessary to account for the origin of the observed diversity of mature planetary systems. Investigating circumstellar environments also holds a key to solve the prob lem of the formation of our own Solar System and other planetary systems. From this point of view, we conducted a systematic imaging survey of circumstellar disks around YSOs utilizing Subaru Telescope. In this paper, we present high resolution images of low-mass YSO, RN091, which are one of the results from our survey.
ISM reflection nebula stars individuaI(RN091) stars pre-main se-quence
Optical and Infrared Astronomy Division, National Astronomical Observatory of Japan, 2-2/-1 Osawa, M Optical and Infrared Astronomy Division, National Astronomical Observatory of Japan, 2-2/-1 Osawa, M SUBARU Telescope, National Astrortomical Observatory of Japan, 650 North A ohoku Place, Hilo, HI967 Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501 Division of Particle and Astrophysical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464