Oral Presentation

Disk structure in a large hole of a pre-transitional disk around Sun-like PDS 70 young star

Author(s): Michael Sitko (U of Cincinnati), Ruobing Dong (U of Arizona), Hauyu Baobab Liu (ESO/ASIAA), Carol Grady (Goddard NASA), Yasuhiro Hasegawa (Caltech), Jun Hashimoto (ABC/NAOJ), Takayuki Muto (Kogakuin U), Motohide Tamura (ABC/U of Tokyo)

Presenter: Eiji Akiyama (NAOJ)

It has become evident that protoplanetary disks have complex structures and capable of examining the inner region (a few x 10 AU) of protoplanetary disks. The Subaru telescope revealed that a pre-transitional disk around Sun-like PDS 70 young star had a large hole of approximately 70 AU in radius. Model fits to the SED implies that a small structure was associated with in the hole. Our spatially resolved HCO+(J=4-3) ALMA observations toward PDS 70 have revealed that the detail structure of the inner disk probably connected by 2 or 3 bridges with the outer disk, although the hole was completely empty in the sub-millimeter continuum observations. In addition to no detection of dust in the hole in H-band and submillimeter continuum observations, measurement of a very low accretion rate obtained by H-alpha observation also indicates that the inner disk may be dust-poor and gas-rich. We also discuss kinematic structure of the inner disk and future observation plan.