GW Ori is a hierarchical triple system which has a rare circumtriple disk. We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 1.3 mm dust continuum and 12CO J=2-1 molecular gas emission of the disk. For the first time, we identify three dust rings in the disk at ~46, 188, and 338 AU, with estimated dust mass of ~70-250 Earth masses, respectively. To our knowledge, the outer ring in GW Ori is the largest dust ring ever found in protoplanetary disks. We use visibility modelling of dust continuum to show that the disk has misaligned parts and the innermost dust ring is eccentric. The disk misalignment is also suggested by the CO kinematics modelling. We interpret these substructures as evidence of ongoing dynamical interactions between the triple stars and the circumtriple disk.
@article{arxiv.2004.03135,
title = {GW Ori: Interactions Between a Triple-star System and its Circumtriple Disk in Action},
author = {Jiaqing Bi and Nienke van der Marel and Ruobing Dong and Takayuki Muto and Rebecca G. Martin and Jeremy L. Smallwood and Jun Hashimoto and Hauyu Baobab Liu and Hideko Nomura and Yasuhiro Hasegawa and Michihiro Takami and Mihoko Konishi and Munetake Momose and Kazuhiro D. Kanagawa and Akimasa Kataoka and Tomohiro Ono and Michael L. Sitko and Sanemichi Z. Takahashi and Kengo Tomida and Takashi Tsukagoshi},
journal= {arXiv preprint arXiv:2004.03135},
year = {2020}
}
Comments
17 pages, 3+3 figures, 2 tables; accepted by ApJL on 2020-04-29