High-resolution Near-infrared Polarimetry and Submillimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System

Frantz Martinache (1) , Yi Yang (2) , Eiji Akiyama (3) , Thayne Currie (4) , Ruobing Dong (5) , Jun Hashimoto , Saeko Hayashi , Carol Grady (6) , Markus Janson , Nemanja Jovanovic (7) , Taichi Uyama (8) , Takao Nakagawa , Tomoyuki Kudo (4) , Nobuhiko Kusakabe , Masayuki Kuzuhara (4) , Lyu Abe (9) , Wolfgang Brandner (10) , Timothy Brandt , Michael Bonnefoy , Joseph Carson , Jeffrey Chilcote (11) , Evan Rich , Markus Feldt , Miwa Goto , Tyler Groff , Olivier Guyon , Yutaka Hayano , Masahiko Hayashi , Thomas Henning , Klaus Hodapp , Miki Ishii , Masanori Iye , Ryo Kandori , Jeremy Kasdin , Gillian Knapp , Jungmi Kwon , Julien Lozi , Taro Matsuo , Satoshi Mayama , Michael Mcelwain , Shoken Miyama , Jun-Ichi Morino , Amaya Moro-Martin , Tetsuo Nishimura , Tae-Soo Pyo , Eugene Serabyn , Hiroshi Suto , Ryuji Suzuki , Michihiro Takami , Naruhisa Takato , Hiroshi Terada , Christian Thalmann , Edwin Turner , Makoto Watanabe , John Wisniewski , Toru Yamada , Hideki Takami , Tomonori Usuda , Motohide Tamura

1 LAGRANGE - Joseph Louis LAGRANGE
2 SPL - Signal Processing Laboratory
3 Hokkaido University [Sapporo, Japan]
4 NAOJ - National Astronomical Observatory of Japan
5 ASIAA - Academia Sinica Institute of Astronomy and Astrophysics
6 GSFC - NASA Goddard Space Flight Center
7 CALTECH - California Institute of Technology
8 UTokyo - The University of Tokyo
9 OCA - Observatoire de la Côte d'Azur
10 MPIA - Max-Planck-Institut für Astronomie
11 Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556

Abstract We analyzed the young (2.8 Myr-old) binary system FS Tau A using near-infrared ( H -band) high-contrast polarimetry data from Subaru/HiCIAO and submillimeter CO (J = 2–1) line emission data from Atacama Large Millimeter/submillimeter Array (ALMA). Both the near-infrared and submillimeter observations reveal several clear structures extending to ∼240 au from the stars. Based on these observations at different wavelengths, we report the following discoveries. One arm-like structure detected in the near-infrared band initially extends from the south of the binary with a subsequent turn to the northeast, corresponding to two bar-like structures detected in ALMA observations with an local standard of rest kinematic (LSRK) velocity of 1.19–5.64 km s −1 . Another feature detected in the near-infrared band extends initially from the north of the binary, relating to an arm-like structure detected in ALMA observations with an LSRK velocity of 8.17–16.43 km s −1 . From their shapes and velocities, we suggest that these structures can mostly be explained by two streamers that connect the outer circumbinary disk and the central binary components. These discoveries will be helpful for understanding the evolution of streamers and circumstellar disks in young binary systems.

Domaines: Astrophysique stellaire et solaire [astro-ph.SR]; Astrophysique [astro-ph]

Frantz Martinache, Yi Yang, Eiji Akiyama, Thayne Currie, Ruobing Dong, et al.. High-resolution Near-infrared Polarimetry and Submillimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System. The Astrophysical Journal, 2020, 889 (2), pp.140. ⟨10.3847/1538-4357/ab64f9⟩. ⟨hal-03518334⟩