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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 9 Tomoyuki Kudo 4 Nobuhiko Kusakabe Masayuki Kuzuhara 4 Lyu Abe 10 Wolfgang Brandner 11 Timothy Brandt Michael Bonnefoy Joseph Carson Jeffrey Chilcote 12 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
Abstract : 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.
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Submitted on : Wednesday, January 12, 2022 - 2:05:46 PM
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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, American Astronomical Society, 2020, 889 (2), pp.140. ⟨10.3847/1538-4357/ab64f9⟩. ⟨hal-03518334⟩

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