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Published February 1, 2020 | Published + Accepted Version
Journal Article Open

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


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.

Additional Information

© 2020 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2019 April 27; revised 2019 December 21; accepted 2019 December 23; published 2020 February 3. We are grateful to the anonymous referee for constructive suggestions that improved our paper. This paper used data collected by the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan (NAOJ) and the National Institutes of Natural Sciences (NINS). We thank the Subaru Telescope staff for their support during the observations. This paper made use of the following ALMA data: ADS/JAO.ALMA#2013.1.00105.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), NSC, ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, auI/NRAO, and NAOJ. We would also like to acknowledge the access given to us to the SIMBAD database operated by the Strasbourg Astronomical Data Center (CDS), Strasbourg, France. IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (auRA) under a cooperative agreement with the National Science Foundation. M.T. is supported by a grant-in-Aid for Scientific Research (no. 15H02063). E.A. is supported by MEXT/JSPS KAKENHI grant no. 17K05399.

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Published - Yang_2020_ApJ_889_140.pdf

Accepted Version - 1912.11301.pdf


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August 19, 2023
October 20, 2023