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High-resolution Near-infrared Polarimetry and Submillimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System
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Number of Authors: 592020 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 889, no 2, article id 140Article in journal (Refereed) Published
Abstract [en]

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 similar 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.

Place, publisher, year, edition, pages
2020. Vol. 889, no 2, article id 140
National Category
Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-181096DOI: 10.3847/1538-4357/ab64f9ISI: 000524908900001OAI: oai:DiVA.org:su-181096DiVA, id: diva2:1427235
Available from: 2020-04-29 Created: 2020-04-29 Last updated: 2022-03-23Bibliographically approved

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Janson, Markus

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