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Subaru Near-infrared Imaging Polarimetry of Misaligned Disks around the SR 24 Hierarchical Triple System

DOI:10.3847/1538-3881/ab5850 期刊:The Astronomical Journal 出版年份:2019 更新时间:2025-09-16 10:30:52
摘要: The SR 24 multistar system hosts both circumprimary and circumsecondary disks, which are strongly misaligned with each other. The circumsecondary disk is circumbinary in nature. Interestingly, both disks are interacting, and they possibly rotate in opposite directions. To investigate the nature of this unique twin disk system, we present 0 1 resolution near-infrared polarized intensity images of the circumstellar structures around SR 24, obtained with HiCIAO mounted on the Subaru 8.2 m telescope. Both the circumprimary disk and the circumsecondary disk are resolved and have elongated features. While the position angle of the major axis and radius of the near-IR (NIR) polarization disk around SR 24S are 55° and 137 au, respectively, those around SR 24N are 110° and 34 au, respectively. With regard to overall morphology, the circumprimary disk around SR 24S shows strong asymmetry, whereas the circumsecondary disk around SR 24N shows relatively strong symmetry. Our NIR observations confirm the previous claim that the circumprimary and circumsecondary disks are misaligned from each other. Both the circumprimary and circumsecondary disks show similar structures in 12CO observations in terms of its size and elongation direction. This consistency is because both NIR and 12CO are tracing surface layers of the flared disks. As the radius of the polarization disk around SR 24N is roughly consistent with the size of the outer Roche lobe, it is natural to interpret the polarization disk around SR 24N as a circumbinary disk surrounding the SR 24Nb–Nc system.
作者: Satoshi Mayama,Sebastián Pérez,Michihiro Takami,Jun Hashimoto,Nobuhiko Kusakabe,Takayuki Muto,Takashi Tsukagoshi,Jungmi Kwon,Michael L. Sitko,Saeko S. Hayashi,Tomoyuki Kudo,Ruobing Dong,Thayne Currie,Markus Feldt,Masahiko Hayashi,Masayuki Kuzuhara,Katherine Follette,Jerome de Leon,Eiji Akiyama,John P. Wisniewski,Michael Bonnefoy,Joseph C. Carson,Jeffrey Chilcote,Timothy D. Brandt,Miwa Goto,Carol A. Grady,Tyler Groff,Olivier Guyon,Miki Ishii,Masanori Iye,Thomas Henning,Klaus W. Hodapp,Misato Fukagawa,Yutaka Hayano,Markus Janson,Munetake Momose,Daehyeon Oh,Yi Yang,Lyu Abe,Wolfgang Brandner,Ryo Kandori,Michael W. McElwain,Jeremy Kasdin,Gillian R. Knapp,Shoken Miyama,Tetsuo Nishimura,Tae-Soo Pyo,Evan A. Rich,Naruhisa Takato,Hiroshi Terada,Christian Thalmann,Jun-Ichi Morino,Amaya Moro-Martin,Julien Lozi,Frantz Martinache,Nemanja Jovanovic,Taro Matsuo,Takao Nakagawa,Eugene Serabyn,Hiroshi Suto,Ryuji Suzuki,Daigo Tomono,Edwin L. Turner,Makoto Watanabe,Toru Yamada,Hideki Takami,Tomonori Usuda,Taichi Uyama,Motohide Tamura
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To investigate the nature of the unique twin disk system around the SR 24 hierarchical triple system, focusing on the misalignment between the circumprimary and circumsecondary disks and their interaction.

The study confirmed the misalignment between the circumprimary and circumsecondary disks around SR 24. The circumprimary disk around SR 24S shows strong asymmetry, while the circumsecondary disk around SR 24N shows relatively strong symmetry. Both disks exhibit similar structures in NIR and 12CO observations, tracing surface layers of the flared disks. The polarization disk around SR 24N is interpreted as a circumbinary disk surrounding the SR 24Nb–Nc system.

The observations were limited by the signal-to-noise ratio, which may have affected the detection of certain structures like the bridge and spiral arm previously observed. The resolution was insufficient to spatially resolve SR 24Nb–Nc.

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