研究目的
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.
研究成果
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.
研究不足
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.
1:Experimental Design and Method Selection
High-resolution near-infrared polarimetric imaging observations were conducted using HiCIAO mounted on the Subaru 8.2 m telescope. The observations aimed to resolve the circumstellar structures around SR 24 with 0.1 resolution.
2:Sample Selection and Data Sources
The target was the SR 24 hierarchical triple system, located in the Ophiuchus star-forming region. Data were collected at the Subaru Telescope.
3:List of Experimental Equipment and Materials
HiCIAO (High Contrast Instrument for the Subaru Next Generation Adaptive Optics) mounted on the Subaru 8.2 m telescope, adaptive optics system (AO 188).
4:Experimental Procedures and Operational Workflow
Polarimetry in the H band (1.6 μm) was performed. The exposures were sequentially performed at four position angles of the half-wave plate to measure the Stokes parameters. The integration time per wave plate position was 15 s, with a total integration time of 1140 s for the polarization intensity image.
5:Data Analysis Methods
The Image Reduction and Analysis Facility software (IRAF) was used for data reduction. Polarimetric differential imaging was adopted to obtain polarization intensity images.
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