Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 760, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/760/2/L26
Keywords
planetary systems; protoplanetary disks; stars: pre-main sequence; techniques: polarimetric
Categories
Funding
- MEXT [22000005]
- KAKENHI [23103004, 24103504, 24840037]
- US NSF grant [1009314, 1009203]
- Center for the Promotion of Integrated Sciences (CPIS) of The Graduate University for Advanced Studies (SOKENDAI)
- Grants-in-Aid for Scientific Research [23740151, 21244022, 24103504, 23103001, 11J00271, 22000005, 24840037, 23103004] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009314, 1009203] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0901967, 1008440] Funding Source: National Science Foundation
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We report high-resolution (0.07 arcsec) near-infrared polarized intensity images of the circumstellar disk around the star 2MASS J16042165-2130284 obtained with HiCIAO mounted on the Subaru 8.2 m telescope. We present our H-band data, which clearly exhibit a resolved, face-on disk with a large inner hole for the first time at infrared wavelengths. We detect the centrosymmetric polarization pattern in the circumstellar material as has been observed in other disks. Elliptical fitting gives the semimajor axis, semiminor axis, and position angle (P.A.) of the disk as 63 AU, 62 AU, and -14 degrees, respectively. The disk is asymmetric, with one dip located at P.A.s of similar to 85 degrees. Our observed disk size agrees well with a previous study of dust and CO emission at submillimeter wavelength with Submillimeter Array. Hence, the near-infrared light is interpreted as scattered light reflected from the inner edge of the disk. Our observations also detect an elongated arc (50 AU) extending over the disk inner hole. It emanates at the inner edge of the western side of the disk, extending inward first, then curving to the northeast. We discuss the possibility that the inner hole, the dip, and the arc that we have observed may be related to the existence of unseen bodies within the disk.
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