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2016ApJ...831L...7O - Astrophys. J., 831, L7-L7 (2016/November-1)

Resolved near-infrared image of the inner cavity in the GM Aur transitional disk.

OH D., HASHIMOTO J., CARSON J.C., JANSON M., KWON J., NAKAGAWA T., MAYAMA S., UYAMA T., YANG Y., KUDO T., KUSAKABE N., ABE L., AKIYAMA E., BRANDNER W., BRANDT T.D., CURRIE T., FELDT M., GOTO M., GRADY C.A., GUYON O., HAYANO Y., HAYASHI M., HAYASHI S.S., HENNING T., HODAPP K.W., ISHII M., IYE M., KANDORI R., KNAPP G.R., KUZUHARA M., MATSUO T., McELWAIN M.W., MIYAMA S., MORINO J.-I., MORO-MARTIN A., NISHIMURA T., PYO T.-S., SERABYN E., SUENAGA T., SUTO H., SUZUKI R., TAKAHASHI Y.H., TAKATO N., TERADA H., THALMANN C., TURNER E.L., WATANABE M., YAMADA T., TAKAMI H., USUDA T. and TAMURA M.

Abstract (from CDS):

We present high-contrast H-band polarized intensity (PI) images of the transitional disk around the young solar-like star GM Aur. The near-infrared direct imaging of the disk was derived by polarimetric differential imaging using the Subaru 8.2 m Telescope and HiCIAO. An angular resolution and an inner working angle of 0.''07 and r ∼ 0.''05, respectively, were obtained. We clearly resolved a large inner cavity, with a measured radius of 18 ± 2 au, which is smaller than that of a submillimeter interferometric image (28 au). This discrepancy in the cavity radii at near-infrared and submillimeter wavelengths may be caused by a 3-4 MJup planet about 20 au away from the star, near the edge of the cavity. The presence of a near-infrared inner cavity is a strong constraint on hypotheses for inner cavity formation in a transitional disk. A dust filtration mechanism has been proposed to explain the large cavity in the submillimeter image, but our results suggest that this mechanism must be combined with an additional process. We found that the PI slope of the outer disk is significantly different from the intensity slope obtained from HST/NICMOS, and this difference may indicate the grain growth process in the disk.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): circumstellar matter - protoplanetary disks - stars: individual: GM Aur - stars: pre-main sequence - stars: pre-main sequence

Simbad objects: 5

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2020.09.23-18:59:13

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