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| ID:
720414.0,
MPI für Astronomie / Publikationen_mpia |
| Discovery of a disk gap candidate at 20 AU in TW Hydrae |
| Authors: | Akiyama, E.; Muto, T.; Kusakabe, N.; Kataoka, A.; Hashimoto, J.; Tsukagoshi, T.; Kwon, J.; Kudo, T.; Kandori, R.; Grady, C. A.; Takami, M.; Janson, M.; Kuzuhara, M.; Henning, T.; Sitko, M. L.; Carson, J. C.; Mayama, S.; Currie, T.; Thalmann, C.; Wisniewski, J.; Momose, M.; Ohashi, N.; Abe, L.; Brandner, W.; Brandt, T. D.; Egner, S.; Feldt, M.; Goto, M.; Guyon, O.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Hodapp, K. W.; Ishi, M.; Iye, M.; Knapp, G. R.; Matsuo, T.; Mcelwain, M. W.; Miyama, S.; Morino, J. -. I.; Moro-Martin, A.; Nishimura, T.; Pyo, T. -. S.; Serabyn, G.; Suenaga, T.; Suto, H.; Suzuki, R.; Takahashi, Y. H.; Takato, N.; Terada, H.; Tomono, D.; Turner, E. L.; Watanabe, M.; Yamada, T.; Takami, H.; Usuda, T.; Tamura, M. | | Date of Publication (YYYY-MM-DD): | 2015 | | Title of Journal: | The Astrophysical Journal Letters | | Volume: | 802 | | Issue / Number: | 2 | | Start Page: | id. L17 (5 pp) | | Audience: | Not Specified | | Abstract / Description: | We present a new Subaru/HiCIAO high-contrast H-band polarized intensity (PI) image of a nearby transitional disk associated with TW Hydrae. The scattered light from the disk was detected from 0.″ 2 to 1.″ 5 (11–81 AU) and the PI image shows a clear axisymmetric depression in PI at ∼0.″ 4 (∼20 AU) from the central star, similar to the ∼80 AU gap previously reported from Hubble Space Telescope images. The azimuthal PI profile also shows that the disk beyond 0.″ 2 is almost axisymmetric. We discuss two possible scenarios explaining the origin of the PI depression: (1) a gap structure may exist at ∼20 AU from the central star because of a shallow slope seen in the PI profile, and (2) grain growth may be occurring in the inner region of the disk. Multi-band observations at near-infrared and millimeter/submillimeter wavelengths play a complementary role in investigating dust opacity and may help reveal the origin of the gap more precisely. | | Free Keywords: | planetary systems; protoplanetary disks; stars: individual: TW Hydrae; stars: pre-main sequence; techniques: polarimetric | | External Publication Status: | published | | Document Type: | Article |
| Communicated by: | N. N. | | Affiliations: | MPI für Astronomie | | Identifiers: | ISSN:0004-637X
URL:http://cdsads.u-strasbg.fr/abs/2015ApJ...802L..17A
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