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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 693431.0, MPI für Astronomie / Publikationen_mpia
Imaging discovery of the debris disk around HIP 79977
Authors:Thalmann, C.; Janson, M.; Buenzli, E.; Brandt, T. D.; Wisniewski, J. P.; Dominik, C.; Carson, J.; McElwain, M. W.; Currie, T.; Knapp, G. R.; Moro-Martín, A.; Usuda, T.; Abe, L.; Brandner, W.; Egner, S.; Feldt, M.; Golota, T.; Goto, M.; Guyon, O.; Hashimoto, J.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Henning, T.; Hodapp, K. W.; Ishii, M.; Iye, M.; Kandori, R.; Kudo, T.; Kusakabe, N.; Kuzuhara, M.; Kwon, J.; Matsuo, T.; Mayama, S.; Miyama, S.; Morino, J. -. I.; Nishimura, T.; Pyo, T. -. S.; Serabyn, E.; Suto, H.; Suzuki, R.; Takami, M.; Takato, N.; Terada, H.; Tomono, D.; Turner, E. L.; Watanabe, M.; Yamada, T.; Takami, H.; Tamura, M.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal Letters
Volume:763
Issue / Number:2
Start Page:id. L29 (7 pp)
Audience:Not Specified
Abstract / Description:We present Subaru/HiCIAO H-band high-contrast images of the debris disk around HIP 79977, whose presence was recently inferred from an infrared excess. Our images resolve the disk for the first time, allowing characterization of its shape, size, and dust grain properties. We use angular differential imaging (ADI) to reveal the disk geometry in unpolarized light out to a radius of ~2'', as well as polarized differential imaging to measure the degree of scattering polarization out to ~1.''5. In order to strike a favorable balance between suppression of the stellar halo and conservation of disk flux, we explore the application of principal component analysis to both ADI and reference star subtraction. This allows accurate forward modeling of the effects of data reduction on simulated disk images, and thus direct comparison with the imaged disk. The resulting best-fit values and well-fitting intervals for the model parameters are a surface brightness power-law slope of S out = –3.2[ – 3.6, –2.9], an inclination of i = 84°[81°, 86°], a high Henyey-Greenstein forward-scattering parameter of g = 0.45[0.35, 0.60], and a non-significant disk-star offset of u = 3.0[ – 1.5, 7.5] AU = 24[ – 13, 61] mas along the line of nodes. Furthermore, the tangential linear polarization along the disk rises from ~10% at 0.''5 to ~45% at 1.''5. These measurements paint a consistent picture of a disk of dust grains produced by collisional cascades and blown out to larger radii by stellar radiation pressure. Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Free Keywords:circumstellar matter; planetary systems; stars: individual: HIP 79977; techniques: high angular resolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/2041-8205/763/2/L29
URL:http://cdsads.u-strasbg.fr/abs/2013ApJ...763L..29T
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