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AuthorsN. Kusakabe, C.A. Grady, M.L. Sitko, J. Hashimoto, T. Kudo, M. Fukagawa, T. Muto, J.P. Wisniewski, M. Min, S. Mayama, C. Werren, A.N. Day, L.C. Beerman, D.K. Lynch, D.W. Russell, S.M. Brafford, M. Kuzuhara, T.D. Brandt, L. Abe, W. Brandner, J. Carson, S. Egner, M. Feldt, M. Goto, O. Guyon, Y. Hayano, M. Hayashi, S.S. Hayashi, T. Henning, K.W. Hodapp, M. Ishii, M. Iye, M. Janson, R. Kandori, G.R. Knapp, T. Matsuo, M.W. McElwain, S. Miyama, J.-I. Morino, A. Moro-Martin, T. Nishimura, T.-S. Pyo, H. Suto, R. Suzuki, M. Takami, N. Takato, H. Terada, C. Thalmann, D. Tomono, E.L. Turner, M. Watanabe, T. Yamada, H. Takami, T. Usuda, M. Tamura
TitleHigh-contrast Near-infrared Polarization Imaging of MWC480
JournalAstrophysical Journal
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractOne of the key predictions of modeling from the IR excess of Herbig Ae stars is that for protoplanetary disks, where significant grain growth and settling has occurred, the dust disk has flattened to the point that it can be partially or largely shadowed by the innermost material at or near the dust sublimation radius. When the self-shadowing has already started, the outer disk is expected to be detected in scattered light only in the exceptional cases when the scale height of the dust disk at the sublimation radius is smaller than usual. High-contrast imaging combined with the IR spectral energy distribution allow us to measure the degree of flattening of the disk, as well as to determine the properties of the outer disk. We present polarimetric differential imaging in the H band obtained with Subaru/HiCIAO of one such system, MWC 480. The HiCIAO data were obtained at a historic minimum of the NIR excess. The disk is detected in scattered light from 0farcs2 to 1farcs0 (27.4-137 AU). Together with the marginal detection of the disk from 1998 February 24 by Hubble Space Telescope/NICMOS, our data constrain the opening half-angle for the disk to lie between 1fdg3 ≤θ ≤ 2fdg2. When compared with similar measures in CO for the gas disk from the literature, the dust disk subtends only ~30% of the gas disk scale height (H/R ~ 0.03). Such a dust disk is a factor of 5-7 flatter than transitional disks, which have structural signatures that giant planets have formed.
Document typeArticle
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