Imaging of a Transitional Disk Gap in Reflected Light: Indications of Planet Formation Around the Young Solar Analog LkCa 15

Дата и время публикации : 2010-05-27T20:00:03Z

Авторы публикации и институты :
C. Thalmann (Max Planck Institute for Astronomy, Heidelberg, Germany)
C. A. Grady (Eureka Scientific and Goddard Space Flight Center, Greenbelt, USA)
M. Goto (Max Planck Institute for Astronomy, Heidelberg, Germany)
J. P. Wisniewski (University of Washington, Seattle, Washington, USA)
M. Janson (University of Toronto, Toronto, Canada)
T. Henning (Max Planck Institute for Astronomy, Heidelberg, Germany)
M. Fukagawa (Osaka University, Osaka, Japan)
M. Honda (Faculty of Science, Kanagawa University, Kanagawa, Japan)
G. D. Mulders (Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Amsterdam, The Netherlands, SRON Netherlands Institute for Space Research, Groningen, The Netherlands)
M. Min (Astronomical Institute, University of Utrecht, Utrecht, The Netherlands)
A. Moro-Martín (Department of Astrophysics, CAB – CSIC/INTA, Madrid, Spain)
M. W. McElwain (Department of Astrophysical Sciences, Princeton University, Princeton, USA)
K. W. Hodapp (Institute for Astronomy, University of Hawai`i, Hilo, Hawai`i, USA)
J. Carson (Max Planck Institute for Astronomy, Heidelberg, Germany, College of Charleston, Charleston, South Carolina, USA)
L. Abe (Laboratoire Hippolyte Fizeau, Nice, France)
W. Brandner (Max Planck Institute for Astronomy, Heidelberg, Germany)
S. Egner (Subaru Telescope, Hilo, Hawai`i, USA)
M. Feldt (Max Planck Institute for Astronomy, Heidelberg, Germany)
T. Fukue (National Astronomical Observatory of Japan, Tokyo, Japan)
T. Golota (Subaru Telescope, Hilo, Hawai`i, USA)
O. Guyon (Subaru Telescope, Hilo, Hawai`i, USA)
J. Hashimoto (National Astronomical Observatory of Japan, Tokyo, Japan)
Y. Hayano (Subaru Telescope, Hilo, Hawai`i, USA)
M. Hayashi (Subaru Telescope, Hilo, Hawai`i, USA)
S. Hayashi (Subaru Telescope, Hilo, Hawai`i, USA)
M. Ishii (Subaru Telescope, Hilo, Hawai`i, USA)
R. Kandori (National Astronomical Observatory of Japan, Tokyo, Japan)
G. R. Knapp (Department of Astrophysical Sciences, Princeton University, Princeton, USA)
T. Kudo (National Astronomical Observatory of Japan, Tokyo, Japan)
N. Kusakabe (National Astronomical Observatory of Japan, Tokyo, Japan)
M. Kuzuhara (National Astronomical Observatory of Japan, Tokyo, Japan, University of Tokyo, Tokyo, Japan)
T. Matsuo (National Astronomical Observatory of Japan, Tokyo, Japan)
S. Miyama (National Astronomical Observatory of Japan, Tokyo, Japan)
J. -I. Morino (National Astronomical Observatory of Japan, Tokyo, Japan)
T. Nishimura (Subaru Telescope, Hilo, Hawai`i, USA)
T. -S. Pyo (Subaru Telescope, Hilo, Hawai`i, USA)
E. Serabyn (JPL, California Institute of Technology, Pasadena, USA)
H. Shibai (Osaka University, Osaka, Japan)
H. Suto (National Astronomical Observatory of Japan, Tokyo, Japan)
R. Suzuki (National Astronomical Observatory of Japan, Tokyo, Japan)
M. Takami (Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan)
N. Takato (Subaru Telescope, Hilo, Hawai`i, USA)
H. Terada (Subaru Telescope, Hilo, Hawai`i, USA)
D. Tomono (Subaru Telescope, Hilo, Hawai`i, USA)
E. L. Turner (Department of Astrophysical Sciences, Princeton University, Princeton, USA, Institute for the Physics and Mathematics of the Universe, University of Tokyo, Japan)
M. Watanabe (Department of Cosmosciences, Hokkaido University, Sapporo, Japan)
T. Yamada (Astronomical Institute, Tohoku University, Sendai, Japan)
H. Takami (Subaru Telescope, Hilo, Hawai`i, USA)
T. Usuda (Subaru Telescope, Hilo, Hawai`i, USA)
M. Tamura (National Astronomical Observatory of Japan, Tokyo, Japan)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 5 pages, 4 figures, accepted for publication in ApJ Letters. Minor change to Figure 4
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR, astro-ph.EP

Краткий обзор статьи: We present H- and Ks-band imaging data resolving the gap in the transitional disk around LkCa 15, revealing the surrounding nebulosity. We detect sharp elliptical contours delimiting the nebulosity on the inside as well as the outside, consistent with the shape, size, ellipticity, and orientation of starlight reflected from the far-side disk wall, whereas the near-side wall is shielded from view by the disk’s optically thick bulk. We note that forward-scattering of starlight on the near-side disk surface could provide an alternate interpretation of the nebulosity. In either case, this discovery provides confirmation of the disk geometry that has been proposed to explain the spectral energy distributions (SED) of such systems, comprising an optically thick outer disk with an inner truncation radius of ~46 AU enclosing a largely evacuated gap. Our data show an offset of the nebulosity contours along the major axis, likely corresponding to a physical pericenter offset of the disk gap. This reinforces the leading theory that dynamical clearing by at least one orbiting body is the cause of the gap. Based on evolutionary models, our high-contrast imagery imposes an upper limit of 21 Jupiter masses on companions at separations outside of 0.1" and of 13 Jupiter masses outside of 0.2". Thus, we find that a planetary system around LkCa 15 is the most likely explanation for the disk architecture.

Category: Physics