JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

このアイテムに関連するファイルはありません。

タイトルVariability of Disk Emission in Pre-Main Sequence and Related Stars. III. Exploring Structural Changes in the Pre-Transitional Disk in HD 169142
本文(外部サイト)http://hdl.handle.net/2060/20150008997
著者(英)Sitko, Michael L.; Wagner, Kevin R.; Woodgate, Bruce E.; Whitney, Barbara A.; Fukagawa, Misato; Wisniewski, John P; Momose, Munetake; Currie, Thayne M.; Lauroesch, James T.; Swearingen, Jeremy R.; Muto, Takayuki; Schneider, Glenn H.; Hornbeck, Jeremy; Werren, Chelsea; Johnson, Alexa N.; Russell, Ray W.; Grady, Carol A.; Inoue, Akio K.; Brown, Alexander; Champney, Elizabeth H.
著者所属(英)NASA Goddard Space Flight Center
発行日2014-12-31
言語eng
内容記述We present near-IR (NIR) and far-UV observations of the pre-transitional (gapped) disk in HD 169142 using NASA's Infrared Telescope Facility and Hubble Space Telescope. The combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability of up to 45% between (is) approximately1.5-10 micrometers over a maximum timescale of 10 yr. All observations known to us separate into two distinct states corresponding to a high near-IR state in the pre-2000 epoch and a low state in the post-2000 epoch, indicating activity within the (is) approximately less than 1AU region of the disk. Through analysis of the Pa beta and Br gamma lines in our data we derive a mass accretion rate in 2013 May of M (is) approx. = (1.5-2.7) 10(exp -9) solar mass yr(exp -1).We present a theoretical modeling analysis of the disk in HD 169142 using Monte-Carlo radiative transfer simulation software to explore the conditions and perhaps signs of planetary formation in our collection of 24 yr of observations. We find that shifting the outer edge (r (is) approx. = 0.3AU) of the inner disk by 0.05AU toward the star (in simulation of accretion and/or sculpting by forming planets) successfully reproduces the shift in NIR flux. We establish that the (is) approximately 40-70AU dark ring imaged in the NIR by Quanz et al. and Momose et al. and at 7 mm by Osorio et al. may be reproduced with a 30% scaled density profile throughout the region, strengthening the link to this structure being dynamically cleared by one or more planetary mass bodies.
NASA分類Astrophysics
レポートNOGSFC-E-DAA-TN22100
権利Copyright, Distribution under U.S. Government purpose rights


このリポジトリに保管されているアイテムは、他に指定されている場合を除き、著作権により保護されています。