@inproceedings{oai:jaxa.repo.nii.ac.jp:00020651,
 author = {田中, 秀和 and 姫野, 洋平 and 井田, 茂 and Tanaka, Hidekazu and Himeno, Yohei and Ida, Shigeru},
 book = {第36回月・惑星シンポジウム, Proceedings of the 36th ISAS Lunar and Planetary Symposium},
 month = {Nov},
 note = {The infrared excess in the SEDs (Spectral Energy Distributions) of protoplanetary disks is observed only around stars younger than approximately 10(exp 7) yr. This is thought to be because the life time of protoplanetary disks is less than approximately 10(exp 7) yr. This short life time of protoplanetary disks is a strong constraint in the theory of planet formation. In this study, simulations of dust growth and settling in passive disks are performed and evolution of optical properties of protoplanetary disks due to dust growth in the WTTS stage is investigated. Dust particles grow and settle toward the equatorial plane of the disk within 10(exp 3) Keplerian periods and a dust layer formed. As a result of growth, dust particles have a power-law size distribution with the index of - 3. The dust growth decreases optical thickness of the disk. Since the dust growth proceeds rapidly at the inner part of disks, the decrease in disk optical thickness is more significant in the inner part than the outer part. It was found that the dust growth can reproduce the decay in luminosity of infrared radiation in approximately 10(exp 6 to 7) yr. This result suggests that the life time of protoplanetary disks can be longer than 10(exp 7) yr. Hence, the decay in the infrared excess of the SEDs does not constrain the formation time of giant planet in gaseous disks to approximately 10(exp 6) years., 資料番号: AA0046650002},
 pages = {5--8},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {SED evolution of protoplanetary disks due to dust growth},
 year = {2003}
}