A survey of 10-μm silicate emission from dust around young sun-like stars

被引：7

作者：

Gaidos, E ^{[1
]}

Koresko, C

机构：

[1] Univ Hawaii, Dept Geol & Geophys, Honolulu, HI 96822 USA

[2] Michelson Sci Ctr, Pasadena, CA 91125 USA

来源：

NEW ASTRONOMY | 2004年 / 9卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

interplanetary medium; circumstellar matter; planetary systems : protoplanetary disks; infrared : stars;

D O I：

10.1016/j.newast.2003.07.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We obtained low resolution (R = 100) mid-infrared (8-13 mum wavelengths) spectra of 8 nearby young main sequence stars with the Keck 1 telescope and Long-Wavelength Spectrometer (LWS) to search for 10 mum silicate (Si-O stretch) emission from circumstellar dust. No stars exhibited readily apparent emission: Spectra were then analyzed by least-squares fitting of a template based on a spectrum of Comet Hale-Bopp. Using this technique, we were able to constrain the level of silicate emission to a threshold 10 times below what was previously possible from space. We found one star, HD 17925, with a spectrum statistically different from its calibrator and consistent with a silicate emission peak of 7% of the photosphere at a wavelength of 10 mum. Excess emission at 60 mum from this star has already been reported. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：33 / 42

页数：10

共 36 条

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