THE FREQUENCY OF WARM DEBRIS DISKS AND TRANSITION DISKS IN A COMPLETE SAMPLE OF INTERMEDIATE-MASS GLIMPSE STARS: PLACING CONSTRAINTS ON DISK LIFETIMES
THE FREQUENCY OF WARM DEBRIS DISKS AND TRANSITION DISKS IN A COMPLETE SAMPLE OF INTERMEDIATE-MASS GLIMPSE STARS: PLACING CONSTRAINTS ON DISK LIFETIMES
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中等质量瞥见恒星完整样本中热碎片盘和过渡盘的频率：对盘寿命的限制
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发表时间：
2008
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影响因子：
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通讯作者：
K. Kinemuchi
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作者：
B. Uzpen;H. Kobulnicky;K. Kinemuchi;K. Kinemuchi
为了了解行星形成的早期阶段，低质量和中等质量恒星周围尘埃碎片盘的发生率已经被多次研究。最值得注意的是，红外天文卫星 (IRAS) 任务在中红外和远红外 (IR) 波长下观察了整个天空，识别出第一个碎片盘系统，但由于其在 12 μm 的灵敏度有限，无法检测到具有统计意义的暖碎片盘样本。使用先前在斯皮策银河遗产红外中面巡天 (GLIMPSE) 巡天中证实的 24 μm 的第谷-2 光谱目录恒星，我们研究了完整体积有限样本中中等质量 (2-4 M☉) 恒星中中红外过剩的频率。我们对 338 颗恒星的研究比 IRAS 点源目录中 12 μm 源的完整样本大四倍。我们发现 0.3% ± 0.3% 的中等质量恒星在 8 μm 及以上的波长处表现出可能是地温碎片盘的特征。我们还发现 1.2% ± 0.6% 的中等质量恒星表现出星周盘经历内盘清理的证据，即候选过渡盘系统。使用给定光谱类型内的恒星寿命以及过渡盘和原始盘的频率，我们发现中等质量恒星周围的前主序盘在 5 ± 2 Myr 内消散，这与其他研究一致。
The incidence of dusty debris disks around low- and intermediate-mass stars has been investigated numerous times in order to understand the early stages of planet formation. Most notably, the Infrared Astronomical Satellite (IRAS) mission observed the entire sky at mid- and far-infrared (IR) wavelengths, identifying the first debris disk systems, but was unable to detect a statistically significant sample of warm debris disks due to its limited sensitivity at 12 μm. Using Tycho-2 Spectral Catalog stars previously shown to exhibit 8 μm mid-IR circumstellar excesses confirmed at 24 μm in the Spitzer Galactic Legacy Infrared MidPlane Survey Extraordinaire (GLIMPSE) survey, we investigate the frequency of mid-IR excesses among intermediate-mass (2–4 M☉) stars in a complete volume-limited sample. Our study of 338 stars is four times larger than a complete sample of 12 μm sources from the IRAS Point Source Catalog. We find that 0.3% ± 0.3% of intermediate-mass stars exhibit a signature of a possible terrestrial-temperature debris disks at wavelengths of 8 μm and greater. We also find that 1.2% ± 0.6% of intermediate-mass stars exhibit evidence for circumstellar disks undergoing inner disk clearing, i.e., candidate transition disk systems. Using stellar lifetimes and the frequency of transition and primordial disks within a given spectral type, we find that pre-main-sequence disks around intermediate-mass stars dissipate in 5 ± 2 Myr, consistent with other studies.