The Complete Census of 70 μm-Bright Debris Disks within “The Formation and Evolution of Planetary Systems” Spitzer Legacy Survey of Sun-like Stars
The Complete Census of 70 μm-Bright Debris Disks within “The Formation and Evolution of Planetary Systems” Spitzer Legacy Survey of Sun-like Stars
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“行星系统的形成和演化”斯皮策类太阳恒星遗产巡天中对 70 微米明亮碎片盘的完整普查
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Bouwman
中科院分区：
文献类型：
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作者：
L. Hillenbrand;J. Carpenter;J. Kim;M. Meyer;D. Backman;A. Moro;D. Hollenbach;D. Hines;I. Pascucci;J. Bouwman
我们报告检测冷尘埃周围的太阳型恒星的观测作为斯皮策遗产科学计划FEPS的一部分。从328颗年龄约为0.003-3 Gyr的恒星样本中，我们选择了70 μm通量密度的源，这表明它们的SED超过了预期的光球发射。六个强烈的过剩源可能是原始的星周盘，星星形成过程的残余物。另外25个超过3 σ的来源与尘埃碎片盘有关，这些尘埃碎片盘是由可能被现有行星搅动的小行星带内的碰撞产生的。另外6个超过2 σ的源需要确认为碎片盘。在我们的分析中，大多数（>80%）70 μm过剩源在33 μm处也有≥3 σ过剩，而只有少数（<40%）在24 μm处有≥3 σ过剩。向70 μm（甚至超过70 μm）方向上升的SEDs意味着，与恒星辐射场平衡的碎片的尘埃温度< 45-85 K。从拟合的单温度黑体模型，我们推断散装灰尘的特性，如特征温度，位置，部分光度和质量。对于>的碎片源，我们发现，多个温度分量的建议，这意味着尘埃分布在几十个Au。由于盘主要是由碰撞过程，母体（星子）带也可能延长。对类太阳恒星周围冷碎片统计数据的初步评估表明，质量在0.6到1.8 M之间、年龄在3000万年到3Gyr之间的FEPS目标中，约有10%的目标表现出超过70 μm的辐射。我们发现，分数过剩振幅出现较高的年轻恒星，并可能有一个趋势，在70 μm的过剩频率与恒星质量。
We report detection of cool dust surrounding solar-type stars from observations performed as part of the Spitzer Legacy Science Program FEPS. From a sample of 328 stars having ages ~0.003-3 Gyr we have selected sources with 70 μm flux densities indicating excess in their SEDs above expected photospheric emission. Six strong excess sources are likely primordial circumstellar disks, remnants of the star formation process. Another 25 sources having ≥3 σ excesses are associated with dusty debris disks, generated by collisions within planetesimal belts that are possibly stirred by existing planets. Six additional sources with ≥2 σ excesses require confirmation as debris disks. In our analysis, most (>80%) 70 μm excess sources have ≥3 σ excesses at 33 μm as well, while only a minority (<40%) have ≥3 σ excesses at 24 μm. The rising SEDs toward (and perhaps beyond) 70 μm imply dust temperatures < 45–85 K for debris in equilibrium with the stellar radiation field. From fitted single-temperature blackbody models we infer bulk dust properties such as characteristic temperature, location, fractional luminosity, and mass. For > of the debris sources we find that multiple temperature components are suggested, implying a dust distribution extending over many tens of AU. Because the disks are dominated by collisional processes, the parent body (planetesimal) belts may be extended as well. Preliminary assessment of the statistics of cold debris around Sun-like stars shows that ~10% of FEPS targets with masses between 0.6 and 1.8 M☉ and ages between 30 Myr and 3 Gyr exhibit excess 70 μm emission. We find that fractional excess amplitudes appear higher for younger stars and that there may be a trend in 70 μm excess frequency with stellar mass.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell