A HERSCHEL SURVEY OF COLD DUST IN DISKS AROUND BROWN DWARFS AND LOW-MASS STARS
文献类型：期刊论文
| 作者 | Harvey, Paul M.1; Henning, Thomas2; Liu, Yao3,4 ; Menard, Francois5; Pinte, Christophe5; Wolf, Sebastian3; Cieza, Lucas A.6; Evans, Neal J., II1; Pascucci, Ilaria7
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-08-10 |
| 卷号 | 755期号:1页码:67(13pp) |
| 关键词 | brown dwarfs protoplanetary disks stars: formation |
| ISSN号 | 0004-637X |
| 英文摘要 | We report the complete photometric results from our Herschel study which is the first comprehensive program to search for far-infrared emission from cold dust around young brown dwarfs (BDs). We surveyed 50 fields containing 51 known or suspected BDs and very low mass stars that have evidence of circumstellar disks based on Spitzer photometry and/or spectroscopy. The objects with known spectral types range from M3 to M9.5. Four of the candidates were subsequently identified as extragalactic objects. Of the remaining 47 we have successfully detected 36 at 70 mu m and 14 at 160 mu m with signal-to-noise ratio (S/N) greater than 3, as well as several additional possible detections with low S/N. The objects exhibit a range of [24]-[70] mu m colors suggesting a range in mass and/or structure of the outer disk. We present modeling of the spectral energy distributions of the sample and discuss trends visible in the data. Using two Monte Carlo radiative transfer codes we investigate disk masses and geometry. We find a very wide range in modeled total disk masses from less than 10(-6) M-circle dot up to 10(-3) M-circle dot with a median disk mass of the order of 3 x 10(-5) M-circle dot, suggesting that the median ratio of disk mass to central object mass may be lower than for T Tauri stars. The disk scale heights and flaring angles, however, cover a range consistent with those seen around T Tauri stars. The host clouds in which the young BDs and low-mass stars are located span a range in estimated age from similar to 1-3 Myr to similar to 10 Myr and represent a variety of star-forming environments. No obvious dependence on cloud location or age is seen in the disk properties, though the statistical significance of this conclusion is not strong. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | TW-HYDRAE-ASSOCIATION ; SCORPIUS OB ASSOCIATION ; SPITZER-SPACE-TELESCOPE ; FORMING REGION ; RADIATIVE-TRANSFER ; SIGMA-ORIONIS ; PROTOPLANETARY DISKS ; C2D SURVEY ; POPULATION ; YOUNG |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000306909500067 |
| 公开日期 | 2013-01-31 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8005]  |
| 专题 | 紫金山天文台_分子云与恒星形成研究团组 |
| 作者单位 | 1.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA 2.Max Planck Inst Astron, D-69117 Heidelberg, Germany 3.Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 5.UJF Grenoble 1, CNRS, INSU, Inst Planetol & Astrophys IPAG,UMR 5274, F-38041 Grenoble 9, France 6.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA 7.Univ Arizona, Lunar & Planetary Lab, Dept Planetary Sci, Tucson, AZ 85721 USA |
| 推荐引用方式 GB/T 7714 | Harvey, Paul M.,Henning, Thomas,Liu, Yao,et al. A HERSCHEL SURVEY OF COLD DUST IN DISKS AROUND BROWN DWARFS AND LOW-MASS STARS[J]. ASTROPHYSICAL JOURNAL,2012,755(1):67(13pp). |
| APA | Harvey, Paul M..,Henning, Thomas.,Liu, Yao.,Menard, Francois.,Pinte, Christophe.,...&Pascucci, Ilaria.(2012).A HERSCHEL SURVEY OF COLD DUST IN DISKS AROUND BROWN DWARFS AND LOW-MASS STARS.ASTROPHYSICAL JOURNAL,755(1),67(13pp). |
| MLA | Harvey, Paul M.,et al."A HERSCHEL SURVEY OF COLD DUST IN DISKS AROUND BROWN DWARFS AND LOW-MASS STARS".ASTROPHYSICAL JOURNAL 755.1(2012):67(13pp). |
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来源：紫金山天文台
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