SMA OBSERVATIONS OF CLASS 0 PROTOSTARS: A HIGH ANGULAR RESOLUTION SURVEY OF PROTOSTELLAR BINARY SYSTEMS
文献类型：期刊论文
| 作者 | Chen, Xuepeng1,2 ; Arce, Hector G.2; Zhang, Qizhou3; Bourke, Tyler L.3; Launhardt, Ralf4; Jorgensen, Jes K.5,6; Lee, Chin-Fei7; Foster, Jonathan B.8; Dunham, Michael M.2; Pineda, Jaime E.9,10
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-05-10 |
| 卷号 | 768期号:2页码:0 |
| 关键词 | binaries: general dust, extinction ISM: clouds stars: formation techniques: interferometric |
| ISSN号 | 0004-637X |
| 通讯作者 | Chen, XP (reprint author), Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China. Email: xpchen@pmo.ac.cn |
| 英文摘要 | We present high angular resolution 1.3 mm and 850 mu m dust continuum data obtained with the Submillimeter Array toward 33 Class 0 protostars in nearby clouds (distance < 500 pc), which represents so far the largest survey toward protostellar binary/multiple systems. The median angular resolution in the survey is 2 ''.5, while the median linear resolution is approximately 600 AU. Compact dust continuum emission is observed from all sources in the sample. Twenty-one sources in the sample show signatures of binarity/multiplicity, with separations ranging from 50 AU to 5000 AU. The numbers of singles, binaries, triples, and quadruples in the sample are 12, 14, 5, and 2, respectively. The derived multiplicity frequency (MF) and companion star fraction (CSF) for Class 0 protostars are 0.64 +/- 0.08 and 0.91 +/- 0.05, respectively, with no correction for completeness. The derived MF and CSF in this survey are approximately two times higher than the values found in the binary surveys toward Class I young stellar objects, and approximately three (for MF) and four (for CSF) times larger than the values found among main-sequence stars, with a similar range of separations. Furthermore, the observed fraction of high-order multiple systems to binary systems in Class 0 protostars (0.50 +/- 0.09) is also larger than the fractions found in Class I young stellar objects (0.31 +/- 0.07) and main-sequence stars (<= 0.2). These results suggest that binary properties evolve as protostars evolve, as predicted by numerical simulations. The distribution of separations for Class 0 protostellar binary/multiple systems shows a general trend in which CSF increases with decreasing companion separation. We find that 67% +/- 8% of the protobinary systems have circumstellar mass ratios below 0.5, implying that unequal-mass systems are preferred in the process of binary star formation. We suggest an empirical sequential fragmentation picture for binary star formation, based on this work and existing lower resolution single-dish observations. |
| 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] | STAR-FORMING REGIONS ; SPITZER C2D SURVEY ; INITIAL MASS FUNCTION ; MAIN-SEQUENCE STARS ; NEARBY DENSE CORES ; SUBMILLIMETER CONTINUUM OBSERVATIONS ; QUADRUPOLAR MOLECULAR OUTFLOW ; 1ST HYDROSTATIC CORE ; BARNARD-1 DARK CLOUD ; SOLAR-TYPE STARS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000318228400013 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9841]  |
| 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.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Yale Univ, Dept Astron, New Haven, CT 06520 USA 3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 4.Max Planck Inst Astron, D-69117 Heidelberg, Germany 5.Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark 6.Univ Copenhagen, Ctr Star & Planet Format, DK-2100 Copenhagen O, Denmark 7.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan 8.Boston Univ, Inst Astrophys Res, Boston, MA 02215 USA 9.ESO, D-85748 Garching, Germany 10.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England |
| 推荐引用方式 GB/T 7714 | Chen, Xuepeng,Arce, Hector G.,Zhang, Qizhou,et al. SMA OBSERVATIONS OF CLASS 0 PROTOSTARS: A HIGH ANGULAR RESOLUTION SURVEY OF PROTOSTELLAR BINARY SYSTEMS[J]. ASTROPHYSICAL JOURNAL,2013,768(2):0. |
| APA | Chen, Xuepeng.,Arce, Hector G..,Zhang, Qizhou.,Bourke, Tyler L..,Launhardt, Ralf.,...&Henning, Thomas.(2013).SMA OBSERVATIONS OF CLASS 0 PROTOSTARS: A HIGH ANGULAR RESOLUTION SURVEY OF PROTOSTELLAR BINARY SYSTEMS.ASTROPHYSICAL JOURNAL,768(2),0. |
| MLA | Chen, Xuepeng,et al."SMA OBSERVATIONS OF CLASS 0 PROTOSTARS: A HIGH ANGULAR RESOLUTION SURVEY OF PROTOSTELLAR BINARY SYSTEMS".ASTROPHYSICAL JOURNAL 768.2(2013):0. |
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来源：紫金山天文台
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