OTS 44: Disk and accretion at the planetary border
文献类型：期刊论文
| 作者 | Joergens, V.1,2; Bonnefoy, M.1; Liu, Y.3,4,5 ; Bayo, A.1,6; Wolf, S.5; Chauvin, G.7; Rojo, P.8
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2013-10-01 |
| 卷号 | 558页码:L7 |
| 关键词 | brown dwarfs stars: pre-main sequence circumstellar matter accretion, accretion disks stars: formation stars: individual: OTS 44 |
| ISSN号 | 0004-6361 |
| 通讯作者 | Joergens, V. (Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany) |
| 英文摘要 | We discover that the very low-mass brown dwarf OTS 44 (M9.5, similar to 12 M-Jup) has significant accretion and a substantial disk, which demonstrates that the processes that accompany canonical star formation occur down to a central mass of a few Jupiter masses. We discover in VLT/SINFONI spectra that OTS 44 has strong, broad, and variable Pa beta emission that is evidence for active accretion at the planetary border. We also detect strong Ha emission of OTS 44 in a literature spectrum and determine an Ha EW of -141 angstrom, which indicates active accretion. Both the Pa beta and H alpha emission lines have broad profiles with wings extending to velocities of about +/- 200 km s(-1). We determine the mass accretion rate of OTS 44 based on H alpha to 7.6 x 10(-12) M-circle dot yr(-1). This result shows that OTS 44 has a relatively high mass-accretion rate considering its small central mass. This mass rate is nevertheless consistent with the general decreasing trend found for stars of several solar masses down to brown dwarfs. Furthermore, we determine the properties of the disk surrounding OTS 44 through radiative transfer modeling of flux measurement from the optical to the far-IR (Herschel) by applying a Bayesian analysis. We find that OTS 44 has a highly flared disk (beta > 1.2) with a mass of 9.1(-5.5)(+1.7) x 10(-5) M-circle dot, i.e. similar to 0.1 M-Jup or 30 M-Earth. We show that the ratio of the disk-to-central-mass of about 10(-2) found for objects between 0.03 M-circle dot and 14 M-circle dot is also valid for OTS 44 at a mass of similar to 0.01 M-circle dot. Our observations are in line with an isolated star-like mode of the formation of brown dwarfs down to 0.01 M-circle dot. |
| 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] | LOW-MASS STARS ; T-TAURI STARS ; X-SHOOTER OBSERVATIONS ; BROWN DWARF FORMATION ; CHAMELEON-I ; CIRCUMSTELLAR DISK ; FORMING REGION ; MOLECULAR OUTFLOW ; COLLINDER 69 ; YOUNG STARS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000326574000158 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9845]  |
| 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.Max Planck Inst Astron, D-69117 Heidelberg, Germany 2.Heidelberg Univ, Zentrum Astron, Inst Theor Astrophys, D-69120 Heidelberg, Germany 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 5.Univ Kiel, Inst Theoret Phys & Astrophys, D-24118 Kiel, Germany 6.European So Observ, Santiago 19, Chile 7.Inst Planetol & Astrophys Grenoble, F-38400 St Martin Dheres, France 8.Univ Chile, Dept Astron, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Joergens, V.,Bonnefoy, M.,Liu, Y.,et al. OTS 44: Disk and accretion at the planetary border[J]. ASTRONOMY & ASTROPHYSICS,2013,558:L7. |
| APA | Joergens, V..,Bonnefoy, M..,Liu, Y..,Bayo, A..,Wolf, S..,...&Rojo, P..(2013).OTS 44: Disk and accretion at the planetary border.ASTRONOMY & ASTROPHYSICS,558,L7. |
| MLA | Joergens, V.,et al."OTS 44: Disk and accretion at the planetary border".ASTRONOMY & ASTROPHYSICS 558(2013):L7. |
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来源：紫金山天文台
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