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题名: Herschel/PACS view of disks around low-mass stars and brown dwarfs in the TW Hydrae association
作者: Liu Yao(刘尧)1, 2; Herczeg, Gregory J.3; Gong, Munan4, 5; Allers, Katelyn N.6; Brown, Joanna M.7; Kraus, Adam L.8; Liu, Michael C.9; Shkolnik, Evgenya L.10; van Dishoeck, Ewine F.11, 12
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2015
卷号: 573, 页码:A63
关键词: stars: low-mass ; circumstellar matter ; brown dwarfs ; protoplanetary disks
学科分类: 天文和天体物理
DOI: 10.1051/0004-6361/201424721
文章类型: Article
英文摘要: We conducted Herschel/PACS observations of five very low-mass stars or brown dwarfs located in the TW Hya association with the goal of characterizing the properties of disks in the low stellar mass regime. We detected all five targets at 70 mu m and 100 mu m and three targets at 160 mu m. Our observations, combined with previous photometry from 2MASS, WISE, and SCUBA-2, enabled us to construct spectral energy distributions (SEDs) with extended wavelength coverage. Using sophisticated radiative transfer models, we analyzed the observed SEDs of the five detected objects with a hybrid fitting strategy that combines the model grids and the simulated annealing algorithm and evaluated the constraints on the disk properties via the Bayesian inference method. The modeling suggests that disks around low-mass stars and brown dwarfs are generally flatter than their higher mass counterparts, but the range of disk mass extends to well below the value found in T Tauri stars, and the disk scale heights are comparable in both groups. The inferred disk properties (i.e., disk mass, flaring, and scale height) in the low stellar mass regime are consistent with previous findings from large samples of brown dwarfs and very low-mass stars. We discuss the dependence of disk properties on their host stellar parameters and find a significant correlation between the Herschel far-IR fluxes and the stellar effective temperatures, probably indicating that the scaling between the stellar and disk masses (i.e., M-disk proportional to M-star) observed mainly in low-mass stars may extend down to the brown dwarf regime.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SPECTRAL ENERGY-DISTRIBUTIONS ; INTERSTELLAR SILICATE MINERALOGY ; CIRCUMSTELLAR DUST DISKS ; YOUNG SUBSTELLAR OBJECTS ; GOULD BELT SURVEY ; PROTOPLANETARY DISKS ; RADIATIVE-TRANSFER ; RHO-OPHIUCHI ; EVOLUTIONARY MODELS ; STELLAR OBJECTS
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000346901300076
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14802
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
4.Tsinghua Univ, Beijing 100084, Peoples R China
5.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
6.Bucknell Univ, Dept Phys & Astron, Lewisburg, PA 17837 USA
7.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
8.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
9.Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA
10.Lowell Observ, Flagstaff, AZ 86001 USA
11.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
12.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
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