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题名: A SUB-ARCSECOND SURVEY TOWARD CLASS 0 PROTOSTARS IN PERSEUS: SEARCHING FOR SIGNATURES OF PROTOSTELLAR DISKS
作者: Tobin, John J.1, 2; Looney, Leslie W.3; Wilner, David J.4; Kwon, Woojin5; Chandler, Claire J.6; Bourke, Tyler L.4, 7; Loinard, Laurent8; Chiang, Hsin-Fang9, 10; Schnee, Scott1; Chen XuePeng(陈学鹏)11
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-06-01
卷号: 805, 期号:2, 页码:125
关键词: protoplanetary disks ; stars: formation ; stars: protostars ; techniques: interferometric
学科分类: 天文和天体物理
DOI: 10.1088/0004-637X/805/2/125
文章类型: Article
英文摘要: We present a 1.3 mm dust continuum survey toward nine Class 0 protostars and two Class I protostars in the Perseus molecular cloud, using CARMA with a resolution of similar to 0 ''.3 (70 AU). This sample approximately doubles the number of Class 0 protostars observed with spatial resolutions <100 AU at millimeter wavelengths, enabling the presence of large protostellar disks and proto-binary systems to be probed. We have detected flattened structures with radii > 100 AU around two sources (L1448 IRS2 and Per-emb-14), and these sources may be strong disk candidates. Marginally resolved structures within 30 degrees of perpendicular to the outflow are found toward three protostars (L1448 IRS3C, IRAS 03282+3035, L1448C) and are considered disk candidates. Two others (L1448 IRS3B, IRAS 03292+3039) have complex resolved structures, possibly indicative of massive, fragmenting inner envelopes or disks; L1448 IRS3B also has evidence for a companion separated by 0 ''.9 (similar to 210 AU). The candidate first hydrostatic core L1451-MMS is marginally resolved on 1 '' scales and the Class 0 protostar IC 348-MMS and does not have strong indications of resolved structure at any scale. The strong disk candidate sources were followed up with (CO)-O-18 (J = 2 -> 1) observations; we detect velocity gradients that are consistent with the expected rotation axis, but without enough sensitivity to determine if it is Keplerian. We compare the observed visibility amplitudes to radiative transfer models of protostellar envelopes and disks. The visibility amplitude ratios show that a compact component (possibly a disk) is necessary for five of nine Class 0 sources. An envelope-only scenario cannot be ruled out for the other four Class 0 sources. We conclude that there is evidence for the formation of large disks in the Class 0 phase, but Class 0 disks likely have a range of radii and masses that depend on the initial conditions of their parent cores.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SPITZER C2D SURVEY ; MAGNETIC BRAKING CATASTROPHE ; STAR-FORMING REGIONS ; 1ST HYDROSTATIC CORE ; NEARBY DENSE CORES ; CIRCUMSTELLAR DISKS ; CONTINUUM OBSERVATIONS ; YOUNGEST PROTOSTARS ; KEPLERIAN DISK ; BINARY-SYSTEMS
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000356715400040
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14823
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.Natl Radio Astron Observ, Charlottesville, VA 22903 USA
2.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
3.Univ Illinois, Dept Astron, Urbana, IL 61801 USA
4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
5.SRON Netherlands Inst Space Res, NL-9747 AD Groningen, Netherlands
6.Natl Radio Astron Observ, Socorro, NM 87801 USA
7.Jodrell Bank, Macclesfield, Cheshire, England
8.UNAM, Ctr Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico
9.Univ Hawaii Manoa, Inst Astron, Hilo, HI 96720 USA
10.Univ Hawaii Manoa, NASA Astrobiol Inst, Hilo, HI 96720 USA
11.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
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