Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1093/mnras/stx725 |
Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity | |
Guszejnov, David1; Hopkins, Philip F.1; Krumholz, Mark R.2 | |
通讯作者 | Guszejnov, David |
来源期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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ISSN | 0035-8711 |
EISSN | 1365-2966 |
出版年 | 2017 |
卷号 | 468期号:4页码:4093-4106 |
英文摘要 | Stars are strongly clustered on both large (similar to pc) and small (similar to binary) scales, but there are few analytic or even semi-analytic theories for the correlation function and multiplicity of stars. In this paper, we present such a theory, based on our recently developed semi-analytic framework called MISFIT (Minimalistic Star Formation Including Turbulence), which models gravito-turbulent fragmentation, including the suppression of fragmentation by protostellar radiation feedback. We compare the results including feedback to a control model in which it is omitted. We show that both classes of models robustly reproduce the stellar correlation function at >0.01 pc scales, which is well approximated by a power law that follows generally from scale-free physics (turbulence plus gravity) on large scales. On smaller scales, protostellar disc fragmentation becomes dominant over common core fragmentation, leading to a steepening of the correlation function. Multiplicity is more sensitive to feedback: we found that a model with the protostellar heating reproduces the observed multiplicity fractions and mass ratio distributions for both Solar and sub-Solar mass stars (in particular, the brown dwarf desert), while a model without feedback fails to do so. The model with feedback also produces an at-formation period distribution consistent with the one inferred from observations. However, it is unable to produce short-range binaries below the length-scale of protostellar discs. We suggest that such close binaries are produced primarily by disc fragmentation and further decrease their separation through orbital decay. |
英文关键词 | turbulence binaries: general stars: formation galaxies: star clusters: general galaxies: star formation cosmology: theory |
类型 | Article |
语种 | 英语 |
国家 | USA ; Australia |
收录类别 | SCI-E |
WOS记录号 | WOS:000402819700027 |
WOS关键词 | MOLECULAR CLOUD CORES ; STAR-FORMATION ; BROWN DWARF ; ORBITAL DECAY ; MASS ; DISTRIBUTIONS ; SIMULATIONS ; COLLAPSE ; DENSITY ; SYSTEMS |
WOS类目 | Astronomy & Astrophysics |
WOS研究方向 | Astronomy & Astrophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/201167 |
作者单位 | 1.CALTECH, TAPIR, MC 350-17, Pasadena, CA 91125 USA; 2.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia |
推荐引用方式 GB/T 7714 | Guszejnov, David,Hopkins, Philip F.,Krumholz, Mark R.. Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity[J],2017,468(4):4093-4106. |
APA | Guszejnov, David,Hopkins, Philip F.,&Krumholz, Mark R..(2017).Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,468(4),4093-4106. |
MLA | Guszejnov, David,et al."Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 468.4(2017):4093-4106. |
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