干旱区生态环境知识资源中心(Arid): Constraints on Planetesimal Accretion Inferred from Particle-size Distribution in CO Chondrites

Arid

DOI	10.3847/2041-8213/ac17f2
	Constraints on Planetesimal Accretion Inferred from Particle-size Distribution in CO Chondrites
	Pinto, Gabriel A.; Marrocchi, Yves; Morbidelli, Alessandro; Charnoz, Sebastien; Eugenia Varela, Maria; Soto, Kevin; Martinez, Rodrigo; Olivares, Felipe
通讯作者	Pinto, GA (corresponding author), Univ Lorraine, UMR 7358, CRPG, CNRS, F-54501 Vandoeuvre Les Nancy, France. ; Pinto, GA (corresponding author), Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo, Chile.
来源期刊	ASTROPHYSICAL JOURNAL LETTERS
ISSN	2041-8205
EISSN	2041-8213
出版年	2021
卷号	917 期号:2
英文摘要	The formation of planetesimals was a key step in the assemblage of planetary bodies, yet many aspects of their formation remain poorly constrained. Notably, the mechanism by which chondrules-submillimetric spheroids that dominate primitive meteorites-were incorporated into planetesimals remains poorly understood. Here we classify and analyze particle-size distributions in various CO carbonaceous chondrites found in the Atacama Desert. Our results show that the average circle-equivalent diameters of chondrules define a positive trend with the petrographic grade, which reflects the progressive role of thermal metamorphism within the CO parent body. We show that this relationship could not have been established by thermal metamorphism alone but rather by aerodynamic sorting during accretion. By modeling the self-gravitational contraction of clumps of chondrules, we show that (i) the accretion of the CO parent body(ies) would have generated a gradual change of chondrule size with depth in the parent body, with larger chondrules being more centrally concentrated than smaller ones, and (ii) any subsequent growth by pebble accretion would have been insignificant. These findings give substantial support to the view that planetesimals formed via gravitational collapse.
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000686365800001
WOS关键词	METAMORPHISM ; CHONDRULES ; OXYGEN ; SIMULATIONS ; HISTORY ; ORIGIN ; CV
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/2XILL650/362622
作者单位	[Pinto, Gabriel A.; Marrocchi, Yves] Univ Lorraine, UMR 7358, CRPG, CNRS, F-54501 Vandoeuvre Les Nancy, France; [Pinto, Gabriel A.; Olivares, Felipe] Univ Atacama, Inst Astron & Ciencias Planetarias, Copayapu 485, Copiapo, Chile; [Morbidelli, Alessandro] Univ Nice Sophia Antipolis, Observ Cote dAzur, Lab Lagrange, UMR7293,CNRS, Blvd Observ, F-06304 Nice 4, France; [Charnoz, Sebastien] Univ Paris, Inst Phys Globe Paris, CNRS, F-75005 Paris, France; [Eugenia Varela, Maria] ICATE CONICET, Inst Ciencias Astron Tierra & Espacio, San Juan, Argentina; [Soto, Kevin] Univ Austral Chile, Fac Ciencias, Inst Ciencias Tierra, Valdivia, Chile; [Martinez, Rodrigo] Museo Meteorito, San Pedro De Atacama, Chile
推荐引用方式 GB/T 7714	Pinto, Gabriel A.,Marrocchi, Yves,Morbidelli, Alessandro,et al. Constraints on Planetesimal Accretion Inferred from Particle-size Distribution in CO Chondrites[J],2021,917(2).
APA	Pinto, Gabriel A..,Marrocchi, Yves.,Morbidelli, Alessandro.,Charnoz, Sebastien.,Eugenia Varela, Maria.,...&Olivares, Felipe.(2021).Constraints on Planetesimal Accretion Inferred from Particle-size Distribution in CO Chondrites.ASTROPHYSICAL JOURNAL LETTERS,917(2).
MLA	Pinto, Gabriel A.,et al."Constraints on Planetesimal Accretion Inferred from Particle-size Distribution in CO Chondrites".ASTROPHYSICAL JOURNAL LETTERS 917.2(2021).