中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 行星科学与深空探测实验室  > 期刊论文
题名: Compositional Imprints in Density-Distance-Time: A Rocky Composition for Close-in Low-mass Exoplanets from the Location of the Valley of Evaporation
作者: Jin, Sheng; Mordasini, Christoph
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2018
卷号: 853, 期号:2, 页码:163
英文摘要: We use an end-to-end model of planet formation, thermodynamic evolution, and atmospheric escape to investigate how the statistical imprints of evaporation depend on the bulk composition of planetary cores (rocky versus icy). We find that the population-wide imprints like the location of the "evaporation valley" in the distance-radius plane and the corresponding bimodal radius distribution clearly differ depending on the bulk composition of the cores. Comparison with the observed position of the valley suggests that close-in low-mass Kepler planets have a predominantly Earth-like rocky composition. Combined with the excess of period ratios outside of MMR, this suggests that low-mass Kepler planets formed inside of the water iceline but were still undergoing orbital migration. The core radius becomes visible for planets losing all primordial H/He. For planets in this " triangle of evaporation" in the distance-radius plane, the degeneracy in composition is reduced. In the observed planetary mass-mean density diagram, we identify a trend to more volatile-rich compositions with an increasing radius (R/R-circle plus less than or similar to 1.6 rocky; 1.6-3.0 ices, and/or H/He; greater than or similar to 3: H/He). The mass-density diagram contains important information about formation and evolution. Its characteristic broken V-shape reveals the transitions from solid planets to low-mass core-dominated planets with H/He and finally to gas-dominated giants. Evaporation causes the density and orbital distance to be anticorrelated for low-mass planets in contrast to giants, where closer-in planets are less dense, likely due to inflation. The temporal evolution of the statistical properties reported here will be of interest for the PLATO 2.0 mission, which will observe the temporal dimension.
语种: 英语
WOS记录号: WOS:000424011300024
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18006
Appears in Collections:行星科学与深空探测实验室_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
2018024.pdf(3033KB)期刊论文作者接受稿限制开放View 联系获取全文
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Jin, Sheng]'s Articles
[Mordasini, Christoph]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Jin, Sheng]‘s Articles
[Mordasini, Christoph]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: 2018024.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院紫金山天文台 - Feedback
Powered by CSpace