LOW Mg/Si PLANETARY HOST STARS AND THEIR Mg-DEPLETED TERRESTRIAL PLANETS

被引：34

作者：

Carter-Bond, Jade C. ^{[1
]}

O'Brien, David P. ^{[1
]}

Delgado Mena, Elisa ^{[2
,3
]}

Israelian, Garik ^{[2
,3
]}

Santos, Nuno C. ^{[4
,5
]}

Gonzalez Hernandez, Jonay I. ^{[2
,3
]}

机构：

[1] Planetary Sci Inst, Tucson, AZ 85719 USA

[2] Inst Astrofis Canarias, Tenerife 38200, Spain

[3] Univ La Laguna, Dept Astrofis, Tenerife 38205, Spain

[4] Univ Porto, Ctr Astrofis, P-4150762 Oporto, Portugal

[5] Univ Porto, Dept Fis & Astron, Fac Ciencias, P-4150762 Oporto, Portugal

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 747卷 / 01期

基金：

欧洲研究理事会;

关键词：

planetary systems; planets and satellites: composition; planets and satellites: formation; EXTRASOLAR PLANETS; CHEMICAL ABUNDANCES; OXYGEN ABUNDANCES; PLATE-TECTONICS; HARBORING STARS; GIANT PLANETS; WHITE-DWARFS; PARENT STARS; SYSTEMS; RICH;

D O I：

10.1088/2041-8205/747/1/L2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Simulations have shown that a diverse range of extrasolar terrestrial planet bulk compositions are likely to exist based on the observed variations in host star elemental abundances. Based on recent studies, it is expected that a significant proportion of host stars may have Mg/Si ratios below 1. Here we examine this previously neglected group of systems. Planets simulated as forming within these systems are found to be Mg-depleted (compared to Earth), consisting of silicate species such as pyroxene and various feldspars. Planetary carbon abundances also vary in accordance with the host star C/O ratio. The predicted abundances are in keeping with observations of polluted white dwarfs, lending validity to this approach. Further studies are required to determine the full planetary impacts of the bulk compositions predicted here.

引用

页数：6

共 32 条

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