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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Carter Bond, JC (Author) Other; O'Brien, DP (Author) Other; Delgado Mena, ED (Author) FCUP; Israelian, G (Author) Other; N.C. Santos (Author) FCUP; Gonzalez Hernandez, JIG (Author) Other

Journal

Title: Astrophysical Journal Letters

Vol. 747

Final page: L2

ISSN: 2041-8205

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 34 Citations

Scopus - 34 Citations

Other information

Authenticus ID: P-002-CM5

DOI: 10.1088/2041-8205/747/1/l2

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6