Possible signs of water and differentiation in a rocky exoplanetary body
Farihi, J., Brinkworth, C. S., Gaensicke, B. T. (Boris T.), Marsh, T. R., Girven, Jonathan, Hoard, D. W. (Donald Wayne), Klein, B. and Koester, Detlev, 1941-. (2011) Possible signs of water and differentiation in a rocky exoplanetary body. The Astrophysical Journal, Vol.728 (No.1). article no.8. ISSN 0004-637XFull text not available from this repository.
Official URL: http://dx.doi.org/10.1088/2041-8205/728/1/L8
Spitzer observations reveal the presence of warm debris from a tidally destroyed rocky and possibly icy planetary body orbiting the white dwarf GD 61. Ultraviolet and optical spectroscopy of the metal-contaminated stellar photosphere reveal traces of hydrogen, oxygen, magnesium, silicon, iron, and calcium. The nominal ratios of these elements indicate an excess of oxygen relative to that expected from rock-forming metal oxides, and thus it is possible that water was accreted together with the terrestrial-like debris. Iron is found to be deficient relative to magnesium and silicon, suggesting the material may have originated as the outer layers of a differentiated parent body, as is widely accepted for the Moon.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Faculty of Science > Physics|
|Library of Congress Subject Headings (LCSH):||Circumstellar matter, Asteroids, Cosmic abundances, White dwarf stars|
|Journal or Publication Title:||The Astrophysical Journal|
|Publisher:||Institute of Physics Publishing, Inc.|
|Official Date:||10 February 2011|
|Page Range:||article no.8|
|Access rights to Published version:||Restricted or Subscription Access|
Basaltic Volcanism Study Project 1981, Basaltic Volcanism on the Terrestrial
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