Farihi, J., Brinkworth, C. S., Gänsicke, 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 0004-637X

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Abstract

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.

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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.
ISSN:	0004-637X
Date:	10 February 2011
Volume:	Vol.728
Number:	No.1
Page Range:	article no.8
Identification Number:	10.1088/2041-8205/728/1/L8
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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URI:	http://wrap.warwick.ac.uk/id/eprint/39764

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