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Possible signs of water and differentiation in a rocky exoplanetary body
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Farihi, J., Brinkworth, C. S., Gaensicke, B. T., Marsh, T. R., Girven, Jonathan, Hoard, D. W., Klein, B. and Koester, Detlev (2011) Possible signs of water and differentiation in a rocky exoplanetary body. The Astrophysical Journal, Vol.728 (No.1). article no.8. doi:10.1088/2041-8205/728/1/L8 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/2041-8205/728/1/L8
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.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > 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 | ||||
Official Date: | 10 February 2011 | ||||
Dates: |
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Volume: | Vol.728 | ||||
Number: | No.1 | ||||
Page Range: | article no.8 | ||||
DOI: | 10.1088/2041-8205/728/1/L8 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
Data sourced from Thomson Reuters' Web of Knowledge
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