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The Role of Oxygen Abundances in Exoplanet Host Star C/O Ratios: A Case Study of 55 Cnc

Published online by Cambridge University Press:  06 January 2014

Johanna K. Teske ,
Katia Cunha ,
Verne V. Smith ,
Simon C. Schuler  and
Caitlin A. Griffith
Johanna K. Teske
Affiliation:
Steward Observatory, University of Arizona, email: jteske@as.arizona.edu
Katia Cunha
Affiliation:
Observatório Nacional, Brazil
Verne V. Smith
Affiliation:
National Optical Astronomy Observatory
Simon C. Schuler
Affiliation:
University of Tampa
Caitlin A. Griffith
Affiliation:
Lunar and Planetary Laboratory, University of Arizona
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Abstract

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We derive the C/O ratio for the exoplanet host star 55 Cnc based on archive Keck/HIRES spectra. The C/O ratio varies widely depending on which oxygen abundance indicator – the 6300.3 Å [O I] line, the 6363.8 Å [O I] line, or the 7774 Å O I triplet – is used, and we find there is still a large uncertainty even based on individual abundance indicators. This case study demonstrates that caution and care are necessary when determining exoplanet host star C/O ratios, and when considering host star C/O ratios in inferring exoplanet compositions.

Keywords

planetary systems: formation – stars: abundances – stars: individual (55 Cnc)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 307 - 308
Copyright
Copyright © International Astronomical Union 2013 

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