The role of oxygen abundances in exoplanet host star C/O ratios: A case study of 55 Cnc

Johanna K. Teske, Katia Cunha, Verne V. Smith, Simon C. Schuler, Caitlin A. Griffith

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationExploring the Formation and Evolution of Planetary Systems
PublisherCambridge University Press
Number of pages2
ISBN (Print)9781107045200
StatePublished - Jun 2013

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • Planetary systems: formation
  • Stars: abundances
  • Stars: individual (55 Cnc)

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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