The Role of Oxygen Abundances in Exoplanet Host Star C/O Ratios: A Case Study of 55 Cnc
Abstract
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.
- Publication:
-
Exploring the Formation and Evolution of Planetary Systems
- Pub Date:
- January 2014
- DOI:
- 10.1017/S1743921313008727
- Bibcode:
- 2014IAUS..299..307T
- Keywords:
-
- planetary systems: formation;
- stars: abundances;
- stars: individual (55 Cnc)