Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry

Details Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3303p&link_type=abstract

American Astronomical Society, ESS meeting #2, #33.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We present carbon and oxygen abundances for 941 FGK stars--the largest such catalog to date. We find that planet-bearing systems are enriched in these elements. We self-consistently measure NC/NO, which is thought to play a key role in planet formation. We identify 46 stars with NC/NO ≥ 1.00 as potential hosts of carbon-dominated exoplanets. We measure a downward trend in [O/Fe] versus [Fe/H] and find distinct trends in the thin and thick disk, supporting the work of Bensby et al. (2004). Finally, we measure sub-solar NC/NO = 0.40+0.11-0.07 for WASP-12, a surprising result as this star is host to a transiting hot Jupiter whose dayside atmosphere was recently reported to have NC/NO ≥ 1 by Madhusudhan et al. (2011). Our measurements are based on 15,000 high signal-to-noise spectra taken with the Keck 1 telescope as part of the California Planet Search. We derive abundances from the [OI] and CI absorption lines at λ = 630.0 and 658.7 nm using the SME spectral synthesizer.

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