CARBON AND OXYGEN IN NEARBY STARS: KEYS TO PROTOPLANETARY DISK CHEMISTRY

Journal Article · Fri Jul 01 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/735/1/41· OSTI ID:21576539

Petigura, Erik A

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 N{sub C} /N{sub O} , which is thought to play a key role in planet formation. We identify 46 stars with N{sub C} /N{sub O} {>=} 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 disks, supporting the work of Bensby et al. Finally, we measure sub-solar N{sub C} /N{sub O} = 0.40{sup +0.11}{sub -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 N{sub C} /N{sub O} {>=} 1 by Madhusudhan et al. 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 [O I] and C I absorption lines at {lambda} = 6300 and 6587 A using the SME spectral synthesizer.

• OSTI ID: 21576539
• Journal Information: Astrophysical Journal, Vol. 735, Issue 1; Other Information: DOI: 10.1088/0004-637X/735/1/41; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
CARBON
CATALOGS
ELEMENT ABUNDANCE
OXYGEN
PLANETS
PROTOPLANETS
STARS
ABUNDANCE
DOCUMENT TYPES
ELEMENTS
NONMETALS
SORPTION