Elemental abundances of kepler objects of interest in APOGEE. I. Two distinct orbital period regimes inferred from host star iron abundances

Abstract:

The Apache Point Observatory Galactic Evolution Experiment (APOGEE) has observed∼ 600 transiting exoplanets and exoplanet candidates from Kepler (Kepler Objects of Interest, KOIs), most with≥ 18 epochs. The combined multi-epoch spectra are of high signal-to-noise ratio (typically≥ 100) and yield precise stellar parameters and chemical abundances. We first confirm the ability of the APOGEE abundance pipeline, ASPCAP, to derive reliable [Fe/H] and effective temperatures for FGK dwarf stars—the primary Kepler host stellar type—by comparing the ASPCAP-derived stellar parameters with those from independent high-resolution spectroscopic characterizations for 221 dwarf stars in the literature. With a sample of 282 close-in ( days) KOIs observed in the APOGEE KOI goal program, we find a correlation between orbital period and host star [Fe/H] characterized by a critical period, days …

Año de publicación:

2018

Keywords:

Fuente:

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