Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917904w&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #179.04; Bulletin of the American Astronomical Society,
Other
1
Scientific paper
I have characterized the orbits of over 100 exoplanets using precision radial velocity (RV) measurements from the California & Carnegie and Anglo-Australian Planet Searches. I have measured stellar magnetic activity in 1200 Planet Search program stars using the chromospheric Ca II H and K emission cores from the same spectra used to make precision RV measurements. I have reduced these data to Mount Wilson S indices and used the canonical age-activity relation to derive ages for these stars.
I find that this age-activity relation breaks down for very inactive and slightly evolved stars, and yields erroneously large ages for subgiants because it ignores the effects of evolution and abundance. This miscalibration has resulted in some confusion over the nature of some evolved stars, leading to their misclassification in the literature as examples of stars in extraordinary states of inactivity analogous to the solar Maunder Minimum.
I have analyzed the Keck RV data to determine the magnitude of astrophysical and instrumental RV noise, ``jitter'', as a function of color, activity level, and evolution. I quantify the increase in jitter with activity and decrease in B-V.
I have used this jitter estimate to recalculate the orbits of 100 previously known exoplanets, updating their orbital parameters and error estimates. I have combined this with data on all other known nearby exoplanets to create the Catalog of Nearby Exoplanets, containing stellar properties, orbital parameters, RV, and references for all 172 known exoplanets, including 5 previously unreported planets.
I have also used the jitter formula to measure false alarm probabilities for the existence of additional companions orbiting planet-bearing stars, and discuss constraining the orbital parameters of planets with incomplete orbits.
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