Combining High-Contrast Imaging with Doppler Radial Velocity: a Survey of Subgiant Stars that Exhibit Long-term Linear Trends

Details Combining High-Contrast Imaging with Doppler Radial Velocity: a Survey of Subgiant Stars that Exhibit Long-term Linear Trends Combining High-Contrast Imaging with Doppler Radial Velocity: a Survey of Subgiant Stars that Exhibit Long-term Linear Trends

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542116c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #421.16; Bulletin of the American Astronomical Society, Vol. 42, p.289

Astronomy and Astrophysics

Astronomy

Scientific paper

We are commencing a high-contrast imaging survey at Keck that will target several dozen nearby subgiant stars that show evidence for the existence of a distant companion, as is indicated by a long-term, linear radial velocity (RV) trend. The goal of the survey is to place very tight constraints on the mass and orbit of the body responsible for accelerating each star. Our targets are massive, former A-stars and 28% have a known exoplanet. The typical time baseline for Doppler measurements is 3+ years and a number of targets have minimum periods of 12 years. By combining complementary detection techniques, we will be able to determine with high statistical confidence whether the (outer-most) companion is stellar or substellar in nature for most of the sample. This "inside-out" approach will provide a measure of the occurrence rate of multi-planet systems and brown dwarfs around massive stars. In this poster, we present further motivation on the topic, including several representative RV curves and the anticipated mass, inclination, and semi-major axis constraints imposed by imaging and RV.

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