Kavli Affiliate: Bruce Macintosh
| First 5 Authors: Anne E. Peck, Anne E. Peck, , ,
| Summary:
Directly imaged substellar companions with well-constrained ages and masses
serve as vital empirical benchmarks for planet formation and evolution models.
Potential benchmark companions can be identified from astrometric accelerations
of their host stars. We use Gaia DR3 and Hipparcos astrometry to identify 166
northern hemisphere stars with astrometric accelerations consistent with a
substellar companion between 0.5” and 1”. For this accelerating sample we
identify young stars using APO/ARCES spectra and TESS light curves. From
spectroscopic screening of the sample, we measure ages for 24 stars with
detectable amounts of lithium, place lower age limits on 135 stars with lithium
non-detections, and measure ages from R’HK for 34 stars. 129 stars have TESS
light curves from which we measure ages for 20 stars with rotation rates < 15
days, and we identify 3 eclipsing binaries. We present median ages and
confidence intervals of age posteriors for the entire sample and discuss how
the overall age distribution of our sample compares to a uniform star formation
rate in the solar neighborhood. We identify 47 stars with median ages < 2 Gyr,
31 stars with median ages < 1 Gyr, and 14 stars with median ages < 0.5 Gyr,
making them high-priority targets for direct imaging follow-up.
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