Abstract / Description of output
We present results from the first three years of observations of moving group (MG) targets in the Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) high-contrast imaging survey of exoplanets and disks using the Subaru telescope. We achieve typical contrasts of similar to 10(5) at 1 '' and similar to 10(6) beyond 2 '' around 63 proposed members of nearby kinematic MGs. We review each of the kinematic associations to which our targets belong, concluding that five, beta Pictoris (similar to 20 Myr), AB Doradus (similar to 100 Myr), Columba (similar to 30 Myr), Tucana-Horogium (similar to 30 Myr), and TW Hydrae (similar to 10 Myr), are sufficiently well-defined to constrain the ages of individual targets. Somewhat less than half of our targets are high-probability members of one of these MGs. For all of our targets, we combine proposed MG membership with other age indicators where available, including Ca II HK emission, X-ray activity, and rotation period, to produce a posterior probability distribution of age. SEEDS observations discovered a substellar companion to one of our targets,. And, a late B star. We do not detect any other substellar companions, but do find seven new close binary systems, of which one still needs to be confirmed. A detailed analysis of the statistics of this sample, and of the companion mass constraints given our age probability distributions and exoplanet cooling models, will be presented in a forthcoming paper.
Original language | English |
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Article number | 1 |
Number of pages | 25 |
Journal | Astrophysical Journal |
Volume | 786 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 May 2014 |
Keywords / Materials (for Non-textual outputs)
- binaries: close
- brown dwarfs
- open clusters and associations: general
- stars: activity
- stars: imaging
- stars: low-mass
- stars: planetary systems
- TW-HYDRAE ASSOCIATION
- LATE-TYPE STARS
- LOW-MASS STARS
- MAIN-SEQUENCE STARS
- STELLAR KINEMATIC GROUPS
- YOUNG SOLAR ANALOGS
- ALL-SKY SURVEY
- EXTRASOLAR GIANT PLANETS
- GENEVA-COPENHAGEN SURVEY
- ADAPTIVE OPTICS SURVEY