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Title: The moving group targets of the seeds high-contrast imaging survey of exoplanets and disks: Results and observations from the first three years

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 ∼10{sup 5} at 1'' and ∼10{sup 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, β Pictoris (∼20 Myr), AB Doradus (∼100 Myr), Columba (∼30 Myr), Tucana-Horogium (∼30 Myr), and TW Hydrae (∼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, κ 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 ofmore » this sample, and of the companion mass constraints given our age probability distributions and exoplanet cooling models, will be presented in a forthcoming paper.« less
Authors:
; ; ;  [1] ;  [2] ;  [3] ; ; ; ; ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] more »; « less
  1. Department of Astrophysical Sciences, Princeton University, Princeton, NJ (United States)
  2. Tokyo Institute of Technology, Tokyo (Japan)
  3. Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  4. Max Planck Institute for Astronomy, Heidelberg (Germany)
  5. HL Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK (United States)
  6. Department of Astronomy, Kyoto University, Kyoto (Japan)
  7. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  8. Department of Astrophysics, CAB-CSIC/INTA, Madrid (Spain)
  9. Astronomical Institute Anton Pannekoek, University of Amsterdam, Amsterdam (Netherlands)
  10. Subaru Telescope, Hilo, HI (United States)
  11. National Astronomical Observatory of Japan, Tokyo (Japan)
  12. Laboratoire Hippolyte Fizeau, Nice (France)
Publication Date:
OSTI Identifier:
22357049
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 786; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COOLING; DISTRIBUTION; EMISSION; EXPLORATION; LIMITING VALUES; MAGNESIUM SULFIDES; MASS; PROBABILITY; ROTATION; STARS; STATISTICS; TELESCOPES; X RADIATION