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

Timothy D. Brandt, Masayuki Kuzuhara, Michael W. McElwain, Joshua E. Schlieder, John P. Wisniewski, Edwin L. Turner, J. Carson, T. Matsuo, B. Biller, M. Bonnefoy, C. Dressing, M. Janson, G. R. Knapp, A. Moro-Martín, C. Thalmann, T. Kudo, N. Kusakabe, J. Hashimoto, L. Abe, W. BrandnerT. Currie, S. Egner, M. Feldt, T. Golota, M. Goto, C. A. Grady, O. Guyon, Y. Hayano, M. Hayashi, S. Hayashi, T. Henning, K. W. Hodapp, M. Ishii, M. Iye, R. Kandori, J. Kwon, K. Mede, S. Miyama, J. I. Morino, T. Nishimura, T. S. Pyo, E. Serabyn, T. Suenaga, H. Suto, R. Suzuki, M. Takami, Y. Takahashi, N. Takato, H. Terada, D. Tomono, M. Watanabe, T. Yamada, H. Takami, T. Usuda, M. Tamura

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

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 105 at 1″ and 106 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 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 languageEnglish
Article number1
JournalAstrophysical Journal
Volume786
Issue number1
DOIs
Publication statusPublished - 2014 May 1

Keywords

  • binaries: close
  • brown dwarfs
  • open clusters and associations: general
  • stars: activity
  • stars: imaging
  • stars: low-mass
  • stars: planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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