Forming the first planetary systems: debris around Galactic thick disc stars

  title={Forming the first planetary systems: debris around Galactic thick disc stars},
  author={C. K. W. Sheehan and Jane Greaves and Geoffrey C. Bryden and George H. Rieke and Kate Y. L. Su and Mark C. Wyatt and Charles A. Beichman},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
The thick disc contains stars formed within the first Gyr of Galactic history, and little is known about their planetary systems. The Spitzer MIPS instrument was used to search 11 of the closest of these old low-metal stars for circumstellar debris, as a signpost that bodies at least as large as planetesimals were formed. A total of 22 thick disc stars has now been observed, after including archival data, but dust is not found in any of the systems. The data rule out a high incidence of debris… 
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