An extrasolar planet transit search with Subaru Suprime-Cam

Seitaro Urakawa, Toru Yamada, Yasushi Suto, Edwin L. Turner, Yoichi Itoh, Tadashi Mukai, Motohide Tamura, Yiping Wang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We report the results of a prototype photometric search for transiting extrasolar planets using Subaru Suprime-Cam. Out of about 100000 stars monitored around the Galactic plane (l = 90°, b = 0°), we find that 7700 show photometric precision better than 1% for 60 s exposures, which is required to detect extrasolar planets by the transit method. Thus, Suprime-Cam has the photometric stability and accuracy necessary for a transiting planet survey. During this observing run, we detected three objects (around 18.5 mag for i′-band) that exhibit a single full transit-like light curve with a fractional depth of < 5%. While a spectroscopic follow-up remains to be done using future telescopes in the 20-30 m class, the estimated parameters for the three systems are consistent with the planetary size companions around main-sequence stars. We also found two eclipsing binary candidates and eleven variable stars exhibiting W UMa-like light curves.

Original languageEnglish (US)
Pages (from-to)869-881
Number of pages13
JournalPublications of the Astronomical Society of Japan
Issue number5
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Stars: binaries: eclipsing
  • Stars: planetary systems
  • Techniques: photometric


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