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Title:
An Extrasolar Planet Transit Search with Subaru Suprime-Cam
Authors:
Urakawa, Seitaro; Yamada, Toru; Suto, Yasushi; Turner, Edwin L.; Itoh, Yoichi; Mukai, Tadashi; Tamura, Motohide; Wang, Yiping
Affiliation:
AA(Bisei Spaceguard Center, 1716-3 Okura, Bisei-cho, Ibara, Okayama 714-1411; Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501; ) AB(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588; ) AC(Department of Physics, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033; ) AD(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544, USA; ) AE(Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501; ) AF(Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501; ) AG(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588; ) AH(Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China; )
Publication:
Publications of the Astronomical Society of Japan, Vol.58, No.5, pp.869-881 (PASJ Homepage)
Publication Date:
10/2006
Origin:
PASJ
Keywords:
stars: binaries: eclipsing -- stars: planetary systems -- techniques: photometric
Bibliographic Code:
2006PASJ...58..869U

Abstract

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 60s 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 18.5mag 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 20-30m 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.
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