Near-Infrared Transit Photometry of Extra-Solar Planet HAT-P-54b
- 1 Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, Hyogo, Japan
- 2 Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, Hyogo, Japan
Abstract
The results of near-infrared photometric observations of a transit event of an extrasolar planet HAT-P-54b are presented herein. Precise near-infrared photometry was carried out using the Nayuta 2 m telescope at Nishi-Harima Astronomical Observatory, Japan and Nishi-Harima Infrared Camera (NIC). 170 J- , H- , and Ks -band images were taken in each band in 196 minutes. The flux of the planetary system was observed to decrease during the transit event. While the Ks -band transit depth is similar to that in the r -band, the J - and H -band transits are deeper than those in the Ks -band. We constructed simple models of the planetary atmosphere and found that the observed transit depths are well reproduced by inflated atmosphere containing H 2 S molecule.
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