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Title: MULTI-COLOR TRANSIT PHOTOMETRY OF GJ 1214b THROUGH BJHK{sub s} BANDS AND A LONG-TERM MONITORING OF THE STELLAR VARIABILITY OF GJ 1214

We present five new transit light curves of GJ 1214b taken in the BJHK{sub s} bands. Two transits were observed in the B band using the Subaru Prime Focus Camera (Suprime-Cam) and the Faint Object Camera and Spectrograph (FOCAS) instruments on board the Subaru 8.2 m telescope, and one transit was done in the JHK{sub s} bands simultaneously with the Simultaneous Infrared Imager for Unbiased Survey (SIRIUS) camera on the Infrared Survey Facility (IRSF) 1.4 m telescope. Markov Chain Monte Carlo analyses show that the planet-to-star radius ratios are R{sub p}/R{sub s} = 0.11651 {+-} 0.00065 (B band, Subaru/Suprime-Cam), R{sub p}/R{sub s} = 0.11601 {+-} 0.00117 (B band, Subaru/FOCAS), R{sub p}/R{sub s} = 0.11654 {+-} 0.00080 (J band, IRSF/SIRIUS), R{sub p}/R{sub s}= 0.11550{sup +0.00142}{sub -0.00153} (H band, IRSF/SIRIUS), and R{sub p}/R{sub s} = 0.11547 {+-} 0.00127 (K{sub s} band, IRSF/SIRIUS). The Subaru Suprime-Cam transit photometry shows a possible spot-crossing feature. Comparisons of the new transit depths and those from previous studies with the theoretical models by Howe and Burrows suggest that the high molecular weight atmosphere (e.g., 1% H{sub 2}O + 99% N{sub 2}) models are most likely, however, the low molecular weight (hydrogen-dominated) atmospheres with extensive clouds are stillmore » not excluded. We also report a long-term monitoring of the stellar brightness variability of GJ 1214 observed with the MITSuME 50 cm telescope in the g', R{sub c}, and I{sub c} bands simultaneously. The monitoring was conducted for 32 nights spanning 78 nights in 2012, and we find a periodic brightness variation with a period of P{sub s} = 44.3 {+-} 1.2 days and semi-amplitudes of 2.1% {+-} 0.4% in the g' band, 0.56% {+-} 0.08% in the R{sub c} band, and 0.32% {+-} 0.04% in the I{sub c} band.« less
Authors:
; ; ; ; ; ;  [1] ; ; ;  [2] ; ; ;  [3] ;  [4] ;  [5] ; ; ; ;  [6] ;  [7] more »; « less
  1. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
  2. Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232 (Japan)
  3. Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113-0033 (Japan)
  4. Department of Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602 (Japan)
  5. Hitotsubashi University, 2-1 Naka, Kunitachi, Tokyo 186-8601 (Japan)
  6. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
  7. Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193 (Japan)
Publication Date:
OSTI Identifier:
22130965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 773; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BRIGHTNESS; CAMERAS; COLOR; HYDROGEN; INFRARED SURVEYS; MARKOV PROCESS; MOLECULAR WEIGHT; MONTE CARLO METHOD; PHOTOMETRY; PLANETS; STARS; TELESCOPES; VISIBLE RADIATION