2014A&A...565A...7C -
Astronomy and Astrophysics, volume 565A, 7-7 (2014/5-1)
Ground-based transit observations of the super-Earth GJ 1214b.
CACERES C., KABATH P., HOYER S., IVANOV V.D., ROJO P., GIRARD J.H., MILLER-RICCI KEMPTON E., FORTNEY J.J. and MINNITI D.
Abstract (from CDS):
GJ1214b is one of the few known transiting super-Earth-sized exoplanets with a measured mass and radius. It orbits an M-dwarf, only 14.55pc away, making it a favorable candidate for follow-up studies. However, the composition of GJ1214b's mysterious atmosphere has yet to be fully unveiled. Our goal is to distinguish between the various proposed atmospheric models to explain the properties of GJ1214b: hydrogen-rich or hydrogen-He mix, or a heavy molecular weight atmosphere with reflecting high clouds, as latest studies have suggested. Wavelength-dependent planetary radii measurements from the transit depths in the optical/NIR are the best tool to investigate the atmosphere of GJ1214b. We present here (i) photometric transit observations with a narrow-band filter centered on 2.14µm and a broad-band I-Bessel filter centered on 0.8665µm, and (ii) transmission spectroscopy in the H and K atmospheric windows that cover three transits. The photometric and spectrophotometric time series obtained were analyzed with MCMC simulations to measure the planetary radii as a function of wavelength. We determined radii ratios of 0.1173–0.0024+0.0022 for I-Bessel and 0.11735–0.00076+0.00072 at 2.14µm. Our measurements indicate a flat transmission spectrum, in agreement with the last atmospheric models that favor featureless spectra with clouds and high molecular weight compositions.
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Journal keyword(s):
planetary systems - techniques: photometric - techniques: spectroscopic - planets and satellites: atmospheres - stars: individual: GJ 1214
VizieR on-line data:
<Available at CDS (J/A+A/565/A7): phot1.dat phot2.dat>
Simbad objects:
3
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