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The super-earth planet GJ 1214b has recently been the focus of severalstudies, using the transit spectroscopy technique, trying to determine thenature of its atmosphere. Here we focus on the Halpha line as a tool to furtherrestrict the nature of GJ1214's atmosphere. We used the Gran TelescopioCanarias (GTC) OSIRIS instrument to acquire narrow band photometry with tunablefilters. With our observations, we were able to observe the primary transit ofthe super-Earth GJ 1214b in three bandpasses: two centered in the continuumaround Halpha (653.5 nm and 662.0 nm) and one centered at the line core (656.3nm). We measure the depth of the planetary transit at each wavelengthinterval.By fitting analytic models to the measured light curves we were ableto compute the depth of the transit at the three bandpasses. Taking thedifference in the computed planet to star radius ratio between the line and thecomparison continuum filters, we find Delta (Rp/Rstar)_{Halpha-653.5} = (6.60+/- 3.54) 10^-3 and Delta (Rp/Rstar)_{Halpha-662.0} = (3.30 +/- 3.61) 10^-3.Although the planet radius is found to be larger in the Halpha line than in thesurrounding continuum, the quality of our observations and the sigma level ofthe differences (1.8 and 1.0, respectively) does not allow us to claim anHalpha excess in GJ1214's atmosphere. Further observations will be needed toresolve this issue.

Narrow Band Halpha Photometry of the Super-Earth GJ 1214b with GTC/OSIRIS Tunable Filters