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Observational evidence for a metal rich atmosphere on the super-Earth GJ1214b by Désert, Jean-Michel; Bean, Jacob; Kempton, Eliza Miller-Ricci; Berta, Zachory K.; Charbonneau, David; Irwin, Jonathan; Fortney, Jonathan J.; Burke, Christopher J.; Nutzman, Philip is a scholarly article available to read on EtoBox.

What is Observational evidence for a metal rich atmosphere on the super-Earth GJ1214b about?

We report observations of two consecutive transits of the warm super-Earth exoplanet GJ1214b at 3.6 and 4.5 microns with the Infrared Array Camera instrument on-board the Spitzer Space Telescope. The two transit light curves allow for the determination of the transit parameters for this system. We find these paremeters to be consistent with the previously determined values and no evidence for transit timing variations. The main investigation consists of measuring the transit depths in each bandpass to constrain the planet's transmission spectrum. Fixing the system scale and impact parameters, we measure R_p/R_star=0.1176 (+0.0008/-0.0009) and 0.1163 (+0.0010/-0.0008) at 3.6 and 4.5 microns, respectively. Combining these data with the previously reported MEarth Observatory measurements in the red optical yields constraints on the GJ1214b's transmission spectrum and allows us to rule-out a cloud-free, solar composition (i.e., hydrogen-dominated) atmosphere at 4.5 sigma confidence. This independently confirms a recent finding that was based on a measurement of the planet's transmission spectrum using the VLT. The Spitzer, MEarth, and VLT observations together yield a remarkably flat t

Author

Désert, Jean-Michel; Bean, Jacob; Kempton, Eliza Miller-Ricci; Berta, Zachory K.; Charbonneau, David; Irwin, Jonathan; Fortney, Jonathan J.; Burke, Christopher J.; Nutzman, Philip

Published

2011

Language

EN