BROADBAND TRANSMISSION SPECTROSCOPY OF THE SUPER-EARTH GJ 1214b SUGGESTS A LOW MEAN MOLECULAR WEIGHT ATMOSPHERE
作者： Bryce Croll , Loic Albert , Ray Jayawardhana , Eliza Miller-Ricci Kempton , Jonathan J. Fortney
DOI: 10.1088/0004-637X/736/2/78
关键词: Absorption (logic) 、 Infrared 、 Super-Earth 、 Stars 、 Astrophysics 、 Transit (astronomy) 、 Physics 、 Spectroscopy 、 Atmosphere 、 Radius
摘要: We use the Wide-field Infrared Camera (WIRCam) on Canada-France-Hawaii Telescope to observe four transits of super-Earth planet GJ 1214b in near-infrared. For each transit, we 1214 two bands nearly simultaneously by rapidly switching WIRCam filter wheel back and forth for duration observations. By combining all our J-band ({approx}1.25 {mu}m) observations find a transit depth, analogous planet-to-star radius ratio squared, this band (R{sub PJ} /R{sub *}){sup 2} = (1.338 {+-} 0.013)%-a value consistent with optical depth reported Charbonneau collaborators. However, best-fit combined K{sub s}-band ({approx}2.15 is deeper: PKs} (1.438 0.019)%. Formally, are deeper than observed factor PJ}){sup 1.072 0.018-a 4{sigma} discrepancy. The most straightforward explanation spectral absorption feature from limb atmosphere planet; be prominent, must have large-scale height low mean molecular weight. That is, its atmospheremore » would hydrogen/helium dominated better described as mini-Neptune. recently published 0.78 1.0 {mu}m, Bean collaborators, show lack features depths those obtained likely atmospheric composition that arises these less clear; if dominated, then it either haze layer obscuring transit-depth differences at shorter wavelengths or significantly different what current models predict. Our disfavor water-world composition, but such will remain possibility until reconfirm detect other wavelengths.« less
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