A CRIRES-search for H<sub>3</sub><sup>+</sup>emission from the hot Jupiter atmosphere of HD 209458 b
Journal: Astronomy and Astrophysics
Year: 2016

Close-in extrasolar giant planets are expected to cool their thermospheres by producing H3+ emission in the near-infrared (NIR), but simulations predict H3+ emission intensities that differ in the resulting intensity by several orders of magnitude. We want to test the observability of H3+ emission with CRIRES at the Very Large Telescope (VLT), providing adequate spectral resolution for planetary atmospheric lines in NIR spectra. We search for signatures of planetary H3+ emission in the L′ band,