9 August 2016 Regaining the FORS: making optical ground-based transmission spectroscopy of exoplanets with VLT+FORS2 possible again
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Abstract
Transmission spectroscopy facilitates the detection of molecules and/or clouds in the atmospheres of exoplanets. Such studies rely heavily on space-based or large ground-based observatories, as one needs to perform time-resolved, high signal-to-noise spectroscopy. The FORS2 instrument at ESO's Very Large Telescope is the obvious choice for performing such studies, and was indeed pioneering the field in 2010. After that, however, it was shown to suffer from systematic errors caused by the Longitudinal Atmospheric Dispersion Corrector (LADC). This was successfully addressed, leading to a renewed interest for this instrument as shown by the number of proposals submitted to perform transmission spectroscopy of exoplanets. We present here the context, the problem and how we solved it, as well as the recent results obtained. We finish by providing tips for an optimum strategy to do transmission spectroscopy with FORS2, in the hope that FORS2 may become the instrument of choice for ground-based transmission spectroscopy of exoplanets.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Henri M. J. Boffin, Henri M. J. Boffin, Elyar Sedaghati, Elyar Sedaghati, Guillaume Blanchard, Guillaume Blanchard, Oscar Gonzalez, Oscar Gonzalez, Sabine Moehler, Sabine Moehler, Neale Gibson, Neale Gibson, Mario van den Ancker, Mario van den Ancker, Jonathan Smoker, Jonathan Smoker, Joseph Anderson, Joseph Anderson, Christian Hummel, Christian Hummel, Danuta Dobrzycka, Danuta Dobrzycka, Alain Smette, Alain Smette, Gero Rupprecht, Gero Rupprecht, "Regaining the FORS: making optical ground-based transmission spectroscopy of exoplanets with VLT+FORS2 possible again", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99082B (9 August 2016); doi: 10.1117/12.2232094; https://doi.org/10.1117/12.2232094
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