Making FORS2 Fit for Exoplanet Observations (again)
Abstract
For about three years, it has been known that precision spectrophotometry with FORS2 suffered from systematic errors which made quantitative observations of planetary transits impossible. We identified the longitudinal atmospheric dispersion corrector (LADC) as the most likely culprit, and therefore engaged in a project to exchange the LADC prisms with the uncoated ones from FORS1. This led to a significant improvement in the depth of the FORS2 zero points, a reduction in the systematic noise, and should make FORS2 competitive again for transmission spectroscopy of exoplanets.
- Publication:
-
The Messenger
- Pub Date:
- March 2015
- DOI:
- 10.48550/arXiv.1502.03172
- arXiv:
- arXiv:1502.03172
- Bibcode:
- 2015Msngr.159....6B
- Keywords:
-
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics;
- Physics - Instrumentation and Detectors
- E-Print:
- To appear in the March issue of the ESO Messenger