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Slitless spectrophotometry with forward modelling: principles and application to atmospheric transmission measurement
Jérémy Neveu, Vincent Brémaud, Pierre Antilogus +9
In the next decade, many optical surveys will aim to tackle the question of dark energy nature, measuring its equation of state parameter at the permil level. This requires trustin…
Uniform Recalibration of Common Spectrophotometry Standard Stars onto the CALSPEC System using the SuperNova Integral Field Spectrograph
David Rubin, G. Aldering, P. Antilogus +35
We calibrate spectrophotometric optical spectra of 32 stars commonly used as standard stars, referenced to 14 stars already on the HST-based CALSPEC flux system. Observations of CA…
Improving the astrometric solution of the Hyper Suprime-Cam with anisotropic Gaussian processes
P. -F. Léget, P. Astier, N. Regnault +5
We study astrometric residuals from a simultaneous fit of Hyper Suprime-Cam images. We aim to characterize these residuals and study the extent to which they are dominated by atmos…
Tearing and related field distortions in deep-depletion CCDs
Claire Juramy, Pierre Antilogus, Laurent Le Guillou +1
Tearing patterns affecting flat field frames in CCDs are a visually striking obstacle to performing Pixel Response Non-Uniformity corrections. These patterns can be explained by la…
The shape of the Photon Transfer Curve of CCD sensors
Pierre Astier, Pierre Antilogus, Claire Juramy +4
The Photon Transfer Curve (PTC) of a CCD depicts the variance of uniform images as a function of their average. It is now well established that the variance is not proportional to…
4MOST: Project overview and information for the First Call for Proposals
R. S. de Jong, O. Agertz, A. Agudo Berbel +335
We introduce the 4-metre Multi-Object Spectroscopic Telescope (4MOST), a new high-multiplex, wide-field spectroscopic survey facility under development for the four-metre-class Vis…