P3.16 Flux calibration (off-centered target observation)

• Phase : 3
• Status : Draft
• Category : Nighttime testing (functionality and operability) (C5) + Nighttime calibration (C6)
• Recurrence : once at commissioning and then on request for deep coronagraphic observations.
• Duration : 2 hours

Description

• Flux calibration to allow contrast estimation between the central star and a close companion, by measuring the star flux out of the coronagraph

Prerequisites

• Authorize SHARK-NIR on the SX side.
• Atmospheric conditions: AO working conditions.
• Bad pixel map, Background or Dark, Flat-field, distortion map

Procedure

• On target, the same set-up as an observation on science target; AO closed-loop, ND for bright targets to prevent detector saturation, the star behind coronagraph centered and off-centered keeping the stop. The derotator mode should be tracking the field with possible adjustment of the angle to prevent the star from rotating around the coronagraph.
• Observe a star with the coronagraphic devices after an offset of 0.5” is applied.

Success criteria

• Flux of the star measured within the accuracy of 0.1 mag

Notes

• Same as activity 7.2 in AD4

LBTO support

• SOUL-AO support

Associated SHARK-NIR personnel

Date performed and by whom