4.2 Exo-planet: Astrometry

• Phase : 4
• Status : Draft
• Category : Science verification / Early science (C8)
• Recurrence : once after the completion of nighttime testing and performance check
• Duration : 1 night(s)

Description

• Exo-planet: Astrometry

Prerequisites

• Authorize SHARK-NIR on the SX side.
• Atmospheric conditions: CLEAR
• Bad pixel map, Background or Dark, Flat-field, distortion map
• Cloud Cover : No cloud
• Astronomical Seeing : 0.8" or better
• Sky Background : Any
• Water Vapor : low
• Timing Windows : better to observe during the passage of the target at the meridian (+/- 1 hour before)
• Observing Targets : TBD We will consider stars with H mag in the range 4-12 (typical 7-9), R will have a similar distribution. It will be better to choose a target with known companions and bright enough to be easily observed.
• Observing Filters : TBD
• Detector Mode, DIT: according to the target brightness (TBD)
• Daytime Calibration Data required: dark/background, instrument flat
• Nighttime Calibration Data required: flux calibration and centering data (only in case of coronagraphic observation - standard case)

Procedure

• After pre-set and acquisition of the target we will run on flux calibration template with the star off-centered from the coronagraph (short template - few minutes). After this, a centering observation follows with the Fourier mode on the DM allowing the creation of four satellite spots (around 5% of the target brightness). Also, this template is short.
• We then perform the scientific coronagraphic observation using pupil stabilized observing mode. This observation should be taken during the passage of the star to the meridian to maximize the rotation of the FOV and allowing to implement the ADI. This part should be at least 1:20-1:30 hours long.
• The observation is closed running again centering and flux calibration with the same modalities adopted at the beginning of the observations.

Notes

LBTO support

• AO support

Associated SHARK-NIR personnel

Date performed and by whom