NACO Pipeline: NOAO Science Data

NACO Science Data:
Imaging SDI+4

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Frame Type SCIENCE_SDI
DPR.TYPE OBJECT; SKY
DPR.TECH SDI4; SDI4,PT; SDI4,CUBE; SDI4,CUBE,PT

description: The SDI4 has been offered since P81 (April 2008). It is a combination of the SDI+ (see imaging, SDI/SDI+) and the 4 quadrant phase mask (coronography), optimized for the H-band. The purpose of this mode is to achieve high contrast and improve detectability of faint sub-stellar companions near bright stars, ideally down to massive extra solar giant planets, by reducing the photon noise at small angular separation.

For further details consult the NACO User Manual.

This is an example of the SDI4 science observations. Note the characteristic 4 quadrant pattern of the SDI+ field-of-view each superposed with the 4QPM_H mask.

This mode is offered in visitor mode and is not supported by the pipeline.

calibrations:The calibration plan includes

standard detector darks with readout mode and DIT matching the one used for science;

users are offered possibility to design the night time flat fields taken immidiately after the science exposures to avoid problems with instrument flexure;