Effects of CTE Degradation on Cycle 18 Observations with the STIS CCD

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis

Scientific paper

The charge-transfer efficiency (CTE) of the STIS CCD - the ability of the detector to move charge between adjacent pixels during readout - continues to decline. In this ISR, we explore the scientific impact of CTE effects on Cycle 18 observations. In coronagraphic imaging, CTE trails degrade the photometry and astrometry of objects beyond the brightest regions of the stellar PSF. In spectroscopy, CTE trails remove flux from the target spectrum. In both cases, trails from cosmic rays and hot pixels impart considerable noise to observations of faint targets. Tools to correct the photometry and astrometry of point sources are available, but they are not applicable to extended sources and do not reduce the noise imparted by CTE trails. A pixel-based CTE correction would address all of these concerns, but is not yet available for STIS.

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