Phase-retrieval analysis of pre- and post-repair Hubble Space Telescope images

Krist, John; Burrows, Christopher J.

doi:10.1364/ao.34.004951

Cited by 90 publications

(65 citation statements)

References 5 publications

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“…The residual HST RMS wavefront error is in the range 25−70 nm, depending on field location, wavelength, focus, individual instrument optics, etc. (Krist & Burrows 1995;Hartig priv. comm.…”

Section: Modeling the Observationsmentioning

confidence: 99%

Probing for Evidence of Plumes on Europa With HST/Stis

Sparks¹,

Hand²,

McGrath³

et al. 2016

ApJ

223

207

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Roth et al. (2014a) reported evidence for plumes of water venting from a southern high latitude region on Europa -spectroscopic detection of off-limb line emission from the dissociation products of water. Here, we present Hubble Space Telescope (HST) direct images of Europa in the far ultraviolet (FUV) as it transited the smooth face of Jupiter, in order to measure absorption from gas or aerosols beyond the Europa limb. Out of ten observations we found three in which plume activity could be implicated. Two show statistically significant features at latitudes similar to Roth et al., and the third, at a more equatorial location. We consider potential systematic effects that might influence the statistical analysis and create artifacts, and are unable to find any that can definitively explain the features, although there are reasons to be cautious. If the apparent absorption features are real, the magnitude of implied outgassing is similar to that of the Roth et al. feature, however the apparent activity appears more frequently in our data.

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Section: Modeling the Observationsmentioning

confidence: 99%

Probing for Evidence of Plumes on Europa With HST/Stis

Sparks¹,

Hand²,

McGrath³

et al. 2016

ApJ

223

207

View full text Add to dashboard Cite

show abstract

“…The situation is more favorable than on the ground since the Strehl ratio is very high. For instance, the Hubble Space Telescope (HST) has an rms wave-front error of 0.018 mm (Krist & Burrows 1995) caused by the polishing process and corresponding to a Strehl larger than 97% at visible wavelengths. However, the "PSF breathing" prevents an accurate subtraction of the residual speckles.…”

Section: Discussionmentioning

confidence: 99%

Speckle Symmetry with High‐Contrast Coronagraphs

Boccaletti

Riaud

Rouan

2002

PUBL ASTRON SOC PAC

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ABSTRACT. We investigate the pattern of residual speckles obtained with high-contrast coronagraphs and extreme adaptive optics systems. In particular, we provide evidence of symmetry occurring for very small phase defects depending only on the ability of the coronagraph to attenuate the pupil diffraction pattern. In such a case, a centrosymmetrical subtraction of the image significantly increases the signal-to-noise ratio. Detection of very faint companions around bright stars may benefit from this characteristic in some particular conditions. Numerical simulations show that speckle symmetry takes place when using a four-quadrant phase mask coronagraph, for very high Strehl ratio ( ) and with a filled circular aperture. SR 1 0.96

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“…However, investigations after HST was placed into low-Earth orbit suggested that the actual conicconstant of the HST PM was built to was closer to κ = −1.0139. 8 As a result, all HST observations prior to the first Servicing Mission in December 1993 suffered from spherical aberration. The hallmark of such aberration is the lack of a crisp focus to the PSF, with a bright central core surrounded by a diffuse, generally symmetric halo.…”

Section: Spherical Aberrationmentioning

confidence: 99%

“…The hallmark of such aberration is the lack of a crisp focus to the PSF, with a bright central core surrounded by a diffuse, generally symmetric halo. In the case of HST, features in the HST pupil also contributed to the structure of the halo, 8 further complicating the PSF. Extended sources showed a distinct reduction in both resolution and contrast.…”

Section: Spherical Aberrationmentioning

confidence: 99%

“…Much of our knowledge of this subject comes from specialized calibration programs to monitor the HST PSF and analysis of those PSFs using parametric (model-fitting) phase retrieval. Utilizing mirror maps based on previously determined mid-frequency wavefront errors, 8 the technique iteratively generates model PSFs and compares them with the observed data. The wavefront error is characterized by the series of Mahajan Zernike polynomials 17 modified for the 0.33 obscuration applicable to HST.…”

Section: Phase Retrievalmentioning

confidence: 99%

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The temporal optical behavior of the Hubble Space Telescope: the impact on science observations

et al. 2006

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Though the Hubble Space Telescope (HST) has proven to be a stable platform for astronomical observations when compared with ground-based imaging, it features its own characteristic optical variations that have required post-observation processing to support the full range of science investigations that should be possible with HST. While the overall system focus has been monitored and adjusted throughout the life of the Observatory, the recent installation of the Advanced Camera for Surveys and its High Resolution Camera has allowed us to use phase retrieval techniques to accurately measure changes in coma and astigmatism as well. The aim of this current work is to relate these measurements of wave front error back to characterizations more common to science data analysis (e.g. FWHM, and ellipticity). We show how variations in these quantities over the timescales observed may impact the photometric and astrometric precision required of many current HST programs, as well as the characterization of barely-resolved objects. We discuss how improved characterization and modeling of the point spread function (PSF ) variations may help HST observers achieve the full science capabilities of the Observatory.

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Phase-retrieval analysis of pre- and post-repair Hubble Space Telescope images

Cited by 90 publications

References 5 publications

Probing for Evidence of Plumes on Europa With HST/Stis

Probing for Evidence of Plumes on Europa With HST/Stis

Speckle Symmetry with High‐Contrast Coronagraphs

The temporal optical behavior of the Hubble Space Telescope: the impact on science observations

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