22 citations · 98 across the 22 of their papers we have counts for
5 papers · 1 filter
Fitting Moving Objects in Up-The-Ramp Data with Applications to the Roman Space Telescope and JWST
Timothy D. Brandt
A moving object breaks the fundamental property of constant per-pixel count rates in an astronomical image read out up-the-ramp. In this paper, we show how to fit a moving object's…
Effects of Jump Detection and Ramp Fitting Algorithms on NIRISS/SOSS Exoplanet Time-Series Observations
Aarynn Carter, Néstor Espinoza, Loïc Albert +4
Jump detection and ramp fitting are fundamental steps when elevating JWST data products from up-the-ramp measurements to integration level count rate images. Occurring at an early…
Astrometry as a Tool for Discovering and Weighing Faint Companions to Nearby Stars
Timothy D. Brandt
This tutorial covers the use of absolute astrometry, in particular from the combination of the Hipparcos and Gaia missions, to identify faint companions to nearby stars and to meas…
Likelihood-Based Jump Detection and Cosmic Ray Rejection for Detectors Read Out Up-the-Ramp
Timothy D. Brandt
This paper implements likelihood-based jump detection for detectors read out up-the-ramp, using the entire set of reads to compute likelihoods. The approach compares the valu…
Optimal Fitting and Debiasing for Detectors Read Out Up-the-Ramp
Timothy D. Brandt
This paper derives the optimal fit to a pixel's count rate in the case of an ideal detector read out nondestructively in the presence of both read and photon noise. The approach is…