Three recipes for improving the image quality with optical long-baseline interferometers: BFMC, LFF, \& DPSC

TL;DR

This paper introduces three innovative methods—BFMC, LFF, and DPSC—for enhancing image quality in optical long-baseline interferometry, combining classical and self-calibration techniques to produce more reliable and detailed astronomical images.

Contribution

It presents three new recipes, including a novel self-calibration approach using wavelength-differential phases, to improve optical interferometric imaging.

Findings

BFMC and LFF improved image reliability in contests

Self-calibration technique enhanced image detail

Methods successfully applied to scientific publications

Abstract

We present here three recipes for getting better images with optical interferometers. Two of them, Low- Frequencies Filling and Brute-Force Monte Carlo were used in our participation to the Interferometry Beauty Contest this year and can be applied to classical imaging using V 2 and closure phases. These two addition to image reconstruction provide a way of having more reliable images. The last recipe is similar in its principle as the self-calibration technique used in radio-interferometry. We call it also self-calibration, but it uses the wavelength-differential phase as a proxy of the object phase to build-up a full-featured complex visibility set of the observed object. This technique needs a first image-reconstruction run with an available software, using closure-phases and squared visibilities only. We used it for two scientific papers with great success. We discuss here the pros and cons of such imaging technique.