Olivier Chesneau's work on novae

TL;DR

Olivier Chesneau pioneered observational techniques to resolve nova fireballs early after explosion, revealing their aspherical nature and establishing new methods for distance estimation based on direct imaging and geometry.

Contribution

This work introduced the first direct imaging of nova fireballs, demonstrating their aspherical shape and proposing a novel geometric approach for distance measurement.

Findings

Novae are aspherical at early stages.

Direct imaging can determine nova distances.

New paradigm for nova physics and distance estimation.

Abstract

Olivier Chesneau founded a brand new field of observational astrophysics with his attempts to resolve the novae expanding fireball from the very first days of the explosion. With the images he could get, he showed that novae do indeed explode in an aspherical way, leading to a change of paradigm for the physics of these yet-poorly understood catastrophic systems. He also set the stage for a new way of estimating novae distances, by directly measuring the sky-size of the fireball and comparing it with spectroscopic scales, taking into account the tremendous effects of the fireball geometry.