Breakthroughs in Cool Star Physics with the Line Emission Mapper X-ray Probe

TL;DR

The paper discusses the potential of the Line Emission Mapper X-ray Probe (LEM) to revolutionize stellar high energy physics by enabling detailed, time-resolved studies of faint and dynamic phenomena in cool star atmospheres.

Contribution

It introduces the capabilities of LEM, highlighting its large effective area and spectral resolution, and discusses how these features will advance the understanding of stellar high energy processes.

Findings

Enhanced ability to study time-dependent stellar phenomena.

Access to fainter targets than previous X-ray observatories.

High spectral resolution enables detailed plasma diagnostics.

Abstract

We outline some of the highlights of the scientific case for the advancement of stellar high energy physics using the Line Emission Mapper X-ray Probe ({\it LEM}). The key to advancements with LEM lie in its large effective area -- up to 100 times that of the {\it Chandra} MEG -- and 1~eV spectral resolution. The large effective area opens up for the first time the ability to study time-dependent phenomena on their natural timescales at high resolution, such as flares and coronal mass ejections, and also opens the sky to much fainter targets than available to {\it Chandra} or {\it XMM-Newton}.