LAMOST Observations of Flaring M Dwarfs in the Kepler Field

TL;DR

This study combines LAMOST spectra and Kepler data to analyze flare activity in early M dwarfs, revealing correlations between chromospheric emission, rotation, and flare characteristics.

Contribution

It provides new insights into the relationship between magnetic activity, rotation, and flare properties in M dwarfs using combined spectroscopic and photometric data.

Findings

Strong chromospheric emission correlates with high flare activity.

Faster rotating M dwarfs show higher magnetic activity.

Flare size and emission features relate to rotation periods.

Abstract

A sample of the LAMOST spectra of the early type M0-M3 dwarfs is compared with the Kepler observations. It is found that M dwarfs with strong chromospheric emission in $H_{\alpha}$ have large flare activity in general. The rotational periods derived from the Kepler measurements have close correlations with the sizes of the flares, the power-law distribution index and the equivalent widths of the $H_{\alpha}$ emission. A clear trend exists for higher magnetic activities being detected in faster rotating M dwarfs (rotation periods $<$ 20 day).