Flaring Stars in a Non-targeted mm-wave Survey with SPT-3G

Understand

We present a flare star catalog from four years of non-targeted millimeter-wave survey data from the South Pole Telescope (SPT).

• The data were taken with the SPT-3G camera and cover a 1500-square-degree region of the sky from $20^{h}40^{m}0^{s}$ to $3^{h}20^{m}0^{s}$ in right ascension and $-42^{\circ}$ to $-70^{\circ}$ in declination.
• This region was observed on a nearly daily cadence from 2019-2022 and chosen to avoid the plane of the galaxy.
• A short-duration transient search of this survey yields 111 flaring events from 66 stars, increasing the number of both flaring events and detected flare stars by an order of magnitude from the previous SPT-3G data release.