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

• DOI: 10.48550/arxiv.2401.13525
• Publication Date: 2024-01-01
• Authors: C. Tandoi; S. Guns; A. Foster; P. A. R. Ade; A. J. Anderson; B. Ansarinejad; M. Archipley; L. Balkenhol; K. Benabed; A. N. Bender; B. A. Benson; F. Bianchini; L. E. Bleem; F. R. Bouchet; Lincoln Bryant; E. Camphuis; J. E. Carlstrom; T. Cecil; C. L. Chang; P. Chaubal; P. M. Chichura; T.-L. Chou; A. Coerver; T. M. Crawford; A. Cukierman; C. Daley; T. de Haan; K. R. Dibert; M. Dobbs; A. Doussot; Daniel Dutcher; W. Everett; C. Feng; K. R. Ferguson; K. Fichman; S. Galli; A. E. Gambrel; R. W. Gardner; Fan Ge; N. Goeckner-Wald; R. Gualtieri; F. Guidi; N. W. Halverson; E. Hivon; G. P. Holder; W. L. Holzapfel; J. C. Hood; N. Huang; F. Kéruzoré; L. Knox; M. Korman; K. Kornoelje; C. -L. Kuo; A. T. Lee; Karen Lévy; A. E. Lowitz; C. Lu; Abhishek S. Maniyar; F. Menanteau; M. Millea; J. Montgomery; Yong‐Jae Moon; Y. Nakato; T. Natoli; G. I. Noble; V. Novosad; Y. Omori; S. Padin; Z. Pan; P. Paschos; Kedar A. Phadke; K. Prabhu; Zhijie Qu; Wei Quan; M. Rahimi; A. Rahlin; C. L. Reichardt; C. Reuter; M. Rouble; J. E. Ruhl; E. Schiappucci; G. Smecher; J. A. Sobrin; A. A. Stark; J. Stephen; Akihiro Suzuki; K. L. Thompson; B. Thorne; Cynthia Trendafilova; C. Tucker; C. Umiltà; J. D. Vieira; Y. Wan; G. Wang; N. Whitehorn; W. L. K. Wu; V. Yefremenko; M. R. Young; J. A. Zebrowski
• Keywords: ROSAT; Flare; Galactic plane; Flare star

We present a flare star catalog from four years of non-targeted millimeter-wave survey data the South Pole Telescope (SPT). The were taken with SPT-3G camera and cover 1500-square-degree region sky $20^{h}40^{m}0^{s}$ to $3^{h}20^{m}0^{s}$ in right ascension $-42^{\circ}$ $-70^{\circ}$ declination. This was observed on nearly daily cadence 2019-2022 chosen avoid plane galaxy. A short-duration transient search this yields 111 flaring events 66 stars, increasing number both detected stars by an order magnitude previous release. provide cross-matching Gaia DR3, as well matches X-ray point sources found second ROSAT all-sky survey. have across main sequence, early-type M dwarfs, large population evolved stars. These are mostly nearby, spanning 10 1000 parsecs distance. Most spectral indices constant or gently rising function frequency at 95/150/220 GHz. timescale these can range minutes hours, peak $\nu L_{\nu}$ luminosities $10^{27}$ $10^{31}$ erg s$^{-1}$ bands.