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2017 Hot Sci @ STScI

Constraining Stellar Coronal Mass Ejections through Multi-wavelength Analysis

Presented by: Michael Crosley  (Space Telescope Science Institute)
Category: Science Colloquia   Duration: 30 minutes   Broadcast date: July 19, 2017
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One factor important to habitability is the impact of stellar eruptive events on nearby exoplanets. Currently this is poorly constrained due to heavy reliance on solar scaling relationships and a lack of experimental evidence. Low frequency dynamic spectra of radio bursts from nearby stars offer the best chance to directly detect the stellar signature of transient mass loss on low mass stars. We use solar of observations analogous to those found in the stellar studies to test the validity of the multi-wavelength methodology purposed by Crosley et al. (2016) to determine coronal mass ejection parameters such as speed, mass, and kinetic energy. X-ray observations by the Geostationary Operational Environmental Satellite X-ray and radio observations Bruny Island Radio Spectrometer radio are processed and compared to direct white light measurements of the Large Angle and Spectrometric Coronagraph. These findings are then applied to a 15 hr observation of YZ Canis Minoris (YZ CMi), a nearby M dwarf flare star, taken at the Low Frequency Array (10~190 MHz). We explore the range of parameter space for type II radio bursts constrained by our observations. While no events have yet been confirmed, these results will be directly applicable to interpretation of any detected stellar events and derivation of stellar CME properties.