Goddard Extrasolar Planet Seminar
|The high-energy radiation and particle environment around M dwarfs with exoplanets
Dr. Allison Youngblood - NPP @ NASA GSFC
M dwarfs are prime targets for current and upcoming exoplanet searches, because they are nearby, numerous, and comparatively easy to detect. Nearby transiting M dwarf terrestrial planets will likely be the first targets of upcoming atmospheric characterization efforts. Critical to these efforts will be the knowledge of the host star’s stellar spectral energy distribution (SED), especially at high energies, and how the SED changes over short and long timescales. UV and X-ray stellar radiation impacts planetary atmospheres through heating and photochemistry, even regulating production of potential biomarker gases. Together with stellar energetic particles, the star can drive atmospheric loss. In this talk, I will review what we know today about M dwarfs’ high-energy spectra, largely from the MUSCLES Treasury Survey with Hubble, and how we can infer M dwarf UV radiation from optical chromospheric tracers after Hubble. I will also discuss current and future tools we have of estimating stellar energetic particles (including CMEs), and the importance of including particles when modeling the effects of large stellar flares on an exoplanet’s atmosphere.
|Date||October 03, 2017|
|Start/End Time||12:00 PM - 01:00 PM|
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