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IWF/ÖAW
Main task
Upper atmospheres (and magnetospheres) in the context of solar/stellar wind plasma and radiation interaction
Main research topics
1. Upper atmosphere response to solar/stellar activity
Monte Carlo & test-particle upper atmosphere and SW-plasma interaction codes → atmosphere evolution, exoplanets
2. Exoplanet Magnetospheres
Structure, topology, and dynamics of exoplanetary magnetospheres
Refereed publications (since Jan 2013)
Total: 15 (first author: 11)
Educational activities (since Jan 2013)
PhD thesis: 1; Master theses: 2
Lecturing at University of Graz
Upper Atmosphere Physics
1
IWF/ÖAW
Lead: Helmut Lammer
Members Staff: O. Archipov, M. L. Khodachenko, K. G. Kislyakova,
H.I.M. Lichtenegger, M. Pfleger, J. Sasunov Students: PhD: P. Odert; Master: I. Juvan, S.-C. Schiefer
Cooperation within IWF Atmosphere response to solar activity (Baur et al.) Solar/stellar winds/radio signals & exoplanets (Fischer et al.) Solar wind and magnetospheric interaction studies (Nakamura et al.) Heliospheric physics (Narita et al.) CoRoT/Cheops: exoplanet characterization (Steller et al.)
Key external collaboration
Austria: IfA, Univ. Vienna; Germany: DLR; Sweden: IRF; Finland: FMI; Belgium: University of Leuven; Spain: Univ. de les Illes Balears; Russia: ICM/RAS Krasnoyarsk, INASAN Moscow, Inst. of Laser Phys./RAS, Moscow State Univ.
Who are we?
2
IWF/ÖAW
Extreme solar events → young Sun/stars
Thermosphere density response GRACE
Correlation with solar proxies
Upper atmosphere impact of super-flares
Photochemical processes → suprathermal “hot” atoms (H, O, C, N)
Monte Carlo modeling of energetic neutral atoms (ENAs) and exosphere formation and escape
Model validation: VEX, MEX, Earth obs.
3
Upper Atmosphere Physics
[Gröller et al., PSS, 2014]
IWF/ÖAW 4
Surface Sputtering / Stellar Dynamics
Surface sputtering → airless bodies
Plasma surface interaction
Particle release from surfaces due to solar radiation and plasma
Precursor studies: BepiColombo, JUICE
Kepler stars photometry → deep mixing
Variation of 513 stellar LC spectral harmonics
Time scale 1 of the first rotational
harmonic ~ theoretical turnover time MLT of deep mixing
Remote probing of stellar deep convection
IWF/ÖAW 4
1
MLT
Callisto: sputtered O exosphere
IWF/ÖAW
Escape of nebula-based or degassed protoatmospheres from early Solar System planets and “super-Earths” (exoplanets)
Hydro-code development
ThermosphereEUV heating
Atmosphereexpansion
Thermal escape of H, O, C
Dragging of O, C, N, CO2, etc.
Effect on density,radius-mass
5
Atmosphere Evolution
[Rauer et al., Exp. Astron., 2014] [Lammer et al., MNRAS, 2014]
Mars-size planetaryembryo at 1 AU
Characterization of exoplanet exosphere-magnetosphere environments by UV observations and hydrogen cloud, stellar radiation and plasma interaction modeling
Hydrogen coronaemodeling
ENA heatingfeedback studies
Plasma interaction & ion escape
Space weathereffect studies
HST UV spectrareproduction
IWF/ÖAW 6
Exoplanet Environments
[Kislyakova et al., A&A, 2014] [Kislyakova et al., Astrobiol., 2013]
IWF/ÖAW
MHD simulations of the flow-driven magnetodisk formation
No or weak rotation case:
Stellar XUV atm. heating & expansion deformation of dipole field
inner region locked plasma thin disk region
plasma follows field lines
Experimental confirmation of the flow-driven magnetodisk formation
typical topology of magnetic field
electric current sheet in the equatorial plane
Exoplanet Magnetospheres
7
IWF/ÖAW
Solar/stellar plasma dynamics: Solar Orbiter Tachocline, photosphere, chromosphere, corona
Upper atmosphere solar activity response: MEX, VEX, LEOs, etc.
Hot C, O, N & H atom escape from Venus, Earth, Mars, exoplanets
Model validation on solar event (CMEs) studies at Earth’s thermosphere
Solar activity & plasma response on Mercury’s and Jovian satellite surfaces: BepiColombo, JUICE
EUV, CME & plasma related particle release and exosphere formation
Origin & evolution of atmospheres, exoplanets: CoRoT, CHEOPS
Protoatmosphere escape studies (sub- to super-Earths) Upper atmosphere structure, radiation & particle heating Stellar plasma electrodynamics/exoplanet and exo-
magnetosphere hypotheses tests via Lyman-α diagnostic
Future Plans: 2015-2018
8