Constraints on the radial differential rotation of six Sun-like stars Martin Bo Nielsen Laurent Gizon, Hannah Schunker and Jesper Schou Institute for Astrophysics.

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Presentation transcript:

Constraints on the radial differential rotation of six Sun-like stars Martin Bo Nielsen Laurent Gizon, Hannah Schunker and Jesper Schou Institute for Astrophysics Göttingen Max Planck Institute for Solar System Research Dec. 5 th 2014 Plato 2.0 Science Conference, Taormina, Italy

Internal rotation, why do we care? Stellar dynamos Stellar dynamos Differential rotation Differential rotation Shear layer regenerates magnetic field Shear layer regenerates magnetic field Gyrochronology Gyrochronology Stellar wind Stellar wind Internal angular momentum? Internal angular momentum? Stellar models Stellar models Structure and evolution Structure and evolution Schou et al. (1998) Martin Nielsen, Plato 2.0

Asteroseismology CoRoT – HD52265Kepler – HAT-P-7 Gizon et al. 2013Lund et al. 2014

Martin Nielsen, Plato 2.0Star Teff [K]* logg [cm/s/s]* Spot rotation period [days] KIC ±924.28± KIC ±974.07± KIC ±704.40±0.08- KIC ± ± KIC ±974.21± KIC ± ± *Molenda-Żakowicz et al Six Sun-like Kepler Stars

Martin Nielsen, Plato 2.0 Peakbagging l=2 m = 0,±1,±2 l=1 m = 0,±1 l=0

Martin Nielsen, Plato 2.0 Splitting and inclination Nielsen et al. (2014)

Martin Nielsen, Plato 2.0 Spot rotation vs. asteroseismology Davies et al. in prep.

Martin Nielsen, Plato 2.0 Summary Constrained radial differential rotation for six Sun-like stars. Constrained radial differential rotation for six Sun-like stars. Appears very consistent with comparison to solar data. Appears very consistent with comparison to solar data. Rotation periods measured by asteroseismology and starspots are consistent. Rotation periods measured by asteroseismology and starspots are consistent. Possible improvements: Possible improvements: Fitting ensembles of PLATO stars Fitting ensembles of PLATO stars Accurate treatment of mode widths Accurate treatment of mode widths Fit using specific profile (e.g. step function) Fit using specific profile (e.g. step function) Thank you