Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology
In his PhD dissertation Martin Bo Nielsen performs observational studies of rotation in stars like the Sun. The interior rotation in stars is thought to be one of the driving mechanisms of stellar magnetic activity, but until now this mechanism was unconstrained by observational data.
NASA’s Kepler space mission provides high-precision observations of Sun-like stars which allow rotation to be inferred using two independent methods: asteroseismology measures the rotation of the stellar interior, while the brightness variability caused by features on the stellar surface trace the rotation of its outermost layers. By combining these two techniques Martin Bo Nielsen was able to place upper limits on the variation of rotation with depth in five Sun-like stars. These results suggest that the interior of other Sun-like stars also rotate in much the same way as our own Sun.
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2 Paper IRotation Periods of 12000 MainSequence Kepler Stars
3 Paper IIRotational Splitting as a Function of Mode Frequency for Six Sunlike Stars
4 Paper IIIConstraining Differential Rotation of Sunlike Stars from Asteroseismic and Starspot Rotation Periods
Constraining Interior Rotational Shear
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Differential Rotation in Sun-like Stars from Surface Variability and ...
Martin Bo Nielsen
No preview available - 2017
Aerts ages Aigrain angular momentum Appourchaux asteroseismology Astrophysics Basu Benomar calibrated Ceillier Christensen-Dalsgaard computed convection zone convective envelope Deheuvels differential rotation dynamo E.V. Quintana Elsworth estimate exoplanet function G.R. Davies Gizon Göttingen Handberg Hekker helioseismology internal rotation J.C. Smith J.D. Twicken J.M. Jenkins Karoff Kepler data Kepler mission Kepler targets Kjeldsen latitude light curves Lorentzian profiles M-type M.B. Nielsen magnetic activity main-sequence Mathur MCMC McQuillan Measuring Rotation median method MNRAS mode frequencies mode set Mosser noise observed oscillation p-mode envelope PDC_MAP peak peakbagging photometric posterior distribution power spectrum R.A. García radial differential rotation radial orders radiative interior Reiners Rotation in Sun-like rotation periods rotation profile rotational splitting S.A. Barnes S.T. Bryson Salabert sample Schou Schunker Seismic shows solar-like solar-like oscillators spectral type Stahn starspots stellar rotation Stello Sun-like stars surface rotation rates surface variability T.L. Campante T.S. Metcalfe velocities W.J. Chaplin width