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Differential rotation from light curves – FDL ...
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Brett Morris
June 11, 2020
Science
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21
Differential rotation from light curves – FDL 2020
Presentation for the FDL 2020 Heliophysics/Starspots team.
Brett Morris
June 11, 2020
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Transcript
Differential rotation from light curves Brett Morris Universität Bern
Galileo (1612)
Spot latitudes and spot evolution encode information.
NASA SDO
Solar activity cycle Morris+ 2019
None
Light curves have amplitudes and periods
TESS Light Curve (days) Morris+ 2020 (in prep)
Morris 2020
Light Curve Inferred Fractional Spot Coverage f s Inferred Spot
Map Morris 2020
Differential rotation and spot evolution produce similar effects on light
curves.
None
Real spots have lifetimes similar to the rotation period.
None
Challenges to measuring stellar differential rotation from light curves •
The periodic signal we’re trying to measure only lasts one cycle, so harmonic analyses fail • Spot evolution and differential rotation are happening at the same time • We don’t know stellar inclinations in general