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Differential rotation from light curves – FDL ...

Brett Morris
June 11, 2020
Science
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17

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

  1. Differential rotation from light curves Brett Morris Universität Bern

  2. Galileo (1612)

  3. Spot latitudes and spot evolution encode information.

  4. NASA SDO

  5. Solar activity cycle Morris+ 2019

  6. None

  7. Light curves have amplitudes and periods

  8. TESS Light Curve (days) Morris+ 2020 (in prep)

  9. Morris 2020

  10. Light Curve Inferred Fractional Spot Coverage f s Inferred Spot

    Map Morris 2020

  11. Differential rotation and spot evolution produce similar effects on light

    curves.
  12. None

  13. Real spots have lifetimes similar to the rotation period.

  14. None

  15. 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