Category Archives: Stellar Science

Eternal spotshine of the spinning red suns

Introduction Much of our time on sky with HPF is dedicated to discovering exoplanets, and measuring their detailed properties.  To do this, we concentrate our efforts on older, magnetically quiet stars to minimize noise and make the planets easier to … Continue reading

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Stellar Activity in the Near-Infrared: We Need a New Ruler!

Introduction We talk about stellar activity a lot on this blog.  Once HPF gets on sky, radial velocity noise from stellar activity will likely be the biggest impediment to finding exoplanets.  Thus, if we want HPF’s chief scientific mission of … Continue reading

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The Color of Sunspots: Studying Solar Activity

In this blog, we have highlighted how stellar activity can hinder and even masquerade as planetary signals (see Gliese 581 and Gliese 667C). The stars discussed in those posts were important, not only because they may harbor habitable zone planets, … Continue reading

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