Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features
Type Ia supernovae are key tools for measuring distances on a cosmic scale. They are generally thought to be the thermonuclear explosion of an accreting white...
CoRoT Measures Solar-Like Oscillations and Granulation in Stars Hotter Than the Sun
Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties...
CoRoT Reveals a Magnetic Activity Cycle in a Sun-Like Star
The 11-year activity cycle of the Sun is a consequence of a dynamo process occurring beneath its surface. We analyzed photometric data obtained by the CoRoT...
Deep Impact: Observations from a Worldwide Earth-Based Campaign
On 4 July 2005, many observatories around the world and in space observed the collision of Deep Impact with comet 9P/Tempel 1 or its aftermath. This was an...