Hot Jupiter and Red Dwarf (IMAGE) Arizona State University Caption This illustration shows a hot Jupiter orbiting so close to a red dwarf star that the magnetic fields of both interact, producing activity on the star. Astrophysicists have used that activity to calculate field strengths in four hot Jupiter star-and-planet systems. Credit NASA, ESA and A. Schaller (for STScI) Usage Restrictions No restrictions when used in connection with reportage on this story License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.