Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!


Forgot your password?
Take advantage of Black Friday with 15% off sitewide with coupon code "BLACKFRIDAY" on Slashdot Deals (some exclusions apply)". ×

Submission + - Hot Planet Cools Off Its Own Sun (sciencemag.org)

sciencehabit writes: What do you do if you're a hot Jupiter and want to cool off? Why, you use your gravity to lift up the surface of your sun, cooling it and creating a dark spot on the star. In a forthcoming issue of The Astrophysical Journal Letters, astronomers will report using the Kepler spacecraft to observe the brightness of a star in the constellation Cygnus more than a million times. Named HAT-P-7, this star has a hot Jupiter—a giant planet orbiting close-in —which other scientists found before NASA launched the spacecraft. The world's gravity raises the star's surface away from its hot center, causing part of the surface to cool by just a fraction of a degree Kelvin and produce a dark spot that lags behind the planet's position by a few hours. If confirmed, this discovery is the first time astronomers have ever seen planet-induced "gravity darkening" and demonstrates Kepler's remarkable ability to detect even the subtlest of stellar signals.
This discussion was created for logged-in users only, but now has been archived. No new comments can be posted.

Hot Planet Cools Off Its Own Sun

Comments Filter:

Money is the root of all evil, and man needs roots.