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View Full Version : First Evidence of Extrasolar Planets Discovered In 1917



Squink
2014-Oct-23, 04:22 PM
From SlashDot: First Evidence of Extrasolar Planets Discovered In 1917 (http://science.slashdot.org/story/14/10/22/031207/first-evidence-of-extrasolar-planets-discovered-in-1917?utm_source=rss1.0moreanon&utm_medium=feed)
van Maanen 2 and sits 14 light-years from here. It was discovered by the Dutch astronomer Adriaan van Maanen in 1917, but it was initially hard to classify. That's because its spectra contains lots of heavy elements alongside hydrogen and helium, the usual components of a white dwarf photosphere. In recent years, astronomers have discovered many white dwarfs with similar spectra and shown that the heavy elements come from asteroids raining down onto the surface of the stars. It turns out that all these white dwarfs are orbited by a large planet and an asteroid belt.
It'd be nice to see a ref for that last claim. I'd not heard it before.

StupendousMan
2014-Oct-23, 07:52 PM
I don't believe that claim. I suspect that the writer meant to say,



It turns out that OUR CURRENT BEST MODELS FOR SUCH SYSTEMS are A WHITE DWARF orbited by a large planet and an asteroid belt.