nov 142012
 
Mystery Dust Around a Dead Star with a Close Companion Found

  Astronomers using data from NASA’s Wide-field Infrared Survey Explorer, or WISE, have discovered dust in an unusual place–just outside the reach of a binary star system with a short 3-hour orbit. The binary consists of a white dwarf with a red dwarf companion separated by a distance slightly larger than the radius of the [continue reading]

sep 062012
 
Where are the Companions of Supernovae?

  Japanese researchers discovered that a Type Ia supernova occurs after its companion star evolves into a faint helium white dwarf in many cases, given the fact that the white dwarf is spinning in the progenitor system. Figure 1. Configuration of progenitor binary system in the case of a red-giant (left) and a white dwarf (right, [continue reading]

jul 022012
 
Galaxy Harbours Many Star-Snacking Black Holes

  Astronomers have found evidence of hundreds of black holes in a galaxy 250 million light years away. The discovery, made with a worldwide network of radio telescopes, gives scientists a new way to find out how black holes are created. Three variable radio sources in Arp 220, a galaxy 250 million light years away. [continue reading]