More than 60% of the stars in the Milky Way have a companion star around which they orbit.
HR4796A does have one other particularly intriguing feature: a companion star.
By then, the outer layers of its companion star have been completely torn away and the accretion disc has vanished: millisecond pulsars do not have accretion discs.
"The eccentric planetary orbits seen in these systems are essentially scars from past disruptions caused by the companion star, " co-author Sean Raymond, of the University of Bordeaux and the National Center for Scientific Research in France, said in a statement.
That is good enough to see shifts caused if a star's companion is another star, but it cannot detect the tiny wobbles caused by orbiting planets.
Those white dwarf stars that find themselves near a "companion" star can draw material from their neighbour, building up to a critical mass and eventually sparking nuclear fusion again in a nova.
For then, over time, the neutron star gradually consumes its companion's outer layers.
Now, an international team of astronomers has trained the Fermi space-based gamma ray telescope on V407 Cygni, a "binary" system comprising a white dwarf star and a red giant companion, 9, 000 light-years away.
Standard Type Ia supernovae are binary systems in which a white dwarf star draws so much matter from its companion (often a red giant) that it undergoes a kind of energy overload and detonates.
Tennant and Billie Piper, who played his on-screen companion Rose Tyler, are among those who will guest star.
Simpson trial ended with the former American football star being cleared of the murder of his wife Nicole and a male companion.
We get an intro in both clips, a few seconds of banter between star Matt Smith and Jenna-Louise Coleman, who plays his upcoming companion, Clara.
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In Star Trek you can play as either Kirk or Spock, but no matter what you do your companion sticks with you throughout.
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