In 2004 and 2006, the Hubble House Telescope captured one thing unbelievable. There appeared to be a planet orbiting a star known as Fomalhaut 25 light-years away, and it was straight detectable in seen the light: extremely uncommon for exoplanets that are normally too small and faint to be seen.
The article, formally named Fomalhaut b or Dagon, was announced in 2008 and confirmed in 2012, considered a fuel large on a 1,700-year, extremely elliptical orbit around its host star.
However, whereas inspecting beforehand unpublished Hubble pictures taken again in 2014, astronomers bought a shock. The putative planet hadn’t simply modified. It wasn’t that its orbit was not as anticipated.
Dagon had vanished altogether. As a replacement was… nothing, main astronomers to the conclusion that the spot was by no means an exoplanet in any respect. As an alternative, they now consider the intense spot seen in these early Hubble photographs was a good rarer sight – the aftermath of a collision between two asteroid-sized planetesimals.
The identification of Dagon as an exoplanet was by no means downside free. Fomalhaut is kind of a younger star, round 440 million years previous, and nonetheless surrounded by an icy ring of mud and gasoline, the remnants of a circumstellar disc.
This means any planets orbiting the star must also be fairly younger, and due to this fact heat, emitting infrared radiation – but no infrared radiation was detected emitting from Dagon. It was additionally unusually bright in blue optical wavelengths, which is not in keeping with our fashions of planet formation.
To clarify these peculiarities, astronomers proposed that the planet was shrouded by a huge ring or cloud of dust, maybe as the results of collisions with different objects, or a smaller planet with an enormous ring system. Some even proposed that Dagon could also be a neutron star.