EUROPE: The system, named HD219134, in the constellation Cassiopeia hosts one outer giant planet and three inner super-Earths, one of which transits in front of the star.
A new “secret” planetary system that includes three super-Earths and one outer giant planet has been discovered by astronomers at a distance of just 21 light years from Earth.
The remarkable system, named HD219134, in the constellation Cassiopeia hosts one outer giant planet and three inner super-Earths, one of which transits in front of the star. The transiting super-Earth has a density similar to the Earth’s. It is by far the closest transiting planet known today, researchers said.
The system is so close that astronomers already dream about taking pictures of the new “Stars.” HARPS-N, designed and built by an international consortium and installed at the Telescopio Nazionale Galileo on the La Palma island in Spain, unveiled the exceptional planetary system around HD219134.
The star, a 5th magnitude K dwarf, slightly colder and less massive than our Sun, is so bright that it can followed with a naked eye from dark skies, next to one leg of the W-shape Cassiopeia constellation, all year round in our boreal hemisphere, researchers said. The cortege of planets is composed of three mostly rocky super-Earths and an outer giant planet, a configuration reminiscent of Earth’s own Solar System, they said.
“When the first HARPS-N radial-velocity measurements indicated the presence of a 3-day planet around HD219134, we immediately asked NASA for Spitzer space telescope time,” said Ati Motalebi, astronomer at University of Geneva (UNIGE) and first author of the paper describing the discovery.
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