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An exceptional planetary system discovered in Cassiopeia

Astronomers from the University of Geneva (UNIGE) and members of the NCCR PlanetS have teased out a secret planetary system hiding in the arms of Cassiopea, just 21 light years away from us. The remarkable system, named HD219134, 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. It provides the ideal candidate for follow-up studies and a deeper understanding of planetary formation, internal composition, and atmospheres. The system is so close that astronomers already dream about taking pictures of the new “Stars”.

HD 219134 light curve

HD 219134 light curve

Press release of Geneva University

Original paper accepted by A&A

System animation

"Too much water is bad for life"
Conference on habitable planets
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