Around an orange dwarf star just 130 light-years from Earth, astronomers have discovered an unexpected treasure.
Not only is the star orbited by three rocky super-Earth worlds, but two more exoplanets in the system are almost incredibly rare in our records.
Finding exoplanets is hard, and finding small ones is even harder. Currently, astronomers rely on two main methods: the transit method and the radial velocity method. As you can imagine, both these signals – transit and radial velocity – are tiny. We're more likely to detect bigger signals created by bigger exoplanets.
The difference, astronomers suspect, may be in the presence or lack of an atmosphere. This can be inferred by calculating the density of an exoplanet, if you have both transit and radial velocity data. HD 23472 d has an orbital period of 3.98 days, a radius 0.75 times that of Earth, and a mass 0.54 times that of Earth.
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