![]() ![]() Tess routinely records observational data such as characteristic brightness variations caused by stellar oscillations from thousands of stars. It wasn't until Nasa's space telescope Tess (Transiting Survey Satellite) took a closer look between 20 that it became possible to determine other properties of the star and its companion. Without knowing of the host star’s red-giant stage Halla's close orbit did not surprise. Also, the measurements at the Bohyunsan Optical Astronomy Observatory at that time could not firmly identify the evolutionary state of the star. Upon its discovery eight years ago by a South Korean research team, exoplanet Halla was by no means deemed remarkable. ![]() As a result, Halla may never have been in any danger. Most likely, Baekdu was born as part of a binary system and therefore never expanded to a size that would be expected for a single star reaching the same evolutionary stage. ![]() A researcher from the Max Planck Institute for Solar System Research in Göttingen contributed to computer simulations that led to this explanation. An international team of 42 researchers led by the University of Hawaii examined the unusual pair and presents an explanation for its existence in the journal Nature. No other planets orbiting similarly close to a red giant star are known. When Baekdu inflated in its previous expansion phase, it should have "swallowed" such a close companion. At far too close a distance, Halla orbits the red giant star Baekdu. The constellation Ursa Minor is home to a planet that cannot exist. ![]()
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