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A phoenix planet rises from the ashes of its dead star

A phoenix planet rises from the ashes of its dead star

Astronomers led by the University of Warwick detected near the white dwarf HS 0209+0832 a rare phoenix planet that appears to have formed from the remains of…

--- The context --- Stars, like everything that shines, have an ending. When a star similar in size to the Sun runs out of fuel, its core collapses on itself and leaves behind a white dwarf: an extremely dense object with immense gravity, capable of pulling in material from planets still orbiting around it. Until now, astronomers took for granted that the death of a star was also the death of its planetary system. A rare phoenix planet spotted near a white dwarf has just challenged that certainty. --- The facts --- The discovery, published in the journal Nature Astronomy and led by the British University of Warwick, describes a planet that appears to have formed from the remains of its already dead star, according to the researchers coordinated by Boris Gänsicke. The study shows that second-generation planets can also form around very common types of stars. The decisive clue appeared in the atmosphere of the star HS 0209+0832, where the team detected a highly unusual chemical signature: strangely heavy elements such as zinc, copper and niobium, which are only produced during the death of a star. Data from the TESS space telescope, operated by the American space agency, added more evidence: a brightness signal coming directly from the planet, repeating every 4.4 days and consistent with a Jupiter-sized gas giant in a very tight orbit, always showing the same face to the star. --- The positions --- The team's reading is as bold as it is elegant: at such extreme closeness, the planet's outer atmosphere should evaporate under the intense radiation and the material would fall back onto the white dwarf's surface, producing the observed chemical signature. In other words, the white dwarf may be feeding on a giant planet born from its own ashes. The finding also raises questions about the future of the Solar System: perhaps the Sun's ashes will also give rise to new planets when our star dies. What looked like a cosmic ending could actually be the beginning of another story. --- What remains unknown --- The planet's exact composition and the precise mechanism by which it could have formed from stellar remains are still unknown, as is how many worlds like this one remain hidden around other white dwarfs, which rank among the most common stars in the galaxy. --- Unanswered questions --- How many second-generation planets orbit white dwarfs without having been detected? What does this case tell us about the final fate of the Solar System when the Sun dies? And what other cosmic processes do we consider impossible only because we have not observed them yet? --- EPM analysis --- More than an astronomical curiosity, the phoenix planet is a reminder of why science needs boldness: to look where nobody expected to find anything and let itself be surprised by the impossible. Every time an instrument overcomes a theoretical prejudice, the universe becomes a little larger and a little stranger. 📌 EPM Take: In EPM's view, this discovery sums up why looking at the sky remains one of the most human adventures of humankind: a dead star, a planet that should not exist, and a question that includes us, because the Sun will also die one day and may leave fertile ashes in its wake. The science that imagines cosmic second chances is the same science that teaches us to never write anything off.
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