TESS finds 24+ planets orbiting binaries

Circumbinary planets are planets that orbit two stars instead of one. They’re the real-life version of the “two suns” idea people associate with Tatooine — b(science.nasa.gov)ht only the easy cases, where the planet happened to cross in front of the stars from our point of view. The news is that a team using NASA’s TESS data says i(arxiv.org)s by looking for a different signal entirely. (science.nasa.gov) each other, eclipse each other, and constantly change the light curve. Add a planet, and the timing and geometry get weird fast. That makes the clean, repeating dimming signal astronomers love much harder to spot than it is around a single star. (science.nasa.gov) ### How were these candidates found? Not by watching the planet pass in front of a star. The team looked at eclipsing binaries — pairs of stars that regularly pass in front (science.nasa.gov) The idea is simple: if something else is tugging on the system, the binary’s orbit can slowly precess, which shifts the eclipse timing. (science.nasa.gov) ### What did they actually report? The paper says the researchers analyzed TESS photome(science.nasa.gov)cumbinary planets and 6 additional candidate companions with higher minimum masses — meaning some of those heavier objects could be brown dwarfs or something planet-adjacent rather than clean planet calls. (arxiv.org) ### Why is “candidate” doing so much work here? Because this is an indirect detection. The excess precession tells you that *something* is perturbing the stars, but it does not pin (science.nasa.gov)r out. The paper is explicit that radial-velocity follow-up is one of the main ways to break that degeneracy and confirm what’s really there. (arxiv.org) ### So is this bigger than the old sample? Yes — potentially by a lot. NASA’s explainer says that before this study, Kepler and other facilities had logged 16 transiting worlds around binary stars, and TESS had added 2 more. Tha(arxiv.org)ill tiny. A batch of 27 candidates doesn’t instantly rewrite the census, but it dramatically expands the list of systems worth checking. (science.nasa.gov) ### Why does the method matter more than the raw count? Because transit searches are biased toward neat, aligned systems. If a planet’s orbit is tilted relative to the binary, it may nev(arxiv.org)t survey can miss it completely. A precession-based search is basically a way to look for the planet’s gravitational fingerprints instead of waiting for perfect geometry. (science.nasa.gov) ### What could this change in planet science? It could tell astronomers whether planets around binary stars usually f(science.nasa.gov)c question of how common these systems really are. Right now, the known sample is so skewed toward easy-to-see cases that it’s hard to know whether the apparent pattern is real or just observational bias. (science.nasa.gov) ### What’s the bottom line? The headline is not “TESS confirmed 27 new Tato(science.nasa.gov)ethod that can see beyond the old transit bias. If follow-up holds up, the field may be about to go from a handful of oddly convenient systems to an actual population. (science.nasa.gov)