In the Search for Exoplanets, Some Failures Are A Success
Astronomers used decades of archival data and new radial velocity measurements to search for exoplanets around a neaby binary star, 70 Oph AB. They didn't find any, which can seem like a failure. But in this case, their work only ruled out large, Jupiter-mass planets at certain distances. There could still be Earth-sized planets there, and their precise findings will only fuel a deeper search…
Astronomers are finding that failed attempts in the search for exoplanets can still be valuable. Powerful new telescopes are set to revolutionize exoplanet science, allowing direct imaging and atmospheric spectroscopy. But these telescopes are in high demand, so astronomers must carefully choose their targets. A new study led by researchers at the University of Michigan examines the binary star system 70 Oph AB, which is one of the most favorable targets for future direct imaging and astrometry missions.
Using radial velocity measurements, they found no evidence of Jupiter-sized planets in the system, but ruled out the possibility of exoplanets altogether. While the study's findings may be disappointing, they are scientifically valuable as they provide more data points for exoplanet science to advance. The researchers noted that the orbits of 70 Oph A and B are now the most well-understood in the sky, and the system is a target for flagship missions like NASA's Habitable Worlds Observatory.
The study has implications for habitability studies in binary stars, where even small changes in orbit can significantly impact the potential for habitable planets. The researchers emphasize that the results do not rule out the possibility of smaller planets in the system, and that the search for exoplanets should continue.
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