Accepted Young-Planet Study
Four years of spectra sharpen the weights of infant planets
More than 380 HARPS-N observations favor giant-planet masses for V1298 Tau b and e in some models, while exposing how stellar activity controls the answer.
Briefed September 25, 2026 · Aliens in the Clouds
Long-Baseline Spectroscopy · Model-Sensitive Masses
The roughly 20-million-year-old star V1298 Tau hosts four confirmed transiting planets, making it a rare test of how young worlds contract and evolve. Researchers analyzed more than 380 high-resolution HARPS-N spectra gathered over 4.5 years, combining N-body dynamics, two radial-velocity extraction methods, transit-timing information, and multidimensional Gaussian-process models for the star's intense magnetic activity.
Several specific model configurations return 3.5-to-4-sigma mass measurements for planets b and e in the broad range of about 0.4 to 0.8 Jupiter masses—higher than recent transit-timing-only estimates that suggested unusually low-density, super-puffy worlds. Injection-and-recovery tests give moderate support for b, while c and d receive updated upper limits. The accepted paper explicitly calls the analysis exploratory: the inferred masses change with the velocity extraction and activity diagnostics, so this is a sharpened constraint rather than a final weighing.
Why it matters
Reliable masses for planets this young test whether giant worlds begin inflated, lose atmosphere quickly, or follow evolutionary tracks inferred mainly from mature systems.
What the source establishes
Accepted A&A analysis of a homogeneous 4.5-year dataset. Some model choices produce significant masses for b and e; sensitivity to stellar-activity treatment remains a central limitation.
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