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The Astrophysical Journal· 2026Q1

The LBT Y p Project. I. An Improved Determination of the Primordial Helium Abundance—Project Description, Sample Selection, Observations, and Methodology

Evan D. Skillman, Richard W. Pogge, Erik Aver, Noah S. J. Rogers et al.

Short summary

A new program using the Large Binocular Telescope (LBT) and an improved analysis methodology aims to determine the primordial helium abundance (Yp) with ~0.5% precision, sufficient to constrain the effective number of neutrino families to ~3%.

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Field: Astronomy and Astrophysics

Astronomy and AstrophysicsPhysics and Astronomy