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SNe Ia Extinction — Systematic Bias Possibility
Narrow absorption lines from intervening material in supernovae. IV. Type Ia supernovae
Published: 12 May 2026 · Updated: 13 July 2026
Read the original sourceWhat the paper says
They interpret the correlation as 'viewing angle' effects.
The Critique
They interpret the correlation as 'viewing angle' effects, but don't explore an alternative: what if the correlation indicates a systematic underestimate of extinction in certain subpopulations? The different sodium distributions might reflect dust properties rather than geometry.
Why It Matters
SNe Ia are the primary standard candles for cosmology. If extinction corrections are systematically biased for certain subpopulations, this could affect measurements of dark energy and cosmic acceleration.
What They Missed
If true, this would affect cosmological distance measurements. They don't test the dust properties hypothesis.