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View Full Version : Twin Sn1a have different peak luminosity



trinitree88
2018-Jun-25, 02:24 PM
Sn1a are stadardizable candles. They are not standard candles. The metallicity changes the proportion of stable Fe nuclei, and hence of radioactive nickel, and these two twins vary by ~38% in their nickel content. SEE:https://arxiv.org/abs/1806.08359

pete

George
2018-Jun-26, 08:16 PM
Sn1a are stadardizable candles. They are not standard candles. The metallicity changes the proportion of stable Fe nuclei, and hence of radioactive nickel, and these two twins vary by ~38% in their nickel content. SEE:https://arxiv.org/abs/1806.08359
That's interesting.

It does seem logical that metallicity could make a difference. More 56Ni formed is brighter than less. Higher z distances have less metals, so Ho might need a tweak, though they seemed to suggest not much if any.

Looks like the more massive galaxies are taken into account for determining distances, so I assume these SNe typically have more metals, or is there another reason? But what about radial distances from the center of their galaxy where the inside track of the album plays the heavy metal beat, so to speak?

It was a little over my head. Regardless, thanks for the "paper trial"(sick).