A year-long plateau in the late-time near-infrared light curves of type Ia supernovae

被引：0
|
作者：
O. Graur
K. Maguire
R. Ryan
M. Nicholl
A. Avelino
A. G. Riess
L. Shingles
I. R. Seitenzahl
R. Fisher
机构：
[1] Center for Astrophysics | Harvard & Smithsonian,Department of Astrophysics
[2] American Museum of Natural History,School of Physics
[3] Trinity College Dublin,Institute for Astronomy
[4] Space Telescope Science Institute,Birmingham Institute for Gravitational Wave Astronomy and School of Physics and Astronomy
[5] University of Edinburgh,Department of Physics and Astronomy
[6] University of Birmingham,Astrophysics Research Centre, School of Mathematics and Physics
[7] The Johns Hopkins University,School of Science
[8] Queen’s University Belfast,Department of Physics
[9] University of New South Wales,undefined
[10] Australian Defense Force Academy,undefined
[11] University of Massachusetts Dartmouth,undefined
来源：
Nature Astronomy | 2020年 / 4卷
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摘要：
The light curves of type Ia supernovae are routinely used to constrain cosmology models. Driven by radioactive decay of 56Ni, the light curves steadily decline over time, but after 150 d post-explosion the near-infrared portion is poorly characterized. We report a year-long plateau in the near-infrared light curve at 150–500 d, followed by a second decline phase accompanied by a possible appearance of [Fe i] emission lines. This near-infrared plateau contrasts sharply with type IIP plateaux and requires a new physical mechanism. We suggest a masking of the ‘near-infrared catastrophe’—a predicted, yet unobserved, sharp light-curve decline—by scattering of ultraviolet photons to longer wavelengths. The transition off the plateau could be due to a change in the dominant ionization state of the supernova ejecta. Our results help explain the complex radiative transfer processes that take place in type Ia supernovae and enhance their use as ‘standard candles’.
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页码：188 / 195
页数：7
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