On the origin of the 1.2-μm feature in type la supernova spectra

Jason Spyromilio; Philip A. Pinto; Ronald G. Eastman

doi:10.1093/mnras/266.1.L17

On the origin of the 1.2-μm feature in type la supernova spectra

Jason Spyromilio, Philip A. Pinto, Ronald G. Eastman

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22 Scopus citations

Abstract

The infrared colour evolution of type la supernovae is very uniform, exhibiting a dip in the J-H light curve approximately 30 d after maximum light. Spectroscopically, this dip has been identified with what appears as a broad absorption feature (5 x 10⁴ km s^-1) at 1.2 μm. Although many candidate transitions have been investigated in the past, no plausible species of ion or molecule has been found that can account for an absorption at this wavelength. We suggest that this 'absorption' is in fact a lack of emission caused by the absence of any significant opacity in this wavelength interval. At this epoch the supernova is merely a broad-line nebula with no lines near 1.2 μm.

Original language	English (US)
Pages (from-to)	L17-L19
Journal	Monthly Notices of the Royal Astronomical Society
Volume	266
Issue number	1
DOIs	https://doi.org/10.1093/mnras/266.1.L17
State	Published - 1991

Keywords

Infrared: Stars
Line: identification
Supernovae: Individual: SN 199IT

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/266.1.L17

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title = "On the origin of the 1.2-μm feature in type la supernova spectra",

abstract = "The infrared colour evolution of type la supernovae is very uniform, exhibiting a dip in the J-H light curve approximately 30 d after maximum light. Spectroscopically, this dip has been identified with what appears as a broad absorption feature (5 x 104 km s-1) at 1.2 μm. Although many candidate transitions have been investigated in the past, no plausible species of ion or molecule has been found that can account for an absorption at this wavelength. We suggest that this 'absorption' is in fact a lack of emission caused by the absence of any significant opacity in this wavelength interval. At this epoch the supernova is merely a broad-line nebula with no lines near 1.2 μm.",

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doi = "10.1093/mnras/266.1.L17",

language = "English (US)",

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T1 - On the origin of the 1.2-μm feature in type la supernova spectra

AU - Spyromilio, Jason

AU - Pinto, Philip A.

AU - Eastman, Ronald G.

PY - 1991

Y1 - 1991

N2 - The infrared colour evolution of type la supernovae is very uniform, exhibiting a dip in the J-H light curve approximately 30 d after maximum light. Spectroscopically, this dip has been identified with what appears as a broad absorption feature (5 x 104 km s-1) at 1.2 μm. Although many candidate transitions have been investigated in the past, no plausible species of ion or molecule has been found that can account for an absorption at this wavelength. We suggest that this 'absorption' is in fact a lack of emission caused by the absence of any significant opacity in this wavelength interval. At this epoch the supernova is merely a broad-line nebula with no lines near 1.2 μm.

AB - The infrared colour evolution of type la supernovae is very uniform, exhibiting a dip in the J-H light curve approximately 30 d after maximum light. Spectroscopically, this dip has been identified with what appears as a broad absorption feature (5 x 104 km s-1) at 1.2 μm. Although many candidate transitions have been investigated in the past, no plausible species of ion or molecule has been found that can account for an absorption at this wavelength. We suggest that this 'absorption' is in fact a lack of emission caused by the absence of any significant opacity in this wavelength interval. At this epoch the supernova is merely a broad-line nebula with no lines near 1.2 μm.

KW - Infrared: Stars

KW - Line: identification

KW - Supernovae: Individual: SN 199IT

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On the origin of the 1.2-μm feature in type la supernova spectra

Abstract

Keywords

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