Abstract

JACK, Dennis. A method for telluric line removal from supernova and nova spectra. Rev. mex. astron. astrofis [online]. 2017, vol.53, n.1, pp.141-149. ISSN 0185-1101.

We present a new method for removing telluric lines from high resolution supernova and nova spectra. This simple and quick method has the advantage of also eliminating any interstellar and intergalactic absorption features, and it smoothens the spectra removing noise and any possible cosmic-ray hits. The method identifies narrow lines in the very broad features of supernova and nova spectra and removes all of them. We applied the method to observed high resolution (R ≈ 20,000) spectra of the type Ia supernova SN 2014J and performed a study of the effects of telluric lines in low resolution spectra of this supernova. The differences in flux can be around 25% in some wavelength ranges with broad telluric bands. In addition, we demonstrate that this method can also be applied to high resolution spectra of novae and present as an example the telluric line removal in the spectra of Nova V5668 Sgr.

Keywords : atmospheric effects-novae; cataclysmic variables-supernovae: general - techniques: spectroscopic.

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