Origin of supernovae of type Ia increased luminosity

(ORDO NEWS) — In a new study led by a team led by Dr. Chu Jia Zhang (Zhang Jujia) of the Yunnan Observatories of the Chinese Academy of Sciences, the main properties of supernovae of increased luminosity of type Ia, detected by observations, were interpreted by the excess of nickel in the obtained spectra.

This study was carried out as part of the Lijiang One hour per Night Supernova program (LiONS).

Type Ia supernovae are usually considered as the result of the explosion of a carbon-oxygen white dwarf that is part of a binary system. Their high and easily normalizable luminosity makes these objects excellent reference points for measuring cosmic distances.

Based on the role of Type Ia supernovae in measurements of cosmic distances, they provide evidence that the expansion of space is accelerating, and therefore help to complement the balance of mass and energy of the Universe, which is currently dominated by dark energy.

Type Ia supernovae are an important cosmographic tool, and in the near future they should help track the evolutionary changes in the equation of state of dark energy over cosmological time intervals.

Therefore, increasing the accuracy of measuring cosmic distances using type Ia supernovae is an important task for modern astronomy. However, some type Ia supernovae, which are more luminous than predicted based on the empirical relationship, reduce the accuracy of measuring cosmic distances.

The LiONS project team obtained important data on the type Ia supernova SN 2015bq using a high-speed survey that was taken using the 2.4-meter Lijiang Telescope.

The authors found increased amounts of nickel in the spectra corresponding to material emissions from the source, absorption at a high degree of ionization, as well as a monotonic evolution in the color change curves.

All of these indications indicated that the combined interpretation of conventional spectra and elevated amounts of nickel in the ejecta of material could help determine the nature of hype luminous Type Ia supernovae.

In this work, the authors found that type Ia supernovae of increased luminosity can have the same formation mechanism as normal type Ia supernovae. Significant differences are revealed in the structure and composition of the outer layers of material emissions, they conclude.


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