Estudo de pequenas bandas de absorção de gelos em espectros de objetos transnetunianos

Abstract

The region beyond Neptune (transneptunian region) has more than 1900 objects composed of ices, which are considered the most pristine objects in the solar system. To analyze these objects from the ground, we utilize reflection spectroscopy in the near infrared region. In this work we analyse 68 spectra of 50 transneptunian objects, trying to find absorption bands of the ices that were present at the time of formation of the solar system and that could tell us the story of its evolution. However, these spectra show a considerable amount of noise and to better analyze them we need to use filtering techniques to reduce the noise and better recover the absorption bands of these spec- tra. The technique that meets these requirements is the one using Wavelets. After filtering the whole sample we compare the cleaned spectra with spectra obtained from optical constants obtained in laboratory for water, methane and methanol ices for various particle sizes. After filtering and comparing a distribution analysis of ices in transneptunian region was performed. The wavelets were a versatile tool that we will use in future work. We detected some features that were hidden by the noise, nevertheless not in a number that permits us to fully study the ices distribution in the outer solar system.