Abstract:

Planetary explorations have revealed that complex organics are widely
present in the Solar System. Infrared spectroscopic observations have
discovered that complex organics are synthesized in large quantities
in planetary nebulae and distributed throughout the Galaxy. Signatures
of organics are found in distant galaxies, as early as 1.5 billion
years after the Big Bang. A number of unsolved spectral phenomena such
as diffuse interstellar bands, extended red emissions, 220 nm feature,
and unidentified infrared emission bands are likely to originate from
organics. In this talk, we will discuss what are the possible chemical
structures of the carriers of these phenomena, and how these organics
are synthesized abiotically in the Universe.