Examples of circumstellar

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The third chapter on the search for extrasolar planets discusses the different search methods and includes a section on circumstellar disk observations.
Cyanopolyynes: carbon chains formation in a carbon arc mimicking the formation of carbon chains in the circumstellar medium.
The carbon vapour ejected into the circumstellar medium by the carbon-rich giant stars is made by polyynes chains.
Such a macroscopic drift seems to be unavoidable in the context of circumstellar disks (see the next section).
The self-magnetisation of circumstellar disks is considered within an appropriate multifluid description.
It is also worth mentioning that reasonable relative flows will result in magnetic fields associated with electric currents that flow in the circumstellar disks.
In this contribution, we consider as an important application the magnetisation of circumstellar accretion disks.
Chondrites also contain minor components that have distinct origins : over the past 20 years, interstellar and circumstellar grains have been separated from meteorites.
In any case, the molecules formed in the circumstellar environment are the same as those incorporated in comets and later delivered to planets by bombardment.
Several earlier examples of circumstellar discs are known, including a significantly narrow one around an eight-million-year-old star.
We show that circumstellar disks can carry their own significant magnetic fields.
Both inorganic and organic molecules and solids are found to form in the circumstellar envelopes created by stellar winds.
In the circumstellar environment it has been proposed that the formation of these long and unsaturated carbon chains takes place mainly by a radical mechanism involving neutral species.
Instead, the surface of the star was likely polluted by circumstellar material, such as by the remains of a rocky, terrestrial planet.
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