Complex Organic Materials in the Circumstellar Disk of HR 4796A

Details Complex Organic Materials in the Circumstellar Disk of HR 4796A Complex Organic Materials in the Circumstellar Disk of HR 4796A

2007-12-19

arxiv.org/abs/0712.3283v1

Astronomy and Astrophysics

Astrophysics

5 pages, emulateapj, Accepted to ApJL

Scientific paper

10.1086/527546

We combine HST/NICMOS imaging photometry of the HR 4796A disk at previously unobserved wavelengths between 1.71-2.22\micron with reprocessed archival observations to produce a measure of the dust's scattering efficiency as a function of wavelength. The spectrum of the dust, synthesized from the seven photometric measures, is characterized by a steep red slope increasing from 0.5 \micron to 1.6 \micron followed by a flattening of the spectrum at wavelengths $>$ 1.6 \micron. We fit the spectrum with a model population of dust grains made of tholins, materials comprised of complex organic materials seen throughout the outer parts of our Solar System. The presence of organic material around a star that may be in the later stages of giant planet formation implies that the basic building blocks for life may be common in planetary systems.

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