Nano-diamonds in proto-planetary discs - Life on the edge

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Table 2

Nano-diamond, a-C, and a-C:H temperatures at 10 AU as a function of particle radius, a_d: for HR 4049, the dust temperatures are at 50 AU*.

Object				T_d(K)
a_d (nm)	0.5	1	3	10	30	100
Nano-diamonds
HR4049*	476–687	549–767	714–1094	973–1656	1769–2200	1393–1917
Elias 1	441–593	505–656	649–912	878–1430	1517–2060	1189–1624
HD 97048	532–890	626–1013	844–1523	1240–2052	2152–(2395)	1089–(2346)
Amorphous carbon: a-C [E_g = 0.1 eV]
HR4049*	1351	969	728	681	687	648
Elias 1	1114	808	579	535	538	494
HD 97048	1273	884	634	584	584	524
Hydrogenated amorphous carbon: a-C:H [E_g = 2.67 eV]
HR4049*	731	853	950	995	1089	1150
Elias 1	640	731	803	837	901	899
HD 97048	735	858	958	1009	1088	1035

Notes. Underlined temperatures, in bold face and underlined bold face indicate where the nano-diamonds are likely to be de-hydrogenated, surface-reconstructed to sp², or destroyed by sublimation, respectively, under the local conditions in the given object.

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