A transitional disk around an intermediate mass star in the sparse population of the Orion OB1 Association
作者： Catherine Espaillat , Paola D'Alessio , Jesús Hernández , Karina Maucó , Daniel Feldman
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摘要: We present a detailed study of the disk around intermediate mass star SO 411, aiming to explain spectral energy distribution this star. show that is transitional truncated at $\sim$11 au, with $\sim$0.03 lunar masses optically thin dust inside cavity. Gas also flows through cavity, since we find still accreting onto star, rate $\sim 5x10^{-9}$ Msun/yr. Until now, 411 has been thought belong $\sim$3 Myr old {$\sigma$} Orionis cluster. However, analyzed second Gaia Data Release in combination kinematic data previously reported, and found can be associated an sparse stellar population located front If case, then older even more peculiar, primordial disks range are scarce for ages $>$5 Myr. Analysis silicate 10$\mu$m feature indicates observed arises edge outer disk, displays very high crystallinity ratio $\sim$0.5, forsterite most abundant crystal. The abundance points crystal formation non-equilibrium conditions. PAH spectrum consistent state between hot luminous Herbig Ae less massive cooler T Tauri stars. 7.7$\mu$m small PAHs remain disk.
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