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- W248844076 abstract "We present observations that indicate viscous heating contributes significantly to the surface heating of the inner disk region (0.1-5 AU) around young intermediate-mass stars, Herbig AeBe stars, when the inner disk is optically thick. Brγ flux is known to scale with accretion rate around young stars. We find a trend between Brγ and CO emissivity, a tracer 1,500 K gas in the gaseous atmospheres of less evolved inner disk regions in a sample of 25 Herbig AeBe stars, the higher mass analog of T Tauri stars. Evolved Herbig circumstellar disks do not follow this trend as closely. A thermal chemical model of the inner disk region of T Tauri stars by Glassgold et al. (2004) explains the strength and line profiles of observed CO rovibrational emission by showing that accretion contributes significantly to heating the protoplanetary disk. This heating produces the required temperatures and column densities for CO emission in the disk. Our results are consistent with these prescribed disk characteristics. Determining conditions and processes in circumstellar disks around young stars will help inform evolutionary theory and constrain timescales of disk dissipation and planet formation. Subject headings: accretion, accretion disk — circumstellar matter — planetary systems: protoplanetary disks — stars: pre–main-sequence" @default.
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- W248844076 date "2012-07-01" @default.
- W248844076 modified "2023-09-26" @default.
- W248844076 title "CO Emission in the Inner Disk Around Young Intermediate-Mass Stars" @default.
- W248844076 hasPublicationYear "2012" @default.
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