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• W4386477477 endingPage "147" @default.
• W4386477477 startingPage "147" @default.
• W4386477477 abstract "Abstract The accretion of material from protoplanetary disks onto their central stars is a fundamental process in the evolution of these systems and a key diagnostic in constraining the disk lifetime. We analyze the relationship between the stellar accretion rate and the disk mass in 32 intermediate-mass Herbig Ae/Be systems and compare them to their lower-mass counterparts, T Tauri stars. We find that the <?CDATA $dot{M}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mover accent=true> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>̇</mml:mo> </mml:mrow> </mml:mover> </mml:math> – M disk relationship for Herbig Ae/Be stars is largely flat at ∼10 −7 M ☉ yr −1 over 3 orders of magnitude in dust mass. While most of the sample follows the T Tauri trend, a subset of objects with high accretion rates and low dust masses are identified. These outliers (12 out of 32 sources) have an inferred disk lifetime of less than 0.01 Myr and are dominated by objects with low infrared excess. This outlier sample is likely identified in part by the bias in classifying Herbig Ae/Be stars, which requires evidence of accretion that can only be reliably measured above a rate of ∼10 −9 M ☉ yr −1 for these spectral types. If the disk masses are not underestimated and the accretion rates are not overestimated, this implies that these disks may be on the verge of dispersal, which may be due to efficient radial drift of material or outer disk depletion by photoevaporation and/or truncation by companions. This outlier sample likely represents a small subset of the larger young, intermediate-mass stellar population, the majority of which would have already stopped accreting and cleared their disks." @default.
• W4386477477 created "2023-09-07" @default.
• W4386477477 creator A5015425497 @default.
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• W4386477477 creator A5076646665 @default.
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• W4386477477 creator A5047952411 @default.
• W4386477477 date "2023-09-06" @default.
• W4386477477 modified "2023-10-14" @default.
• W4386477477 title "The Ṁ –M _disk Relationship for Herbig Ae/Be Stars: A Lifetime Problem for Disks with Low Masses?" @default.
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