J/ApJS/179/451 Predicted IR excesses for protoplanetary disks (Kenyon+, 2008)
Variations on debris disks: icy planet formation at 30-150 AU for 1-3 M☉
main-sequence stars.
Kenyon S.J., Bromley B.C.
<Astrophys. J. Suppl. Ser., 179, 451-483 (2008)>
=2008ApJS..179..451K 2008ApJS..179..451K
ADC_Keywords: Models, evolutionary
Keywords: circumstellar matter - infrared: stars - planetary systems
solar system: formation - stars: formation
Abstract:
We describe calculations for the formation of icy planets and debris
disks at 30-150AU around 1-3M☉ stars. Debris disk formation
coincides with the formation of planetary systems. As protoplanets
grow, they stir leftover planetesimals to large velocities. A cascade
of collisions then grinds the leftovers to dust, forming an observable
debris disk. Stellar lifetimes and the collisional cascade limit the
growth of protoplanets. The maximum radius of icy planets,
rmax∼1750km, is remarkably independent of initial disk mass, stellar
mass, and stellar age. These objects contain ≤3%-4% of the initial
mass in solid material. Collisional cascades produce debris disks with
maximum luminosity ∼2x10-3 times the stellar luminosity. The peak
24um excess varies from ∼1% times the stellar photospheric flux for
1M☉ stars to ∼50 times the stellar photospheric flux for
3M☉ stars. The peak 70-850um excesses are ∼30-100 times the
stellar photospheric flux. For all stars, the 24-160um excesses rise
at stellar ages of 5-20Myr, peak at 10-50Myr, and then decline. The
decline is roughly a power law, f∝t-n with n∼0.6-1.0. This
predicted evolution agrees with published observations of A-type and
solar-type stars. The observed far-IR color evolution of A-type stars
also matches model predictions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 39 150 Predicted excesses for disks around 1M☉ stars
table5.dat 39 135 Predicted excesses for disks around 1.5M☉ stars
table6.dat 39 123 Predicted excesses for disks around 2.0M☉ stars
table7.dat 39 114 Predicted excesses for disks around 2.5M☉ stars
table8.dat 39 105 Predicted excesses for disks around 3.0M☉ stars
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See also:
J/ApJ/636/1098 : Debris disks around solar-type stars (Bryden+, 2006)
J/ApJ/660/1556 : Characterization of dusty debris disks (Rhee+, 2007)
Byte-by-byte Description of file: table[45678].dat
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Bytes Format Units Label Explanations
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1- 4 F4.2 --- xm Scaling factor of the mass surface density
6- 9 F4.2 [yr] logt Log of the time
11- 15 F5.2 [-] logLd Log of the relative dust luminosity
17- 21 F5.3 [-] logF24 Log of the relative disk flux at 24microns
23- 27 F5.3 [-] logF70 Log of the relative disk flux at 70microns
29- 33 F5.3 [-] logF160 Log of the relative disk flux at 160microns
35- 39 F5.3 [-] logF850 Log of the relative disk flux at 850microns
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Sep-2009