The effects of ablation on the cross section of planetary envelopes at capturing planetesimals
We explore the cross section of giant planet envelopes at capturing planetesimals of different sizes. For this purpose we employ two sets of realistic planetary envelope models (computed assuming for the protoplanetary nebula masses of 10 and 5 times the mass of the minimum mass solar nebula), accou...
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I19R12010915209420230921T20:06:29Z http://sedici.unlp.edu.ar/handle/10915/2094 The effects of ablation on the cross section of planetary envelopes at capturing planetesimals Benvenuto, Omar Gustavo Brunini, Adrián 2008 20101005T03:00:00Z en Ciencias Astronómicas accretion planetary formation planetesimals We explore the cross section of giant planet envelopes at capturing planetesimals of different sizes. For this purpose we employ two sets of realistic planetary envelope models (computed assuming for the protoplanetary nebula masses of 10 and 5 times the mass of the minimum mass solar nebula), account for drag and ablation effects and study the trajectories along which planetesimals move. The core accretion of these models has been computed in the oligarchic growth regime [Fortier, A., Benvenuto, O.G., Brunini, A., 2007. Astron. Astrophys. 473, 311 322], which has also been considered for the velocities of the incoming planetesimals. This regime predicts velocities larger that those used in previous studies of this problem. As the rate of ablation is dependent on the third power of velocity, ablation is more important in the oligarchic growth regime. We compute energy and mass deposition, fractional ablated masses and the total cross section of planets for a wide range of values of the critical parameter of ablation. In computing the total cross section of the planet we have included the contributions due to mass deposited by planetesimals moving along unbound orbits. Our results indicate that, for the case of small planetary cores and low velocities for the incoming planetesimals, ablation has a negligible impact on the capture cross section in agreement with the results presented in Inaba and Ikoma [Inaba, S., Ikoma, M., 2003. Astron. Astrophys. 410, 711 723]. However for the case of larger cores and high velocities of the incoming planetesimals as predicted by the oligarchic growth regime, we find that ablation is important in determining the planetary cross section, being several times larger than the value corresponding ignoring ablation. This is so regardless of the size of the incoming planetesimals. Facultad de Ciencias Astronómicas y Geofísicas Articulo Articulo http://creativecommons.org/licenses/byncnd/4.0/ Creative Commons AttributionNonCommercialNoDerivatives 4.0 International (CC BYNCND 4.0) application/pdf 882894 
institution 
Universidad Nacional de La Plata 
institution_str 
I19 
repository_str 
R120 
collection 
SEDICI (UNLP) 
language 
Inglés 
topic 
Ciencias Astronómicas accretion planetary formation planetesimals 
spellingShingle 
Ciencias Astronómicas accretion planetary formation planetesimals Benvenuto, Omar Gustavo Brunini, Adrián The effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
topic_facet 
Ciencias Astronómicas accretion planetary formation planetesimals 
description 
We explore the cross section of giant planet envelopes at capturing planetesimals of different sizes. For this purpose we employ two sets of realistic planetary envelope models (computed assuming for the protoplanetary nebula masses of 10 and 5 times the mass of the minimum mass solar nebula), account for drag and ablation effects and study the trajectories along which planetesimals move. The core accretion of these models has been computed in the oligarchic growth regime [Fortier, A., Benvenuto, O.G., Brunini, A., 2007. Astron. Astrophys. 473, 311 322], which has also been considered for the velocities of the incoming planetesimals. This regime predicts velocities larger that those used in previous studies of this problem. As the rate of ablation is dependent on the third power of velocity, ablation is more important in the oligarchic growth regime. We compute energy and mass deposition, fractional ablated masses and the total cross section of planets for a wide range of values of the critical parameter of ablation. In computing the total cross section of the planet we have included the contributions due to mass deposited by planetesimals moving along unbound orbits. Our results indicate that, for the case of small planetary cores and low velocities for the incoming planetesimals, ablation has a negligible impact on the capture cross section in agreement with the results presented in Inaba and Ikoma [Inaba, S., Ikoma, M., 2003. Astron. Astrophys. 410, 711 723]. However for the case of larger cores and high velocities of the incoming planetesimals as predicted by the oligarchic growth regime, we find that ablation is important in determining the planetary cross section, being several times larger than the value corresponding ignoring ablation. This is so regardless of the size of the incoming planetesimals. 
format 
Articulo Articulo 
author 
Benvenuto, Omar Gustavo Brunini, Adrián 
author_facet 
Benvenuto, Omar Gustavo Brunini, Adrián 
author_sort 
Benvenuto, Omar Gustavo 
title 
The effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
title_short 
The effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
title_full 
The effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
title_fullStr 
The effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
title_full_unstemmed 
The effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
title_sort 
effects of ablation on the cross section of planetary envelopes at capturing planetesimals 
publishDate 
2008 
url 
http://sedici.unlp.edu.ar/handle/10915/2094 
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