The thermal emission from boulders on (25143) Itokawa and general implications for the YORP effect

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10315320" target="_blank" >RIV/00216208:11320/15:10315320 - isvavai.cz</a>
Alternative codes found
RIV/67985815:_____/15:00450587
Result on the web
<a href="http://dx.doi.org/10.1093/mnras/stv738" target="_blank" >http://dx.doi.org/10.1093/mnras/stv738</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stv738" target="_blank" >10.1093/mnras/stv738</a>

Result language
angličtina
Original language name
The thermal emission from boulders on (25143) Itokawa and general implications for the YORP effect
Original language description
Infrared radiation emitted from an asteroid surface causes a torque that can significantly affect rotational state of the asteroid. The influence of small topographic features on this phenomenon, called the YORP effect, seems to be of utmost importance.In this work, we show that a lateral heat diffusion in boulders of suitable sizes leads to an emergence of a local YORP effect which magnitude is comparable to the YORP effect due to the global shape. We solve a three-dimensional heat diffusion equationin a boulder and its surroundings by the finite element method, using the FREEFEM++ code. The contribution to the total torque is inferred from the computed temperature distribution. Our general approach allows us to compute the torque induced by a realistic irregular boulder. For an idealized boulder, our result is consistent with an existing one-dimensional model. We also estimated (and extrapolated) a size distribution of boulders on (25143) Itokawa from close-up images of its surface
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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