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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/67985815:_____/15:00450587

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

450

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

2104-2115

Kód UT WoS článku

000356338500075

EID výsledku v databázi Scopus

2-s2.0-84923236347