Obliquity dependence of the tangential YORP

Context. The tangential Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) effect is a thermophysical effect that can alter the rotation rate of asteroids and is distinct from the so-called normal YORP effect, but to date has only been studied for asteroids with zero obliquity. Aims. We aim to study the t...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2016-08, Vol.592, p.A115
Main Authors: Ševeček, P., Golubov, O., Scheeres, D. J., Krugly, Yu. N.
Format: Article
Language:English
Subjects:
Asteroids
asteroids: general
Astronomy
Boulders
Computer simulation
Mathematical analysis
Mathematical models
methods: numerical
minor planets
Recoil
Thermal conductivity
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Summary:Context. The tangential Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) effect is a thermophysical effect that can alter the rotation rate of asteroids and is distinct from the so-called normal YORP effect, but to date has only been studied for asteroids with zero obliquity. Aims. We aim to study the tangential YORP force produced by spherical boulders on the surface of an asteroid with an arbitrary obliquity. Methods. A finite element method is used to simulate heat conductivity inside a boulder, to find the recoil force experienced by it. Then an ellipsoidal asteroid uniformly covered by these types of boulders is considered and the torque is numerically integrated over its surface. Results. Tangential YORP is found to operate on non-zero obliquities and decreases by a factor of two for increasing obliquity.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201628746