New Thermal Conductivity Measurements of Meteorites: Implications for Asteroid Models

Details New Thermal Conductivity Measurements of Meteorites: Implications for Asteroid Models New Thermal Conductivity Measurements of Meteorites: Implications for Asteroid Models

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.5005c&link_type=abstract

American Astronomical Society, DPS meeting #41, #50.05

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We have measured the thermal conductivity at low temperatures (5K to 300 K) of meteorites representing a range of compositions, including the ordinary chondrites Chronstad (H5) and Lumpkin (L6), the enstatite chondrite Abee (E4), the carbonaceous chondrites NWA 5515 (CK4 find) and Cold Bokkeveld (CM2), and the iron meteorite Campo del Cielo (IAB find). All measurements were made using a Quantum Design P670 TTO on samples cut into 0.5 - 1 cm prisms.
The iron meteorite conductivity increases roughly linearly from 17 W/mK at 100K to 27 W/mK at 300 K. The conductivities of all the stony samples except Abee appear to be controlled by the inhomogeneous nature of the meteorite fabric, resulting in values that are much lower than those of pure minerals and essentially independent of temperature above 100K. The L and CK sample conductivities above 100 K are both 1.5 W/mK, that of the H is 1.9 W/mK, and that of the CM sample is 0.5 W/mK; by contrast the literature value at 300 K for serpentine is 2.5 W/mK and that of enstatite and olivine is 4.5 to 5 W/mK (comparable to our Abee value). Below 100 K all materials' conductivities drop sharply.
These low thermal conductivities will have significant effects on the thermal evolution of asteroids and other small solar system bodies where the rocky component is assumed to be meteoritic. These values would indicate lower thermal inertias, potentially affecting the YORP and Yarkovsky spin/orbital evolution of small meteoroids. However, for most asteroids, thermal inertia is dominated by the dusty nature of the regolith rather than the conductivity of the material itself.

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