Heat capacities of ordinary chondrite falls below 300 K

1Robert J. MACKE,2Cyril OPEIL,1Guy J. CONSOLMAGNO
Meteoritics & Planetary Society (in Press) Link to Article [https://doi.org/10.1111/maps.13385]
Vatican Observatory, V-00120 Vatican City-State2Department of Physics, Boston College, Chestnut Hill, Massachusetts 02215, USA
Published by arrangement with John Wiley & Sons

Low-temperature specific heat capacities of meteorites provide valuable data forunderstanding the composition and evolution of meteorites and modeling the thermalbehavior of their source asteroids. By liquid nitrogen immersion, we measured average low-temperature heat capacities for 60 ordinary chondrite falls from the Vatican collection. Wefurther characterized the temperature dependence of ordinary chondrite by directmeasurement of Cp(T) over the range 5–320 K for five OC falls, coupled by composition-based models for 94 ordinary chondrites. We find that the heat capacity as a function oftemperature for typical ordinary chondrites can be closely approximated by a third-orderpolynomial in temperature. Furthermore, those polynomial coefficients can be estimatedfrom the single-value average heat capacity measurement. These measurements haveimportant implications for the orbital and spin evolution of S- and Q-type asteroids via thevarious Yarkovsky effects and the thermal evolution of meteorite parent bodies.

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