Thermal inertia and surface roughness of Comet 9P/Tempel 1

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Davidsson, Björn J. R.Uppsala universitet,Teoretisk astrofysik (author)

Thermal inertia and surface roughness of Comet 9P/Tempel 1

Article/chapterEnglish2013

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Elsevier BV,2013
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LIBRIS-ID:oai:DiVA.org:uu-201241
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-201241URI
https://doi.org/10.1016/j.icarus.2013.02.008DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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Re-calibrated near-infrared spectroscopy of the resolved nucleus of Comet 9P/Tempel 1 acquired by the Deep Impact spacecraft has been analyzed by utilizing the post-Stardust-NExT nucleus shape model and spin pole solution, as well as a novel thermophysical model that explicitly accounts for small-scale surface roughness and thermal inertia. We find that the thermal inertia varies measurably across the surface, and that thermal emission from certain regions only can be reproduced satisfactory if surface roughness is accounted for. Particularly, a scarped/pitted terrain that experienced morning sunrise during the flyby is measurably rough (Hapke mean slope angle similar to 45 degrees) and has a thermal inertia of at most 50J m(-2) K-1 s(-1/2), but probably much lower. However, thick layered terrain and thin layered terrain experiencing local noon during the flyby have a substantially larger thermal inertia, reaching 150J m(-2) K-1 s(-1/2) if the surface is as rough as the scarped/pitted terrain, but 200J m(-2) K-1 s(-1/2) if the terrain is considered locally flat. Furthermore, the reddening of the nucleus near-infrared 1.5-2.2 gm spectrum varies between morphological units, being reddest for thick layered terrain (median value 3.4% k angstrom(-1)) and most neutral for the smooth terrain known to contain surface water ice (median value 3.1% k angstrom(-1)). Thus, Comet 9P/Tempel 1 is heterogeneous in terms of both thermophysical and optical properties, due to formation conditions and/or post-formation processing.

Subject headings and genre

Comets
Nucleus
Thermal histories
Infrared observations

Added entries (persons, corporate bodies, meetings, titles ...)

Gutierrez, Pedro J. (author)
Groussin, Olivier (author)
A'Hearn, Michael F. (author)
Farnham, Tony (author)
Feaga, Lori M. (author)
Kelley, Michael S. (author)
Klaasen, Kenneth P. (author)
Merlin, Frederic (author)
Protopapa, Silvia (author)
Rickman, HansUppsala universitet,Teoretisk astrofysik(Swepub:uu)hansrick (author)
Sunshine, Jessica M. (author)
Thomas, Peter C. (author)
Uppsala universitetTeoretisk astrofysik (creator_code:org_t)

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In:Icarus: Elsevier BV224:1, s. 154-1710019-10351090-2643

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By the author/editor: Davidsson, Björn ...; Gutierrez, Pedro ...; Groussin, Olivie ...; A'Hearn, Michael ...; Farnham, Tony; Feaga, Lori M.; show more...; Kelley, Michael ...; Klaasen, Kenneth ...; Merlin, Frederic; Protopapa, Silvi ...; Rickman, Hans; Sunshine, Jessic ...; Thomas, Peter C.; show less...

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