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  Coma Anisotropy and the Rotation Pole of Interstellar Comet 2I/Borisov

Kim, Y., Jewitt, D., Mutchler, M., Agarwal, J., Hui, M.-T., & Weaver, H. (2020). Coma Anisotropy and the Rotation Pole of Interstellar Comet 2I/Borisov. Astrophysical Journal, Letters, 895(2): L34. doi:10.3847/2041-8213/ab9228.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-D1EC-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-D1ED-3
Genre: Journal Article

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 Creators:
Kim, Y.1, Author
Jewitt, D., Author
Mutchler, M., Author
Agarwal, Jessica2, Author              
Hui, M.-T., Author
Weaver, H., Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              
2Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: Hubble Space Telescope observations of interstellar comet 2I/Borisov near perihelion show the ejection of large (gsim; 100 μm) particles at ≲9 m s-1 speeds, with estimated mass-loss rates of ∼35 kg s-1. The total mass loss from comet Borisov corresponds to loss of a surface shell on the nucleus only ∼0.4 m thick. This shell is thin enough to be susceptible to past chemical processing in the interstellar medium by cosmic rays, meaning that the ejected materials cannot necessarily be considered as pristine. Our high-resolution images reveal persistent asymmetry in the dust coma, best explained by a thermal lag on the rotating nucleus causing peak mass loss to occur in the comet nucleus afternoon. In this interpretation, the nucleus rotates with an obliquity of 30°(pole direction R.A. = 205° and decl. = 52°. The subsolar latitude varied from -35° (southern solstice) at the time of discovery to 0° (equinox) in 2020 January, suggesting the importance of seasonal effects. Subsequent activity likely results from regions freshly activated as the northern hemisphere is illuminated for the first time.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/2041-8213/ab9228
 Degree: -

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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
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Publ. Info: Bristol, UK : Institute of Physics Publishing (IOP)
Pages: - Volume / Issue: 895 (2) Sequence Number: L34 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_1