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  Low water outgassing from (24) Themis and (65) Cybele: 3.1 μm near-IR spectral implications

O’Rourke, L., Müller, T. G., Biver, N., Bockelée-Morvan, D., Hasegawa, S., Valtchanov, I., et al. (2020). Low water outgassing from (24) Themis and (65) Cybele: 3.1 μm near-IR spectral implications. The Astrophysical Journal Letters, 898(2): L45. doi:10.3847/2041-8213/aba62b.

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O’Rourke, L., Author
Müller, T. G.1, Author              
Biver, N., Author
Bockelée-Morvan, D., Author
Hasegawa, S., Author
Valtchanov, I., Author
Küppers, M., Author
Fornasier, S., Author
Campins, H., Author
Fujiwara, H., Author
Teyssier, D., Author
Lim, T., Author
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: Asteroids (24) Themis and (65) Cybele have an absorption feature at 3.1 μm reported to be directly linked to surface water ice. We searched for water vapor escaping from these asteroids with the Herschel Space Observatory Heterodyne Instrument for the Far Infrared. While no H2O line emission was detected, we obtain sensitive 3σ water production rate upper limits of Q(H2O) < 4.1 × 1026 molecules s−1 for Themis and Q(H2O) < 7.6 × 1026 molecules s−1 for Cybele. Using a thermophysical model, we merge data from the Subaru/Cooled Mid-Infrared Camera and Spectrometer and the Herschel/Spectral and Photometric Imaging Receiver with the contents of a multi-observatory database to derive new radiometric properties for these two asteroids. For Themis, we find a thermal inertia Γ=20+25−10 J m-2 s-1/2 K-1, a diameter 192+10−7 km, and a geometric V-band albedo pV = 0.07 ± 0.01. For Cybele, we obtain a thermal inertia Γ=25+28−19 J m-2 s-1/2 K-1, a diameter 282 ± 9 km, and an albedo pV = 0.042 ± 0.005. Using all inputs, we estimate that water ice intimately mixed with the asteroids' dark surface material would cover <0.0017% (for Themis) and <0.0033% (for Cybele) of their surfaces, while an areal mixture with very clean ice (Bond albedo 0.8 for Themis and 0.7 for Cybele) would cover <2.2% (for Themis) and <1.5% (for Cybele) of their surfaces. While surface (and subsurface) water ice may exist in small localized amounts on both asteroids, it is not the reason for the observed 3.1 μm absorption feature.

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 Dates: 2020-07-31
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/2041-8213/aba62b
Other: LOCALID: 3258514
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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 898 (2) Sequence Number: L45 Start / End Page: - Identifier: ISSN: 2041-8205
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215