(3200) Phaethon Polarimetry in the Negative Branch: New Evidence for the Anhydrous Nature of the DESTINY+ Target Asteroid
| Autor: | Geem, Jooyeon, Ishiguro, Masateru, Takahashi, Jun, Akitaya, Hiroshi, Kawabata, Koji S., Nakaoka, Tatsuya, Imazawa, Ryo, Mori, Fumiki, Jin, Sunho, Bach, Yoonsoo P., Jo, Hangbin, Kuroda, Daisuke, Hasegawa, Sunao, Yoshida, Fumi, Ishibashi, Ko, Sekiguchi, Tomohiko, Beniyama, Jin, Arai, Tomoko, Ikeda, Yuji, Shinnaka, Yoshiharu, Granvik, Mikael, Siltala, Lauri, Djupvik, Anlaug A., Kasikov, Anni, Pinter, Viktoria, Knudstrup, Emil |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Geem J., et al., 2022, Monthly Notices of the Royal Astronomical Society: Letters, 516, L53 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnrasl/slac072 |
| Popis: | We report on the first polarimetric study of (3200) Phaethon, the target of JAXA's DESTINY$^+$ mission, in the negative branch to ensure its anhydrous nature and to derive an accurate geometric albedo. We conducted observations at low phase angles (Sun-target-observer angle, alpha = 8.8-32.4 deg) from 2021 October to 2022 January and found that Phaethon has a minimum polarization degree $P_{min}$ = -1.3 +- 0.1 %, a polarimetric slope h = 0.22 +- 0.02 % deg$^{-1}$, and an inversion angle alpha$_0$ = 19.9 +- 0.3 deg. The derived geometric albedo is $p_V$ = 0.11 (in the range of 0.08-0.13). These polarimetric properties are consistent with anhydrous chondrites, and contradict hydrous chondrites and typical cometary nuclei. Comment: 6 pages, 2 figures, This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: 2022 Jooyeon Geem, Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. For the published version, please see https://academic.oup.com/mnrasl/article/516/1/L53/6639881 |
| Databáze: | arXiv |
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