(3200) Phaethon polarimetry in the negative branch: new evidence for the anhydrous nature of the <i>DESTINY</i>+ target asteroid-Reference-Cited by-同舟云学术

(3200) Phaethon polarimetry in the negative branch: new evidence for the anhydrous nature of the DESTINY+ target asteroid

Published:2022-07-11 Issue:1 Volume:516 Page:L53-L57
ISSN:1745-3925
Container-title:Monthly Notices of the Royal Astronomical Society: Letters
language:en
Short-container-title:

Author:

Geem Jooyeon¹²,Ishiguro Masateru¹²^ORCID,Takahashi Jun³,Akitaya Hiroshi⁴^ORCID,Kawabata Koji S⁵^ORCID,Nakaoka Tatsuya⁵,Imazawa Ryo⁶,Mori Fumiki⁶,Jin Sunho¹²,Bach Yoonsoo P¹²,Jo Hangbin¹²,Kuroda Daisuke⁷,Hasegawa Sunao⁸^ORCID,Yoshida Fumi⁴⁹,Ishibashi Ko⁴,Sekiguchi Tomohiko¹⁰,Beniyama Jin¹¹¹²^ORCID,Arai Tomoko⁴,Ikeda Yuji¹³¹⁴,Shinnaka Yoshiharu¹³,Granvik Mikael¹⁵¹⁶,Siltala Lauri¹⁵,Djupvik Anlaug A¹⁷¹⁸,Kasikov Anni¹⁷¹⁸¹⁹^ORCID,Pinter Viktoria¹⁷¹⁸²⁰,Knudstrup Emil¹⁷¹⁸^ORCID

Affiliation:

1. Department of Physics and Astronomy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea

2. SNU Astronomy Research Center, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea

3. Center for Astronomy, University of Hyogo , 407-2 Nishigaichi, Sayo, Hyogo 679-5313, Japan

4. Planetary Exploration Research Center, Chiba Institute of Technology , 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan

5. Hiroshima Astrophysical Science Center, Hiroshima University , Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan

6. Department of Physics, Graduate School of Advanced Science and Engineering, Hiroshima University , Kagamiyama, 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan

7. Okayama Observatory, Kyoto University , 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan

8. Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA) , Sagamihara, Kanagawa 252-5210, Japan

9. School of Medicine, University of Occupational and Environmental Health , 1-1 Iseigaoka, Yahata, Kitakyusyu 807-8555, Japan

10. Asahikawa Campus, Hokkaido University of Education , Hokumon, Asahikawa, Hokkaido 070-8621, Japan

11. Institute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan

12. Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

13. Koyama Astronomical Observatory, Kyoto Sangyo University , Motoyama, Kamigamo, Kita-Ku, Kyoto, Kyoto 603-8555, Japan

14. Photocoding , 460-102 Iwakura-Nakamachi, Sakyo-ku, Kyoto 606-0025, Japan

15. Department of Physics, University of Helsinki , PO. Box 64, FI-00014 Helsinki, Finland

16. Asteroid Engineering Laboratory, Luleå University of Technology , Box 848, SE-98128 Kiruna, Sweden

17. Nordic Optical Telescope , Rambla José Ana Fernández Pérez 7, ES-38711 Breña Baja, Spain

18. Department of Physics and Astronomy, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark

19. Tartu Observatory, University of Tartu , Observatooriumi 1, Tõravere 61602, Estonia

20. Physics Department, University of Craiova , Alexandru Ioan Cuza 13, 200585 Craiova, Romania

Abstract

ABSTRACT 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, α = 8.8–32.4°) from 2021 October to 2022 January and found that Phaethon has a minimum polarization degree Pmin = −1.3 ± 0.1 per cent, a polarimetric slope h = 0.22 ± 0.02 per cent deg−1, and an inversion angle α0 = 19.9 ± 0.3°. The derived geometric albedo is pV = 0.11 (in the range of 0.08–0.13). These polarimetric properties are consistent with anhydrous chondrites, contradict hydrous chondrites, and typical cometary nuclei.

Funder

NRF

MEST

MEXT

ISAS

JAXA

JSPS

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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