FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids

Chan Kao Chang; Ying Tung Chen; Wesley C. Fraser; Matthew J. Lehner; Shiang Yu Wang; Mike Alexandersen; Young Jun Choi; A. Paula Granados Contreras; Takashi Ito; Youngmin Jeongahn; Jianghui Ji; J. J. Kavelaars; Myung Jin Kim; Samantha M. Lawler; Jian Li; Zhong Yi Lin; Patryk Sofia Lykawka; Hong Kyu Moon; Surhud More; Marco Muñoz-Gutiérrez; Keiji Ohtsuki; Rosemary E. Pike; Tsuyoshi Terai; Seitaro Urakawa; Fumi Yoshida; Hui Zhang; Haibin Zhao; Ji Lin Zhou

doi:10.3847/1538-4365/ac50ac

FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids

Chan Kao Chang, Ying Tung Chen, Wesley C. Fraser, Matthew J. Lehner, Shiang Yu Wang, Mike Alexandersen, Young Jun Choi, A. Paula Granados Contreras, Takashi Ito, Youngmin Jeongahn, Jianghui Ji, J. J. Kavelaars, Myung Jin Kim, Samantha M. Lawler, Jian Li, Zhong Yi Lin, Patryk Sofia Lykawka, Hong Kyu Moon, Surhud More, Marco Muñoz-GutiérrezKeiji Ohtsuki, Rosemary E. Pike, Tsuyoshi Terai, Seitaro Urakawa, Fumi Yoshida, Hui Zhang, Haibin Zhao, Ji Lin Zhou

Graduate Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

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Abstract

Using the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1 km < D < 3 km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3 hr. Assuming rubble-pile structures for the Hildas, a bulk density of 1/41.5 g cm-3 is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33 g cm-3) and higher than the 1/41 g cm-3 bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3 hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633 hr and an estimated diameter of 0.7 km. This object is unlikely to be explained by a rubble-pile or monolithic structure.

Original language	English
Article number	7
Journal	Astrophysical Journal, Supplement Series
Volume	259
Issue number	1
DOIs	https://doi.org/10.3847/1538-4365/ac50ac
State	Published - 1 Mar 2022

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FOSSIL. II. Subaru/HSC light curves of Hildas
Chang, C.-K. (Creator), Chen, Y.-T. (Creator), Fraser, W. C. (Creator), Lehner, M. J. (Creator), Wang, S.-Y. (Creator), Alexandersen, M. (Creator), Choi, Y.-J. (Creator), Granados Contreras, A. P. (Creator), Ito, T. (Creator), Jeongahn, Y. (Contributor), Ji, J. (Creator), Kavelaars, J. J. (Creator), Kim, M.-J. (Creator), Lawler, S. M. (Creator), Li, J. (Creator), Lin, Z.-Y. (Creator), Lykawka, P. S. (Creator), Moon, H.-K. (Creator), More, S. (Creator), Muñoz-Gutiérrez, M. (Contributor), Ohtsuki, K. (Creator), Pike, R. E. (Creator), Terai, T. (Creator), Urakawa, S. (Creator), Yoshida, F. (Creator), Zhang, H. (Creator), Zhao, H. (Creator) & Zhou, J.-L. (Creator), Centre de Donnees Strasbourg (CDS), 2022
DOI: 10.26093/cds/vizier.22590007, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/259/7
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Chang, C. K., Chen, Y. T., Fraser, W. C., Lehner, M. J., Wang, S. Y., Alexandersen, M., Choi, Y. J., Granados Contreras, A. P., Ito, T., Jeongahn, Y., Ji, J., Kavelaars, J. J., Kim, M. J., Lawler, S. M., Li, J., Lin, Z. Y., Lykawka, P. S., Moon, H. K., More, S., ... Zhou, J. L. (2022). FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids. Astrophysical Journal, Supplement Series, 259(1), Article 7. https://doi.org/10.3847/1538-4365/ac50ac

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title = "FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids",

abstract = "Using the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1 km < D < 3 km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3 hr. Assuming rubble-pile structures for the Hildas, a bulk density of 1/41.5 g cm-3 is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33 g cm-3) and higher than the 1/41 g cm-3 bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3 hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633 hr and an estimated diameter of 0.7 km. This object is unlikely to be explained by a rubble-pile or monolithic structure.",

author = "Chang, {Chan Kao} and Chen, {Ying Tung} and Fraser, {Wesley C.} and Lehner, {Matthew J.} and Wang, {Shiang Yu} and Mike Alexandersen and Choi, {Young Jun} and {Granados Contreras}, {A. Paula} and Takashi Ito and Youngmin Jeongahn and Jianghui Ji and Kavelaars, {J. J.} and Kim, {Myung Jin} and Lawler, {Samantha M.} and Jian Li and Lin, {Zhong Yi} and Lykawka, {Patryk Sofia} and Moon, {Hong Kyu} and Surhud More and Marco Mu{\~n}oz-Guti{\'e}rrez and Keiji Ohtsuki and Pike, {Rosemary E.} and Tsuyoshi Terai and Seitaro Urakawa and Fumi Yoshida and Hui Zhang and Haibin Zhao and Zhou, {Ji Lin}",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

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Chang, CK, Chen, YT, Fraser, WC, Lehner, MJ, Wang, SY, Alexandersen, M, Choi, YJ, Granados Contreras, AP, Ito, T, Jeongahn, Y, Ji, J, Kavelaars, JJ, Kim, MJ, Lawler, SM, Li, J, Lin, ZY, Lykawka, PS, Moon, HK, More, S, Muñoz-Gutiérrez, M, Ohtsuki, K, Pike, RE, Terai, T, Urakawa, S, Yoshida, F, Zhang, H, Zhao, H & Zhou, JL 2022, 'FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids', Astrophysical Journal, Supplement Series, vol. 259, no. 1, 7. https://doi.org/10.3847/1538-4365/ac50ac

TY - JOUR

T1 - FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids

AU - Chang, Chan Kao

AU - Chen, Ying Tung

AU - Fraser, Wesley C.

AU - Lehner, Matthew J.

AU - Wang, Shiang Yu

AU - Alexandersen, Mike

AU - Choi, Young Jun

AU - Granados Contreras, A. Paula

AU - Ito, Takashi

AU - Jeongahn, Youngmin

AU - Ji, Jianghui

AU - Kavelaars, J. J.

AU - Kim, Myung Jin

AU - Lawler, Samantha M.

AU - Li, Jian

AU - Lin, Zhong Yi

AU - Lykawka, Patryk Sofia

AU - Moon, Hong Kyu

AU - More, Surhud

AU - Muñoz-Gutiérrez, Marco

AU - Ohtsuki, Keiji

AU - Pike, Rosemary E.

AU - Terai, Tsuyoshi

AU - Urakawa, Seitaro

AU - Yoshida, Fumi

AU - Zhang, Hui

AU - Zhao, Haibin

AU - Zhou, Ji Lin

PY - 2022/3/1

Y1 - 2022/3/1

N2 - Using the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1 km < D < 3 km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3 hr. Assuming rubble-pile structures for the Hildas, a bulk density of 1/41.5 g cm-3 is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33 g cm-3) and higher than the 1/41 g cm-3 bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3 hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633 hr and an estimated diameter of 0.7 km. This object is unlikely to be explained by a rubble-pile or monolithic structure.

AB - Using the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1 km < D < 3 km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3 hr. Assuming rubble-pile structures for the Hildas, a bulk density of 1/41.5 g cm-3 is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33 g cm-3) and higher than the 1/41 g cm-3 bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3 hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633 hr and an estimated diameter of 0.7 km. This object is unlikely to be explained by a rubble-pile or monolithic structure.

UR - http://www.scopus.com/inward/record.url?scp=85126625567&partnerID=8YFLogxK

U2 - 10.3847/1538-4365/ac50ac

DO - 10.3847/1538-4365/ac50ac

M3 - 期刊論文

AN - SCOPUS:85126625567

SN - 0067-0049

VL - 259

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

M1 - 7

ER -

FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids

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FOSSIL. II. Subaru/HSC light curves of Hildas

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