The Short Rotation Period of Hi'iaka, Haumea's Largest Satellite
| Autor: | Luke Burkhart, Cesar I. Fuentes, Danielle M. Hastings, Jean-Luc Margot, Michael E. Brown, Matthew J. Holman, Daniel C. Fabrycky, Darin Ragozzine |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Rotation period
Physics Earth and Planetary Astrophysics (astro-ph.EP) dynamical evolution and stability [planets and satellites] 010504 meteorology & atmospheric sciences Phase dispersion minimization Dwarf planet Haumea Astronomy FOS: Physical sciences Astronomy and Astrophysics Orbital period Light curve 01 natural sciences Tidal locking photometric [techniques] individual (Hi'iaka) [planets and satellites] Space and Planetary Science 0103 physical sciences Roche limit Astrophysics::Earth and Planetary Astrophysics individual (Haumea) [Kuiper belt objects] 010303 astronomy & astrophysics 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Hastings, DM; Ragozzine, D; Fabrycky, DC; Burkhart, LD; Fuentes, C; Margot, J-L; et al.(2016). THE SHORT ROTATION PERIOD OF HI'IAKA, HAUMEA'S LARGEST SATELLITE. ASTRONOMICAL JOURNAL, 152(6). doi: 10.3847/0004-6256/152/6/195. UCLA: Retrieved from: http://www.escholarship.org/uc/item/7q75z7fq |
| DOI: | 10.3847/0004-6256/152/6/195. |
| Popis: | Hi'iaka is the larger outer satellite of the dwarf planet Haumea. Using relative photometry from the Hubble Space Telescope and Magellan and a phase dispersion minimization analysis, we have identified the rotation period of Hi'iaka to be ~9.8 hrs (double-peaked). This is ~120 times faster than its orbital period, creating new questions about the formation of this system and possible tidal evolution. The rapid rotation suggests that Hi'iaka could have a significant obliquity and spin precession that could be visible in light curves within a few years. We then turn to an investigation of what we learn about the (presently unclear) formation of the Haumea system and family based on this unexpectedly rapid rotation rate. We explore the importance of the initial semi-major axis and rotation period in tidal evolution theory and find they strongly influence the time required to despin to synchronous rotation, relevant to understanding a wide variety of satellite and binary systems. We find that despinning tides do not necessarily lead to synchronous spin periods for Hi'iaka, even if it formed near the Roche limit. Therefore the short rotation period of Hi'iaka does not rule out significant tidal evolution. Hi'iaka's spin period is also consistent with formation near its current location and spin up due to Haumea-centric impactors. 21 pages with 6 figures, to be published in The Astronomical Journal |
| Databáze: | OpenAIRE |
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