A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea

Vernazza, Pierre; Jordá, L.; Ševeček, Pavel; Brož, M.; Viikinkoski, Matti; Hanuš, Josef; Carry, B.; Drouard, A.; Ferrais, Marin; Marsset, M.; Marchis, Franck; Birlan, Mirel; Podlewska-Gaca, E.; Jehin, Emmanuël; Bartczak, P.; Dudziński, G.; Berthier, J.; Castillo‐Rogez, Julie; Cipriani, F.; Colas, F.; DeMeo, Francesca E.; Dumas, Christophe; Ďurech, Josef; Fétick, Romain; Fusco, Thierry; Grice, J.; Kaasalainen, M.; Kryszczyńska, A.; Lamy, P.; Coroller, H. Le; Marciniak, A.; Michałowski, Tadeusz; Michel, P.; Rambaux, N.; Santana-Ros, T.; Tanga, P.; Vachier, F.; Vigan, A.; Witasse, Olivier; Yang, Bin; Gillon, M.; Benkhaldoun, Z.; Szakáts, R.; Hirsch, R.; Duffárd, R.; Chapman, Allan; Maestre, J. L.

doi:10.1038/s41550-019-0915-8

Cited by 47 publications

(25 citation statements)

References 40 publications

(48 reference statements)

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“…Hygiea has been thought to have experienced a disruptive impact (Vernazza et al., 2020), but it shows an absorption feature consistent with ammoniated phyllosilicates. A possible explanation is incomplete loss of mantle materials upon the impact.…”

Section: Discussionmentioning

confidence: 99%

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Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies

et al. 2022

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Volatile compositions of asteroids provide information on the Solar System history and the origins of Earth's volatiles. Visible to near‐infrared observations at wavelengths of <2.5 µm have suggested a genetic link between outer main belt asteroids located at 2.5–4 au and carbonaceous chondrite meteorites (CCs) that show isotopic similarities to volatile elements on Earth. However, recent longer wavelength data for large outer main belt asteroids show 3.1 μm absorption features of ammoniated phyllosilicates that are absent in CCs and cannot easily form from materials stable at those present distances. Here, by combining data collected by the AKARI space telescope and hydrological, geochemical, and spectral models of water‐rock reactions, we show that the surface materials of asteroids having 3.1 μm absorption features and CCs can originate from different regions of a single, water‐rock‐differentiated parent body. Ammoniated phyllosilicates form within the water‐rich mantles of the differentiated bodies containing NH3 and CO2 under high water‐rock ratios (>4) and low temperatures (<70°C). CCs can originate from the rock‐dominated cores, that are likely to be preferentially sampled as meteorites by disruption and transport processes. Our results suggest that multiple large main belt asteroids formed beyond the NH3 and CO2 snow lines (currently >10 au) and could be transported to their current locations. Earth's high hydrogen to carbon ratio may be explained by accretion of these water‐rich progenitors.

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Section: Discussionmentioning

confidence: 99%

“…This would also be applicable to Hygiea. Unless the impact completely removed the water‐rich mantle, reaccumulation of fragments (Vernazza et al., 2020) and reformation of insulting lag deposit following sublimation of exposed water ice (Schorghofer, 2008) would keep the mantle materials.…”

Section: Discussionmentioning

confidence: 99%

Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies

et al. 2022

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“…• Extreme adaptive optics. Facilities such as VLT/SPHERE have produced striking maps of objects such as 10 Hygeia (Vernazza et al, 2020), but spatial resolutions limits this technique to the largest asteroids, due to the maximum available 8-10 meter aperture sizes. • Ground-based occultations.…”

Section: Competing Approachesmentioning

confidence: 99%

LightBeam: Flyby-Like Imaging Without The Flyby

Belle

Kugler

Moskovitz

et al. 2021

Bulletin of the AAS

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“…This suggests Ceres is more akin to other icy moons and dwarf planets of the outer solar system. Ceres is likely not unique in the main belt: at least one body, 10 Hygiea, and shares similar spectral properties (e.g., Vernazza et al, 2017;Rivkin et al, 2019) and density (*2000 g/cm 3 ) (Vernazza et al, 2019).…”

Section: Pre-dawn Assessment Of Ceres' Geophysical Statementioning

confidence: 99%

Ceres: Astrobiological Target and Possible Ocean World

et al. 2020

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Ceres, the most water-rich body in the inner solar system after Earth, has recently been recognized to have astrobiological importance. Chemical and physical measurements obtained by the Dawn mission enabled the quantification of key parameters, which helped to constrain the habitability of the inner solar system's only dwarf planet. The surface chemistry and internal structure of Ceres testify to a protracted history of reactions between liquid water, rock, and likely organic compounds. We review the clues on chemical composition, temperature, and prospects for long-term occurrence of liquid and chemical gradients. Comparisons with giant planet satellites indicate similarities both from a chemical evolution standpoint and in the physical mechanisms driving Ceres' internal evolution.

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A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea

Cited by 47 publications

References 40 publications

Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies

Distant Formation and Differentiation of Outer Main Belt Asteroids and Carbonaceous Chondrite Parent Bodies

LightBeam: Flyby-Like Imaging Without The Flyby

Ceres: Astrobiological Target and Possible Ocean World

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