Ammoniated phyllosilicates with a likely outer Solar System origin on (1) Ceres
M. C. De Sanctis,E. Ammannito,E. Ammannito,Andrea Raponi,Simone Marchi,Simone Marchi,T. B. McCord,Harry Y. McSween,Fabrizio Capaccioni,Maria Teresa Capria,Filippo Giacomo Carrozzo,Mauro Ciarniello,Andrea Longobardo,Federico Tosi,Sergio Fonte,Michelangelo Formisano,Alessandro Frigeri,Marco Giardino,Gianfranco Magni,Ernesto Palomba,Diego Turrini,Francesca Zambon,J. P. Combe,William C. Feldman,Ralf Jaumann,Lucy A. McFadden,Carle M. Pieters,Thomas H. Prettyman,Michael J. Toplis,Carol A. Raymond,Christopher T. Russell +30 more
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Measurements of Ceres indicate widespread ammoniated phyllosilicates across the surface, but no detectable water ice, which suggests that material from the outer Solar System was incorporated into Ceres, either during its formation at great heliocentric distance or by incorporation of material transported into the main asteroid belt.Abstract:
Studies of the dwarf planet (1) Ceres using ground-based and orbiting telescopes have concluded that its closest meteoritic analogues are the volatile-rich CI and CM carbonaceous chondrites. Water in clay minerals, ammoniated phyllosilicates, or a mixture of Mg(OH)2 (brucite), Mg2CO3 and iron-rich serpentine have all been proposed to exist on the surface. In particular, brucite has been suggested from analysis of the mid-infrared spectrum of Ceres. But the lack of spectral data across telluric absorption bands in the wavelength region 2.5 to 2.9 micrometres--where the OH stretching vibration and the H2O bending overtone are found--has precluded definitive identifications. In addition, water vapour around Ceres has recently been reported, possibly originating from localized sources. Here we report spectra of Ceres from 0.4 to 5 micrometres acquired at distances from ~82,000 to 4,300 kilometres from the surface. Our measurements indicate widespread ammoniated phyllosilicates across the surface, but no detectable water ice. Ammonia, accreted either as organic matter or as ice, may have reacted with phyllosilicates on Ceres during differentiation. This suggests that material from the outer Solar System was incorporated into Ceres, either during its formation at great heliocentric distance or by incorporation of material transported into the main asteroid belt.read more
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Journal ArticleDOI
Space weathering on airless bodies
Carle M. Pieters,Sarah K. Noble +1 more
TL;DR: Volatile-rich bodies and those composed of abundant hydrous minerals (dwarf planet Ceres, many dark asteroids, outer solar system satellites) are affected by space weathering processes differently than the silicate bodies of the inner solar system.
Journal ArticleDOI
Bright carbonate deposits as evidence of aqueous alteration on (1) Ceres
M. C. De Sanctis,Andrea Raponi,Eleonora Ammannito,Eleonora Ammannito,Mauro Ciarniello,Michael J. Toplis,Harry Y. McSween,Julie Castillo-Rogez,Bethany L. Ehlmann,Filippo Giacomo Carrozzo,Simone Marchi,Simone Marchi,Federico Tosi,Francesca Zambon,Fabrizio Capaccioni,Maria Teresa Capria,Sergio Fonte,Michelangelo Formisano,Alessandro Frigeri,Marco Giardino,Andrea Longobardo,Gianfranco Magni,Ernesto Palomba,Lucy A. McFadden,Carle M. Pieters,Ralf Jaumann,Paul M. Schenk,Raffaele Mugnuolo,Carol A. Raymond,Christopher T. Russell +29 more
TL;DR: Spectra of these bright areas in the Occator crater on Ceres are consistent with a large amount of sodium carbonate, constituting the most concentrated known extraterrestrial occurrence of carbonate on kilometre-wide scales in the Solar System.
Journal ArticleDOI
The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy
Kohei Kitazato,Ralph E. Milliken,Takahiro Iwata,Takahiro Iwata,Masanao Abe,Masanao Abe,Makiko Ohtake,Makiko Ohtake,Shuji Matsuura,Takehiko Arai,Yusuke Nakauchi,Tomoki Nakamura,Moe Matsuoka,Hiroki Senshu,Naru Hirata,Takahiro Hiroi,C. Pilorget,Rosario Brunetto,François Poulet,Lucie Riu,J. P. Bibring,Driss Takir,Deborah L. Domingue,Faith Vilas,M. A. Barucci,Davide Perna,Ernesto Palomba,A. Galiano,Kohji Tsumura,Kohji Tsumura,Takahito Osawa,Mutsumi Komatsu,Aiko Nakato,N. Takato,Tsuneo Matsunaga,Y. Takagi,Koji Matsumoto,Toru Kouyama,Y. Yokota,Y. Yokota,Eri Tatsumi,Naoya Sakatani,Yukio Yamamoto,Yukio Yamamoto,Tatsuaki Okada,Tatsuaki Okada,S. Sugita,R. Honda,Tomokatsu Morota,Shingo Kameda,Hirotaka Sawada,C. Honda,Manabu Yamada,H. Suzuki,Kosuke Yoshioka,Masahiro Hayakawa,K. Ogawa,Yuichiro Cho,Kei Shirai,Yuri Shimaki,Akira Yamaguchi,Akira Yamaguchi,Naoko Ogawa,Fuyuto Terui,Tomohiro Yamaguchi,Yuto Takei,Takanao Saiki,Satoru Nakazawa,Satoshi Tanaka,Satoshi Tanaka,Makoto Yoshikawa,Makoto Yoshikawa,Sei-ichiro Watanabe,Sei-ichiro Watanabe,Yoshiyuki Tsuda,Yoshiyuki Tsuda +75 more
TL;DR: The Hayabusa2 team's study of the near-Earth carbonaceous asteroid 162173 Ryugu, at which the spacecraft arrived in June 2018, describes Ryugu's geological features and surface colors and combined results from all three papers to constrain the asteroid's formation process.
Journal ArticleDOI
Dawn Arrives at Ceres: Exploration of a Small Volatile-Rich World
Christopher T. Russell,Carol A. Raymond,Eleonora Ammannito,Debra Buczkowski,M. C. De Sanctis,Harald Hiesinger,Ralf Jaumann,Alex S. Konopliv,Harry Y. McSween,Andreas Nathues,Ryan S. Park,Carle M. Pieters,Thomas H. Prettyman,T. B. McCord,Lucy A. McFadden,Stefano Mottola,Maria T. Zuber,Steve Joy,Carol A. Polanskey,Marc D. Rayman,Julie Castillo-Rogez,Peter Chi,J. P. Combe,Anton I. Ermakov,Roger R. Fu,Michael J. Hoffmann,Y. D. Jia,Scott D. King,David J. Lawrence,Jian-Yang Li,Simone Marchi,Frank Preusker,T. Roatsch,Ottaviano Ruesch,Paul M. Schenk,Michaela Villarreal,Naoyuki Yamashita +36 more
TL;DR: C Ceres’ dry exterior displays hydroxylated silicates, including ammoniated clays of endogenous origin, which suggest a mechanically strong lithosphere with a weaker deep interior.
Journal ArticleDOI
Extensive water ice within Ceres’ aqueously altered regolith: Evidence from nuclear spectroscopy
Thomas H. Prettyman,Naoyuki Yamashita,Michael J. Toplis,Harry Y. McSween,Norbert Schorghofer,Simone Marchi,William C. Feldman,Julie Castillo-Rogez,Olivier Forni,David J. Lawrence,Eleonora Ammannito,Bethany L. Ehlmann,Hanna G. Sizemore,Steve Joy,Carol A. Polanskey,Marc D. Rayman,Carol A. Raymond,Christopher T. Russell +17 more
TL;DR: Nuclear spectroscopy data acquired by NASA’s Dawn mission determined the concentrations of elemental hydrogen, iron, and potassium on Ceres, and show that surface materials were processed by the action of water within the interior, confirming theoretical predictions that ice can survive for billions of years just beneath the surface.
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