Article (Scientific journals)
Search for water outgassing of (1) Ceres near perihelion
Rousselot, P.; Opitom, C.; Jehin, Emmanuel et al.
2019In Astronomy and Astrophysics, 628, p. 22, pp. 1-6
Peer Reviewed verified by ORBi
 

Files


Full Text
2019A&A...628A..22R.pdf
Publisher postprint (1.09 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
minor planets; asteroids: individual: (1) Ceres
Abstract :
[en] Context. (1) Ceres is the largest body in the main asteroid belt and one of the most intriguing objects in the solar system, in part because of the discovery of water outgassing by the Herschel Space Observatory (HSO) and its still-debated origin. Ceres was the target of NASA's Dawn spacecraft for 3.5 yr, which achieved a detailed characterization of the dwarf planet. The possible influence of the local flux of solar energetic particles (SEP) on the production of a Cerean exosphere and water vapor has been suggested, in addition to the sublimation of water ice that depends on the temperature, meaning the heliocentric distance. <BR /> Aims: We used the opportunity of both the perihelion passage of (1) Ceres in April 2018, and the presence of Dawn in its vicinity (for measuring the SEP flux in real time) to check the influence of heliocentric distance and SEP flux on water outgassing. <BR /> Methods: We searched for OH emission lines near the limb of Ceres in the near-UV with the UVES spectrograph mounted on the 8-m ESO Very Large Telescope. Two spectra were recorded when Ceres was close to its perihelion, in February 2018, and with Dawn spacecraft orbiting Ceres. It was possible to simultaneously measure energetic particles around Ceres at the time of our observations. <BR /> Results: Our observations did not permit detection of OH emission lines to a very high sensitivity level. This level is estimated to correspond to a global water production rate of Q[SUB]H[SUB]2[/SUB]O[/SUB] ∽ 2 × 10[SUP]26[/SUP] molecules s[SUP]-1[/SUP], similar to the water production rate derived from HSO observations. The solar energetic particles flux measured around Ceres was negligible at the time of these observations. <BR /> Conclusions: Our observations support the idea that heliocentric distance (i.e., the sublimation of water ice) does not play a major role in the water emission from Ceres. This production rate could be either related to SEP events or to other mechanisms, possibly of endogenic origin. Based on observations collected at the European Southern Observatory under ESO program 2100.C-5038(A).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rousselot, P.;  Institut UTINAM UMR 6213, CNRS, Université Bourgogne Franche-Comté, OSU THETA, BP 1615, 25010, Besançon Cedex, France
Opitom, C.;  European Southern Observatory, Alonso de Còrdova 3107, Vitacura Casilla, 19001, Santiago, Chile
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Villarreal, M. N.;  Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA
Li, J.-Y.;  Planetary Science Institute, 1700 E Fort Lowell Road, Tucson, AZ, 85719, USA
Castillo-Rogez, J.;  Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA
Russell, C. T.;  Earth, Planetary and Space Sciences, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA, 90095-1567, USA
Vernazza, Pierre;  Aix-Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, Marseille, France
Marsset, M.;  Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
Roth, L.;  School of Electrical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
Dumas, C.;  Thirty-Meter-Telescope, 100 West Walnut St, Suite 300, Pasadena, CA, 91124, USA
Yang, B.;  European Southern Observatory, Alonso de Còrdova 3107, Vitacura Casilla, 19001, Santiago, Chile ; Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, PR China
Prettyman, T. H.;  Planetary Science Institute, 1700 E Fort Lowell Road, Tucson, AZ, 85719, USA
Mousis, O.;  Aix-Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, Marseille, France)
More authors (6 more) Less
Language :
English
Title :
Search for water outgassing of (1) Ceres near perihelion
Publication date :
01 August 2019
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
628
Pages :
A22, pp. 1-6
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 August 2019

Statistics


Number of views
64 (4 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
10
Scopus citations®
without self-citations
4
OpenCitations
 
7

Bibliography


Similar publications



Contact ORBi