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Comparison of a pebbles-based model with the observed evolution of the water and carbon dioxide outgassing of comet 67P/Churyumov-Gerasimenko

Ciarniello, Mauro and Fulle, M and Tosi, F and Mottola, Stefano and Capaccioni, F and Bockelee-Morvan, D. and Longobardo, A and Raponi, A and Filacchione, G and Rinaldi, G and Rotundi, A and De Sanctis, M C and Formisano, M and Magni, G (2023) Comparison of a pebbles-based model with the observed evolution of the water and carbon dioxide outgassing of comet 67P/Churyumov-Gerasimenko. Monthly Notices of the Royal Astronomical Society, 523 (4). Oxford University Press. doi: 10.1093/mnras/stad1663. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/523/4/5841/7198564

Abstract

The Rosetta mission escorted comet 67P/Churyumov-Gerasimenko for approximately two years including the perihelion passage (1.24 au, August 2015), allowing us to monitor the seasonal evolution of the water and carbon dioxide loss rates. Here, we model 67P/Churyumov-Gerasimenko water and carbon dioxide production as measured by the Rosina experiment during the entire escort phase by applying theWater-ice-Enriched Block (WEB) model, namely a structural and activity model for a nucleus made of pebbles. Furthermore, we compare the surface temperature distribution inferred by VIRTIS-M observations in August 2014 (≈3.5 au inbound, northern summer) with the expected temperatures from our simulations in the nucleus’ northern hemisphere, investigating the relevance of self-illumination effects in the comet "neck" and assessing the active area extent during the northern summer. Our simulations imply that: 1) water production at perihelion is mostly from the dehydration of water-poor pebbles, continuously exposed by CO2-driven erosion; 2) at large heliocentric distances outbound the water loss rate is dominated by the self-cleaning of fallout deposits; 3) the outbound steep decrease of the water production curve with heliocentric distance results from the progressive reduction of the nucleus water-active area, as predicted by the proposed model; 4) in August 2014 the water production is dominated by distributed sources, originating in the active "neck"; 5) distributed sources originating in water-ice-rich exposures dominate the water production approximately up to the inbound equinox; 6) the time evolution of the CO2 loss rate during the Rosetta escort phase is consistent with the WEB model.

Item URL in elib:https://elib.dlr.de/195705/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Comparison of a pebbles-based model with the observed evolution of the water and carbon dioxide outgassing of comet 67P/Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ciarniello, MauroUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fulle, MINAF Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34143 Trieste, ItalyUNSPECIFIEDUNSPECIFIED
Tosi, FIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, Italyhttps://orcid.org/0000-0003-4002-2434UNSPECIFIED
Mottola, StefanoUNSPECIFIEDhttps://orcid.org/0000-0002-0457-3872UNSPECIFIED
Capaccioni, FIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Bockelee-Morvan, D.LESIA Observatoire de Paris, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Longobardo, AIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Raponi, AIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, Italyhttps://orcid.org/0000-0003-4996-0099UNSPECIFIED
Filacchione, GIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, Italyhttps://orcid.org/0000-0001-9567-0055UNSPECIFIED
Rinaldi, GIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, Italyhttps://orcid.org/0000-0002-2968-0455UNSPECIFIED
Rotundi, AIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, ItalyUNSPECIFIEDUNSPECIFIED
De Sanctis, M CIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Formisano, MIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Magni, GIAPS-INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00133, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Date:15 June 2023
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:523
DOI:10.1093/mnras/stad1663
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:comets, 67P/Churyumov-Gerasimenko, analytical methods, numerical methods, space vehicles
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - CO-I Participations
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:28 Jun 2023 07:42
Last Modified:16 Dec 2024 12:35

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