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Constraints on the structure and seasonal variations of Triton's atmosphere from the 5 October 2017 stellar occultation and previous observations

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  • معلومة اضافية
    • Contributors:
      Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA); Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University (UNESP); Instituto de Astrofísica de Andalucía (IAA); Consejo Superior de Investigaciones Cientificas España = Spanish National Research Council Spain (CSIC); Johns Hopkins University (JHU); Laboratoire de Météorologie Dynamique (UMR 8539) (LMD); Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-École nationale des ponts et chaussées (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS-PSL; École normale supérieure - Paris (ENS-PSL); Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL); Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL); Institut Polytechnique des Sciences Avancées (IPSA); Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE); Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS); Observatoire de la Côte d'Azur (OCA); Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS); Comisión Nacional de Investigación y Desarrollo Aeroespacial (CONIDA); Observatorio Astronómico de Moquegua; Florida Space Institute Orlando (FSI); University of Central Florida Orlando (UCF); Universidade Tecnológica Federal do Paraná = Federal Technological University of Paraná Curitiba, Brésil (UTFPR); Observatório Nacional Rio de Janeiro (ON); Ministério da Ciência, Tecnologia, Inovações e Comunicações (MCTIC); Universidade Federal do Rio de Janeiro Brasil = Federal University of Rio de Janeiro Brazil = Université fédérale de Rio de Janeiro Brésil (UFRJ); Polo Educacional Sesc Rio de Janeiro; Université de Lille; Universidad del País Vasco Espainia / Euskal Herriko Unibertsitatea España = University of the Basque Country Spain = Université du pays basque Espagne (UPV / EHU); International Occultation Timing Association (IOTA); Internationale Amateursternwarte Mittenwalde (IAS); Société Astronomique de France (SAF); Institut de recherche en astrophysique et planétologie (IRAP); Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP); Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS); Institut Universitaire de Technologie - Paul Sabatier (IUT Paul Sabatier); Université de Toulouse (UT)-Université de Toulouse (UT); Géosciences Paris Saclay (GEOPS); Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS); Université Paris-Sud - Paris 11 (UP11); Analyse, ingénierie et contrôle des micro-organismes (MICROCOSME); Centre Inria de l'Université Grenoble Alpes; Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Université Grenoble Alpes (UGA); Laboratoire Ondes et Matière d'Aquitaine (LOMA); Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS); Laboratoire d'Astrophysique de Marseille (LAM); Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS); European Project: 669416,H2020,ERC-2014-ADG,LUCKY STAR(2015); European Project: 687378,H2020,H2020-COMPET-2015,SBNAF(2016)
    • بيانات النشر:
      CCSD
      EDP Sciences
    • الموضوع:
      2022
    • Collection:
      HAL Université Côte d'Azur
    • نبذة مختصرة :
      International audience ; Context. A stellar occultation by Neptune's main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection. Aims: We aimed at constraining Triton's atmospheric structure and the seasonal variations of its atmospheric pressure since the Voyager 2 epoch (1989). We also derived the shape of the lower atmosphere from central flash analysis. Methods: We used Abel inversions and direct ray-tracing code to provide the density, pressure, and temperature profiles in the altitude range ~8 km to ~190 km, corresponding to pressure levels from 9 µbar down to a few nanobars. Results: (i) A pressure of 1.18 ± 0.03 µbar is found at a reference radius of 1400 km (47 km altitude). (ii) A new analysis of the Voyager 2 radio science occultation shows that this is consistent with an extrapolation of pressure down to the surface pressure obtained in 1989. (iii) A survey of occultations obtained between 1989 and 2017 suggests that an enhancement in surface pressure as reported during the 1990s might be real, but debatable, due to very few high S/N light curves and data accessible for reanalysis. The volatile transport model analysed supports a moderate increase in surface pressure, with a maximum value around 2005-2015 no higher than 23 µbar. The pressures observed in 1995-1997 and 2017 appear mutually inconsistent with the volatile transport model presented here. (iv) The central flash structure does not show evidence of an atmospheric distortion. We find an upper limit of 0.0011 for the apparent oblateness of the atmosphere near the 8 km altitude. Light curves are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/659/A136
    • Relation:
      info:eu-repo/semantics/altIdentifier/arxiv/2201.10450; info:eu-repo/grantAgreement//669416/EU/Exploring the outer solar system beyond Neptune using stellar occultations/LUCKY STAR; info:eu-repo/grantAgreement//687378/EU/Small Bodies: Near and Far/SBNAF; ARXIV: 2201.10450; BIBCODE: 2022A&A.659A.136M
    • الرقم المعرف:
      10.1051/0004-6361/202141443
    • الدخول الالكتروني :
      https://insu.hal.science/insu-03656916
      https://insu.hal.science/insu-03656916v1/document
      https://insu.hal.science/insu-03656916v1/file/aa41443-21.pdf
      https://doi.org/10.1051/0004-6361/202141443
    • Rights:
      http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.1C033E64