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Images of Betelgeuse with VLTI/MATISSE across the Great Dimming

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  • معلومة اضافية
    • Contributors:
      Joseph Louis LAGRANGE (LAGRANGE); Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur; Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS); European Southern Observatory Santiago (ESO); European Southern Observatory (ESO); 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; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Institute of Astronomy Leuven; Catholic University of Leuven = Katholieke Universiteit Leuven (KU Leuven); Max-Planck-Institut für Radioastronomie (MPIFR); Konkoly Observatory; Research Centre for Astronomy and Earth Sciences Budapest; Hungarian Academy of Sciences (MTA)-Hungarian Academy of Sciences (MTA); Max Planck Institute for Astronomy (MPIA); Universität Wien = University of Vienna; Max-Planck-Institut für Astronomie (MPIA); Max-Planck-Gesellschaft; Leiden Observatory Leiden; Universiteit Leiden = Leiden University; I. Physikalisches Institut Köln; Universität zu Köln = University of Cologne; NASA Goddard Space Flight Center (GSFC); Astronomical Institute Anton Pannekoek (AI PANNEKOEK); University of Amsterdam Amsterdam = Universiteit van Amsterdam (UvA); Institute for Mathematics, Astrophysics and Particle Physics (IMAPP); Radboud University Nijmegen
    • بيانات النشر:
      HAL CCSD
      Oxford Journals
    • الموضوع:
      2023
    • Collection:
      HAL Université Côte d'Azur
    • نبذة مختصرة :
      International audience ; Abstract From Nov. 2019 to May 2020, the red supergiant star Betelgeuse experienced an unprecedented drop of brightness in the visible domain called the great dimming event. Large atmospheric dust clouds and large photospheric convective features are suspected to be responsible for it. To better understand the dimming event, we used mid-infrared long-baseline spectro-interferometric measurements of Betelgeuse taken with the VLTI/MATISSE instrument before (Dec. 2018), during (Feb. 2020), and after (Dec. 2020) the GDE. We present data in the 3.98 to 4.15 μm range to cover SiO spectral features molecules as well as adjacent continuum. We have employed geometrical models, image reconstruction, as well as radiative transfer models to monitor the spatial distribution of SiO over the stellar surface. We find a strongly in-homogeneous spatial distribution of SiO that appears to be looking very different between our observing epochs, indicative of a vigorous activity in the stellar atmosphere. The contrast of our images is small in the pseudo-continuum for all epochs, implying that our MATISSE observations support both cold spot and dust cloud model.
    • Relation:
      hal-04237661; https://hal.science/hal-04237661; https://hal.science/hal-04237661/document; https://hal.science/hal-04237661/file/slad138-1.pdf
    • الرقم المعرف:
      10.1093/mnrasl/slad138
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.7AFF52EF