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Journal Articles Monthly Notices of the Royal Astronomical Society: Letters Year : 2023

Images of Betelgeuse with VLTI/MATISSE across the Great Dimming

Julien Drevon
Florentin Millour
Pierre Cruzalèbes
Alexis Matter
  • Function : Author
  • PersonId : 875057
Andrea Chiavassa
E. Cannon
Anthony Meilland
R. G. Petrov
Sylvie Robbe-Dubois
  • Function : Author
  • PersonId : 836724
P. Ábrahám
Thomas Henning
J. Isbell
Lucas Labadie
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  • PersonId : 1152480
G. Weigelt
Julien Woillez
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  • PersonId : 961616
A. de Koter
Violeta Gámez Rosas
Michiel Hogerheijde
James Leftley
Ph. Stee

Abstract

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.
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Dates and versions

hal-04237661 , version 1 (11-10-2023)

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Julien Drevon, Florentin Millour, Pierre Cruzalèbes, Claudia Paladini, Peter Scicluna, et al.. Images of Betelgeuse with VLTI/MATISSE across the Great Dimming. Monthly Notices of the Royal Astronomical Society: Letters, 2023, ⟨10.1093/mnrasl/slad138⟩. ⟨hal-04237661⟩
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