Imaging the spotty surface of Betelgeuse in the H band

  title={Imaging the spotty surface of Betelgeuse in the H band},
  author={X. Haubois and Guy Perrin and Sylvestre Lacour and Tijl Verhoelst and Serge Meimon and Laurent M. Mugnier and {\'E}ric Thi{\'e}baut and J. P. Berger and Stephen T. Ridgway and John D. Monnier and Rafael Millan-Gabet and Wesley A. Traub},
  journal={Astronomy and Astrophysics},
Aims. This paper reports on H-band interferometric observations of Betelgeuse made at the three-telescope interferometer IOTA. We image Betelgeuse and its asymmetries to understand the spatial variation of the photosphere, including its diameter, limb darkening, effective temperature, surrounding brightness, and bright (or dark) star spots. Methods. We used different theoretical simulations of the photosphere and dusty environment to model the visibility data. We made images with parametric… 
Convective cells in Betelgeuse: imaging through spectropolarimetry
Aims. We assess the ability to image the photosphere of red supergiants and, in particular Betelgeuse, through the modelling of the observed linear polarization in atomic spectral lines. We also aim
The inner dust shell of Betelgeuse detected by polarimetric aperture-masking interferometry
Context. Theory surrounding the origin of the dust-laden winds from evolved stars remains mired in controversy. Characterizing the formation loci and the dust distribution within approximately the
Interferometry to Image Surface Spots
I present in this lecture the technique of interferometric imaging at optical/infrared wavelengths. The technique has matured since the pioneering work of Michelson at the end of the XIXth—beginning
A low optical depth region in the inner disk of the HerbigAe star HR5999
Circumstellar disks surrounding young stars are known to be the birthplaces of planets, and the innermost astronomical unit is of particular interest. We present new long-baseline
The close circumstellar environment of Betelgeuse - III. SPHERE/ZIMPOL imaging polarimetry in the visible
Context. Mass-loss occurring in red supergiants (RSGs) is a major contributor to the enrichment of the interstellar medium in dust and molecules. The physical mechanism of this mass loss is however
Imaging the dynamical atmosphere of the red supergiant Betelgeuse in the CO first overtone lines with VLTI/AMBER ,
Aims. We present one-dimensional aperture synthesis imaging of the red supergiant Betelgeuse (α Ori) with VLTI/AMBER. We reconstructed for the first time one-dimensional images in the individual CO
Direct imaging with a hypertelescope of red supergiant stellar surfaces
High angular resolution images obtained with a hypertelescope can strongly constrain the radiative-hydrodynamics simulations of red supergiant (RSG) stars, in terms of intensity contrast, granulation
Atmosphere of Betelgeuse before and during the Great Dimming event revealed by tomography
Context. Despite being the best studied red supergiant star in our Galaxy, the physics behind the photometric variability and mass loss of Betelgeuse is poorly understood. Moreover, recently the star
We report on high-accuracy high-resolution (<20 mas) stellar observations obtained with the Palomar Fiber Nuller (PFN), a near-infrared (2.2 μm) interferometric coronagraph installed at the Palomar
Image reconstruction in optical interferometry: benchmarking the regularization
With the advent of infrared long-baseline interferometers with more than two telescopes, both the size and the completeness of interferometric data sets have significantly increased, allowing images


The limb-darkened Arcturus: imaging with the IOTA/IONIC interferometer
Aims. We undertook an H band interferometric examination of Arcturus, a star frequently used as a spatial and spectral calibrator. Methods. Using the IOTA 3 telescope interferometer, we performed
New views of Betelgeuse: multi‐wavelength surface imaging and implications for models of hotspot generation
ABSTRA C T We report contemporaneous multi-wavelength interferometric imaging of the red supergiant star Betelgeuse (a Orionis), using the Cambridge Optical Aperture Synthesis Telescope (COAST) and
Interferometric observations of the supergiant stars α Orionis and α Herculis with FLUOR at IOTA
We report the observations in the K band of the red supergiant star α Orionis and of the bright giant star α Herculis with the FLUOR beamcombiner at the IOTA interferometer. The high quality of the
The Close Circumstellar Environment of Betelgeuse: Adaptive Optics Spectro-imaging in the Near-IR with VLT/NACO
Context. Betelgeuse is one the largest stars in the sky in terms of angular diameter. Structures on the stellar photosphere have been detected in the visible and near-infrared as well as a compact
High-resolution imaging of Betelgeuse and Mira
Diffraction-limited images have been made of the M giant stars α Orionis (Betelgeuse) and ο Ceti (Mira), using the non-redundant masking method at the 4.2-m William Herschel Telescope, for
Spatially resolving the inhomogeneous structure of the dynamical atmosphere of Betelgeuse with VLTI/AMBER
Context. Aims. We present spatially resolved high-spectral resolution K-band observations of the red supergiant Betelgeuse (α Ori) using AMBER at the Very Large Telescope Interferometer (VLTI). Our
Spatially Resolved Hubble Space Telescope Spectra of the Chromosphere of α Orionis
Spatially resolved UV spectra of the supergiant α Orionis (Betelgeuse) obtained in 1995 March with the Goddard High Resolution Spectrograph (GHRS) on board the Hubble Space Telescope (HST) show that
First Results with the IOTA3 Imaging Interferometer: The Spectroscopic Binaries λ Virginis and WR 140
We report the first spatially resolved observations of the spectroscopic binaries λ Vir and WR 140, including the debut of aperture-synthesis imaging with the upgraded three-telescope IOTA
The molecular and dusty composition of Betelgeuse's inner circumstellar environment
Context. The study of the atmosphere of red supergiant stars in general and of Betelgeuse (α Orionis) in particular is of prime importance to understand dust formation and how mass is lost to the
Water Vapor on Betelgeuse as Revealed by TEXES
The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged.