The mid-infrared environment of the stellar merger remnant V838 Monocerotis

Abstract

In 2002, V838 Monocerotis (V838 Mon) erupted in a red novae event which has been interpreted to be a stellar merger. Soon after reaching peak luminosity, it began to cool, and its spectrum evolved to later spectral types. Dust was also formed in the post-merger remnant, making it bright in the mid-infrared. Interferometric studies at these wavelengths have suggested the presence of a flattened, elongated structure. We investigate, for the first time, the structure and orientation of the dusty envelope surrounding V838 Mon in the $L$(2.8-4.2 $\mu$m) band using recent observations with the MATISSE instrument at the VLTI. We perform simple geometrical modelling of the interferometric observables using basic models (disks, Gaussians, point sources, along with their combinations). We also reconstructed an image and analyzed the corresponding $L$-band spectrum. This study indicates the presence of an elongated, disk-like structure near 3.5$\mu$m, similar to what has been observed in other wavelength regimes. In particular, the orientation at a position angle of -40 degrees agrees with prior measurements in other bands. The dusty elongated structure surrounding V838 Mon appears to be a stable and long lived feature that has been present in the system for over a decade. Its substructure and origin remain unclear, but may be related to mass loss phenomena that took place in the orbital plane of the merged binary.

9 pages, 11 figures

References in corpus (12)

• The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• ExoMol molecular line lists V: The ro-vibrational spectra of NaCl and KCl
• V838 Monocerotis: A Geometric Distance from Hubble Space Telescope Polarimetric Imaging of its Light Echo
• Keck/HIRES spectroscopy of V838 Monocerotis in October 2005
• Pre-Common-Envelope Mass Loss from Coalescing Binary Systems
• Evolution of the stellar-merger red nova V1309 Scorpii: SED analysis
• ExoMol molecular line lists XXXVI: $X{}^2\Pi -X{}^2\Pi$ and $A{}^2{\Sigma }^{+}-X{}^2\Pi$ transitions of SH
• V838 Monocerotis: the central star and its environment a decade after outburst
• A self-calibration approach for optical long baseline interferometry imaging
• Molecular remnant of Nova 1670 (CK Vulpeculae): I. Properties and enigmatic origin of the gas
• High Spatial Resolution Mid-IR Imaging of V838 Monocerotis: Evidence of New Circumstellar Dust Creation
• The continued optical to mid-IR evolution of V838 Monocerotis

Cited by in corpus (3)

• Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631
• Reconstructing the mid-infrared environment in the stellar merger remnant V838 Monocerotis
• V838 Mon: A slow waking up of Sleeping Beauty?