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.

arXiv comment9 pages, 11 figures

References in corpus (30)

• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• ExoMol molecular line lists XXX: a complete high-accuracy line list for water
• V1309 Scorpii: merger of a contact binary
• The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• The mysterious eruption of V838 Mon
• Eruptions of the V838 Mon type: stellar merger versus nuclear outburst models
• ExoMol line lists II: The ro-vibrational spectrum of SiO
• ExoMol molecular line lists V: The ro-vibrational spectra of NaCl and KCl
• Cool and Luminous Transients from Mass-Losing Binary Stars
• Luminous Red Novae: Stellar Mergers or Giant Eruptions?
• Pre-explosion spiral mass loss of a binary star merger
• Evolution of V838 Monocerotis during and after the 2002 eruption
• V838 Monocerotis: A Geometric Distance from Hubble Space Telescope Polarimetric Imaging of its Light Echo
• Bound Outflows, Unbound Ejecta, and the Shaping of Bipolar Remnants during Stellar Coalescence
• Near infra-red spectroscopy of V838 Monocerotis
• Keck/HIRES spectroscopy of V838 Monocerotis in October 2005
• Pre-Common-Envelope Mass Loss from Coalescing Binary Systems
• V4332 Sagittarii: A circumstellar disc obscuring the main object
• ExoMol molecular line lists XXXVI: $X{}^2\Pi -X{}^2\Pi$ and $A{}^2{\Sigma }^{+}-X{}^2\Pi$ transitions of SH
• Evolution of the stellar-merger red nova V1309 Scorpii: SED analysis
• OIFITS 2: the 2nd version of the Data Exchange Standard for Optical (Visible/IR) Interferometry
• Spectroscopic and Spectropolarimetric Observations of V838 Mon
• 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
• An analysis of a spectrum of V838 Monocerotis in October 2005
• Interferometric Observations of V838 Monocerotis
• High Spatial Resolution Mid-IR Imaging of V838 Monocerotis: Evidence of New Circumstellar Dust Creation
• Evolution of the Inner Circumstellar Envelope of V838 Monocerotis
• The continued optical to mid-IR evolution of V838 Monocerotis

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