Reconstructing the mid-infrared environment in the stellar merger remnant V838 Monocerotis - Archive ouverte HAL
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2024

Reconstructing the mid-infrared environment in the stellar merger remnant V838 Monocerotis

Muhammad Zain Mobeen
  • Fonction : Auteur
Tomasz Kamiński
  • Fonction : Auteur
Markus Wittkowski
  • Fonction : Auteur
John D Monnier
  • Fonction : Auteur
Stefan Kraus
  • Fonction : Auteur
Narsireddy Anugu
  • Fonction : Auteur
Theo Ten Brummelaar
  • Fonction : Auteur
Claire L Davies
  • Fonction : Auteur
Jacob Ennis
  • Fonction : Auteur
Tyler Gardner
  • Fonction : Auteur
Aaron Labdon
  • Fonction : Auteur
Cyprien Lanthermann
  • Fonction : Auteur
Gail H Schaefer
  • Fonction : Auteur
Benjamin R Setterholm
  • Fonction : Auteur
Nour Ibrahim
  • Fonction : Auteur
Steve B Howell
  • Fonction : Auteur

Résumé

V838 Mon is a stellar merger remnant that erupted in 2002 in a luminous red novae event. Although it is well studied in the optical, near infrared and submillimeter regimes, its structure in the mid-infrared wavelengths remains elusive. We observed V838 Mon with the MATISSE (LMN bands) and GRAVITY (K band) instruments at the VLTI and also the MIRCX/MYSTIC (HK bands) instruments at the CHARA array. We geometrically modelled the squared visibilities and the closure phases in each of the bands to obtain constraints on physical parameters. Furthermore, we constructed high resolution images of V838 Mon in the HK bands, using the MIRA and SQUEEZE algorithms to study the immediate surroundings of the star. Lastly, we also modelled the spectral features seen in the K and M bands at various temperatures. The image reconstructions show a bipolar structure that surrounds the central star in the post merger remnant. In the K band, the super resolved images show an extended structure (uniform disk diameter $\sim 1.94$ mas) with a clumpy morphology that is aligned along a north-west position angle (PA) of $-40^\circ$. Whereas in the H band, the extended structure (uniform disk diameter $\sim 1.18$ mas) lies roughly along the same PA. However, the northern lobe is slightly misaligned with respect to the southern lobe, which results in the closure phase deviations. The VLTI and CHARA imaging results show that V838 Mon is surrounded by features that resemble jets that are intrinsically asymmetric. This is also confirmed by the closure phase modelling. Further observations with VLTI can help to determine whether this structure shows any variation over time, and also if such bipolar structures are commonly formed in other stellar merger remnants.

Dates et versions

hal-04170696 , version 1 (25-07-2023)

Identifiants

Citer

Muhammad Zain Mobeen, Tomasz Kamiński, Alexis Matter, Markus Wittkowski, John D Monnier, et al.. Reconstructing the mid-infrared environment in the stellar merger remnant V838 Monocerotis. Astronomy and Astrophysics - A&A, 2024, 686, pp.A260. ⟨10.1051/0004-6361/202347322⟩. ⟨hal-04170696⟩
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