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Article Dans Une Revue Astron.Astrophys. Année : 2024

eRASSUJ060839.5-704014: A double degenerate ultra-compact binary in the direction of the LMC

C Maitra
  • Fonction : Auteur
F Haberl
  • Fonction : Auteur
A Rau
  • Fonction : Auteur
A Schwope
  • Fonction : Auteur
S Friedrich
  • Fonction : Auteur
D.A.H Buckley
  • Fonction : Auteur
F Valdes
  • Fonction : Auteur
D Lang
  • Fonction : Auteur
S.A Macfarlane
  • Fonction : Auteur

Résumé

Context. During four all-sky surveys (eRASS1--4), eROSITA, the soft X-ray instrument aboard Spektrum-Roentgen-Gamma (SRG) detected a new supersoft X-ray source, eRASSU J060839.5-704014, in the direction of the Large Magellanic Cloud (LMC). Methods. We arranged follow-up observations in the X-ray and optical wavelengths and further searched in archival observations to reveal the nature of the object. Results. We discover pulsations at ~374 s with a pulse profile consistent with 100% modulation. We identify two other periodicities in the eROSITA data, which we establish as aliases due to the sampling of the eROSITA light curve. We identify a multi-wavelength counterpart to the X-ray source in UVW1 and g, r, i, and z images obtained by the optical/UV monitor on XMM-Newton and the Dark Energy Camera at the Cerro Tololo Inter-American Observatory. The timing and spectral characteristics of the source are consistent with a double degenerate ultra-compact binary system in the foreground of the LMC. eRASSU J060839.5-704014 belongs to a rare class of AM CVns, which are important to study in the context of progenitors of SN Ia and for persistent gravitational wave detection. Conclusions. We identify eRASSU J060839.5-704014 as a new double degenerate ultra-compact binary located in the foreground of the LMC.

Dates et versions

hal-04455650 , version 1 (13-02-2024)

Identifiants

Citer

C Maitra, F Haberl, G Vasilopoulos, A Rau, A Schwope, et al.. eRASSUJ060839.5-704014: A double degenerate ultra-compact binary in the direction of the LMC. Astron.Astrophys., 2024, 683, pp.A21. ⟨10.1051/0004-6361/202347811⟩. ⟨hal-04455650⟩
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