@booklet {41821,
	title = {eRASSUJ060839.5-704014: A double degenerate ultra-compact binary in the direction of the LMC},
	year = {2024},
	month = {2024/01/1},
	pages = {arXiv:2401.17293},
	abstract = {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.},
	keywords = {Astrophysics - High Energy Astrophysical Phenomena},
	url = {https://ui.adsabs.harvard.edu/abs/2024arXiv240117293M},
	author = {Maitra, C. and Haberl, F. and Vasilopoulos, G. and Rau, A. and Schwope, A. and Friedrich, S. and Buckley, D. A. H. and Valdes, F. and Lang, D. and Macfarlane, S. A.}
}
