eRASSU J060839.5–704014: A double degenerate ultra-compact binary in the direction of the LMC

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Table 4.

Properties of DD ultra-compact binaries.

Source	Orbital period	kT	L_X	log(f_X/f_opt)	g′−r′	References
	[min]	[eV]	[erg s⁻¹]
HM Cnc	5.4	65	^(a)4.5 × 10³⁴	^(e)2.3 (2.4)	−0.44	1, 2, 7
V407 Vul	9.5	43	^(b)5 × 10³⁵–4 × 10³⁶	^(e)1.6 (3.5)	0.99	3, 4, 7, 8
3XMM J051034.6−682640	23.6	69	^(a)5 × 10³²	^(e)1.1 (1.2)	−0.03	5, 6
eRASSU J060839.5−704014	6.2	^(d)110	^(c)6 × 10³¹–1.5 × 10³³	^(e)1.6 (1.9)	0.25	This work

Notes.

^(a)

for d = 5 kpc;

^(b)

for d = 4 − 5 kpc, Gaia geometric distance 4.8 kpc (Bailer-Jones et al. 2021);

^(c)

for d = 1 − 5 kpc;

^(d)

also a hard bremmstahlung component detected;

^(e)

computed with the information of the mean g′ magnitude and maximum observed F_X (un-absorbed and reddening-corrected). The g′−r′ colours were obtained after reddening correction. The luminosities were corrected for absorption.

References. (1) Israel et al. (2003); (2) Schlegel (2005); (3) Haberl & Motch (1995); (4) Cropper et al. (1998); (5) Ramsay et al. (2018); (6) Haberl et al. (2017); (7) Barros et al. (2007); (8) Ramsay (2008).

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