A remarkable recurrent nova in M 31: The 2010 eruption recovered and evidence of a six-month period

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Table 1

List of observed eruptions of M31N 2008-12a.

t_{max, optical}^a	t_{max, X−ray}^b	Days since	Source	References
(UT)	(UT)	last eruption^c

(1992 Jan. 29)	1992 Feb. 05		X-ray (ROSAT)	1
(1993 Jan. 04)	1993 Jan. 11	341	X-ray (ROSAT)	1
(2001 Aug. 26)	2001 Sep. 08		X-ray (Chandra)	2
2008 Dec. 26			Optical	3
2009 Dec. 03		342	Optical (Palomar Transient Factory)	4
2010 Nov. 20		353	Optical	5
2011 Oct. 23.49		337.5	Optical	4, 6, 7, 8
2012 Oct. 19.72	<2012 Nov. 06.45	362.2	Optical; X-ray (Swift)	8, 9, 10, 11
2013 Nov. 28.60	2013 Dec. 05.9 ± 0.2	405.1	Optical (iPTF); X-ray (Swift)	4, 8, 11, 12, 13
2014 Oct. 03.7 ± 0.1	2014 Oct. 13.6	309.1	Optical (Liverpool Telescope); X-ray (Swift)	8, 14

Notes. Updated version of Table 1 from Tang et al. (2014).

^(a)

Time of the optical peak, those in parentheses are extrapolated from the X-ray data (see Sect. 3.2).

^(b)

Time of the X-ray peak.

^(c)

Time since last eruption only quoted when consecutive detections occurred in consecutive years.

Reference. (1) White et al. (1995); (2) Williams et al. (2004); (3) Nishiyama & Kabashima (2008); (4) Tang et al. (2014); (5) this Letter; (6) Korotkiy & Elenin (2011); (7) Barsukova et al. (2011); (8) Darnley et al. (2015a); (9) Nishiyama & Kabashima (2012); (10) Shafter et al. (2012); (11) Henze et al. (2014); (12) Tang et al. (2013); (13) Darnley et al. (2014); (14) Henze et al. (2015).

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