FU Ori-type outburst of 2MASS J06593158-0405277

ATel #6770; Hiroyuki Maehara (Okayama Astrophysical Observatory, NAOJ), Tadashi Kojima and Mitsugu Fujii (Fujii Kurosaki Observatory)
on 30 Nov 2014; 14:41 UT
Credential Certification: Hiroyuki Maehara (h.maehara@oao.nao.ac.jp)

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We report the discovery of an FU Ori-type outburst of 2MASS J06593158-0405277. The outburst was discovered by T. Kojima from the survey image obtained with a 85mm f/2.8 lens and Canon EOS 60D DSLR camera on 2014-11-03.821 UT at mag 11.0. The object was already visible on archival images taken on 2014-09-22.765 (mag 11.5) and 2014-10-06.792 (mag 11.2). However, nothing was visible at the position on archival images taken from 2012-10-25.767 to 2014-03-03.489 (limiting mag about 13). According to the photometric data from the Kamogata-Kiso-Kyoto Wide-field Survey (KWS; f.l.=105mm lens + SBIG ST-8XME CCD, 18"/pixel) database, the object was at Ic = 11.4 from 2013-10-12.809 to 2014-03-14.451 and it has brightened by 1.5 mag in Ic-band on 2014-10-06.826 (Ic = 9.9, V = 10.9). This object is identical to a YSO candidate AKARI J0659315-040533 (Toth et al. 2014).

A low-resolution spectrum (400-900 nm; R=600 at H-alpha) of the object was obtained with the 40-cm telescope at Fujii Kurosaki Observatory, Oakayama, Japan on 2014-11-23.701. The spectrum is dominated by absorption lines of H-alpha (equivalent width 0.18 nm), H-beta (EW = 0.81 nm), Na I D (EW = 0.46 nm), Ba II 649.7 (EW = 0.15 nm), Mg I 516.7 (EW = 0.22 nm), Li 670.6 (EW = 0.05 nm) and DIB 628.4. No strong emission features are present in the spectrum. The overall appearance of the spectrum is similar to that of FU Ori. The spectrum is posted at the following web-site: http://otobs.org/FBO/2mass_id121888314.htm.
These features suggest that the object is a YSO undergoing an FU Ori-type outburst.