Spectroscopic confirmation of the dwarf nova nature for TCP J12363806+021
ATel #15992; I. Perez-Garcia (IAA-CSIC), R. Sanchez-Ramirez (IAA-CSIC), Y.-D. Hu (IAA-CSIC), E. Fernandez-Garcia (IAA-CSIC), S. Guziy (IAA-CSIC), M. D. Caballero-Garcia (IAA-CSIC), G. Bergond (CAHA) and A. J. Castro-Tirado (IAA-CSIC)
on 17 Apr 2023; 22:26 UT
Credential Certification: Alberto J. Castro-Tirado (ajct@iaa.es)
Subjects: Optical, Cataclysmic Variable, Variables
On April 13, 2023, at 23:09 UT, the wide field BOOTES-1C telescope at ESAt/INTA-CEDEA (Huelva, Spain), as part of the BOOTES global network of robotic telescopes, detected a very significant increase in brightness from a source at coordinates RA = 12:36:38.04 Dec = +02:13:27.2 (J2000). The source, previously recorded by PanSTARRS (objID - 110661891585629559) at a much fainter optical state, experienced a change in magnitude from 21.6 to 14.2 (g). The outburst of this source was independently reported on the same day at several CBAT Transient Objects Follow-ups (F. Watanabe) and VSNT reports (T. Vanmunster; T. Kato, #27644).
Our multicolour follow-up observations at the BOOTES-5/JG telescope in San Pedro Martir Observatory (Mexico) on Apr 14, 07:32 UT revealed a very blue source, confirmed by a low-resolution spectrum taken on Apr 14, 21:30 UT by the BOOTES-2/TELMA telescope (+COLORES spectrograph) at the IHSM/UMA-CSIC station in Malaga (Spain).
On Apr 15, 21:06 UT, a medium-resolution spectrum was obtained at the 2.2-meter CAHA telescope (+CAFOS), showing hydrogen and helium absorption lines superimposed to a very blue continuum. The recorded spectrum is consistent with that of a dwarf nova in outburst and we propose to classify this source as a SU UMA-type, based on the similarity of its spectrum to the FQ Mon spectrum during its outburst in Mar 2004 (Schmidtobreick et al. 2005, PASP 117, 944).
