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VVV-NOV-005: the first VVV Galactic nova candidate in the disk area

ATel #7124; R. K. Saito (Universidade Federal de Sergipe), D. Minniti (Universidad Andres Bello, Vatican Observatory, Millennium Institute of Astrophysics), R. Angeloni (Gemini Observatory), I. Dekany (Millennium Institute of Astrophysics, Pontificia Universidad Catolica de Chile), M. Catelan (Pontificia Universidad Catolica de Chile, Millennium Institute of Astrophysics)
on 22 Feb 2015; 23:18 UT
Credential Certification: Roberto Saito (saito@ufs.br)

Subjects: Infra-Red, Nova, Transient

We report the discovery of the first likely nova by the VVV Survey in its disk area (vvvsurvey.org; Minniti et al. 2010, New Astronomy, 15, 433). Observations taken during 2010-2012 show the presence of a stellar source fading in brightness from March 06 2010 to May 11 2012 (see table below). VVV-NOV-005 follows the expected behavior of a nova during outburst, fading by Delta_Ks=7.4 mag over 797 days. Its light curve exhibits similar behavior as the other novae previously discovered by the VVV Survey towards the Galactic bulge (ATel#4426, ATel#4830, ATel#6022).

The coordinates of VVV-NOV-005 are (RA,DEC)=16:21:59.09,-51:08:41.00, corresponding to (l,b)=-27.1547,-0.9312. The nova outburst occurred before the first VVV observation of the field on March 06 2010, when the object is seen as a saturated source with Ks=9.42 mag. On March 25 2010 the object shows Ks=11.37 mag and (J-Ks)=1.48 mag. VVV-NOV-005 is beyond detection in several Ks-band observations taken in year 2013, which allow us to infer that the nova remnant is fainter than the limiting magnitude of Ks=18.2 mag in the field. There are no previous entries in the literature for the target position.

VVV-NOV-005 Table of Observations 
Date  (UT)     filter   mag    flag 
2010-03-06.34831 Ks  9.42+/-0.01 -9 
2010-03-25.26024 H  11.62+/-0.01 -9 
2010-03-25.26496 Ks 11.37+/-0.01 -1 
2010-03-25.26964 J  12.85+/-0.01 -1 
2010-09-28.00130 Ks 12.25+/-0.01 -1 
2011-05-16.26996 Ks 14.29+/-0.02 -1 
2011-05-17.27291 Ks 14.23+/-0.02 -1 
2011-05-18.27692 Ks 14.22+/-0.02 -1 
2011-07-01.19762 Y  17.85+/-0.03 -1 
2011-07-01.20233 Z  19.42+/-0.08 +1 
2011-08-27.00848 Ks 14.91+/-0.04 -1 
2011-09-12.07537 Ks 15.20+/-0.05 -1 
2012-03-07.29678 Ks 16.38+/-0.12 -1 
2012-03-11.31323 Ks 16.46+/-0.13 -1 
2012-05-11.32050 Ks 16.82+/-0.16 -1 
2013-05-27.30766 Ks beyond detection 
2013-06-28.17154 Ks beyond detection 
2013-07-02.06749 Ks beyond detection 
2013-07-14.98623 Ks beyond detection 
2013-07-15.13449 Ks beyond detection 
2013-07-16.03030 Ks beyond detection 
2013-07-16.17911 Ks beyond detection 
2013-07-17.00366 Ks beyond detection 
2013-07-17.03841 Ks beyond detection 
2013-07-17.08719 Ks beyond detection 
2013-07-17.13509 Ks beyond detection 
2013-07-17.18206 Ks beyond detection 
2013-07-18.98174 Ks beyond detection 
2013-07-19.02979 Ks beyond detection 
2013-07-19.07705 Ks beyond detection 
2013-07-19.18889 Ks beyond detection 
2013-07-24.10808 Ks beyond detection 
2013-07-29.00462 Ks beyond detection 
2013-07-30.00067 Ks beyond detection 
2013-07-31.01465 Ks beyond detection 
2013-07-31.07514 Ks beyond detection 
The VVV data are in the natural VISTA Vegamag system. Photometric flags are described in Saito et al. 2012 (A&A, 537, A107)

Acknowledgments: We gratefully acknowledge use of data from the ESO Public Survey programme ID 179.B-2002 taken with the VISTA telescope, and data products from the Cambridge Astronomical Survey Unit. R.K.S. acknowledges support from CNPq/Brazil.