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Discovery of a high state AM CVn binary in the Galactic Bulge Survey | | T. Wevers
; M. A. P. Torres
; P. G. Jonker
; J. D. Wetuski
; G. Nelemans
; D. Steeghs
; T. J. Maccarone
; C. Heinke
; R. I. Hynes
; A. Udalski
; Z. Kostrzewa-Rutkowska
; P. J. Groot
; R. Gazer
; M. K. Szymanski
; C. T. Britt
; L. Wyrzykowski
; R. Poleski
; | | Date: |
14 Jul 2016 | | Abstract: | We report on the discovery of a hydrogen-deficient compact binary (CXOGBS
J175107.6-294037) belonging to the AM CVn class in the Galactic Bulge Survey.
Deep archival X-ray observations constrain the X-ray positional uncertainty of
the source to 0.57 arcsec, and allow us to uniquely identify the optical and UV
counterpart. Optical spectroscopic observations reveal the presence of broad,
shallow He i absorption lines while no sign of hydrogen is present, consistent
with a high state system. We present the optical lightcurve from Optical
Gravitational Lensing Experiment monitoring, spanning 15 years. It shows no
evidence for outbursts; variability is present at the 0.2 mag level on
timescales ranging from hours to weeks. A modulation on a timescale of years is
also observed. A Lomb-Scargle analysis of the optical lightcurves shows two
significant periodicities at 22.90 and 23.22 min. Although the physical
interpretation is uncertain, such timescales are in line with expectations for
the orbital and superhump periods. We estimate the distance to the source to be
between 0.5 - 1.1 kpc. Spectroscopic follow-up observations are required to
establish the orbital period, and to determine whether this source can serve as
a verification binary for the eLISA gravitational wave mission. | | Source: | arXiv, 1607.4262 | | Services: | Forum | Review | PDF | Favorites | |
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