An X-ray and Optical Study of the Dwarf Nova Candidate OGLE-BLG-DN-0064

Abstract

The source OGLE-BLG-DN-0064 (hereafter OGLE64) was classified as a potential dwarf nova based on its regular outburst activity revealed by the OGLE optical survey. In this paper, we investigate the X-ray and optical emissions from the source OGLE64 based on archival Chandra and Swift X-ray data and our optical observations with the 6-m BTA telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences. OGLE64 shows an X-ray luminosity $L_X\approx 1.6\times 10^{32}{\text{erg s}}^{-1}$ and a high X-ray-to-optical flux ratio $F_X/F_{\text{opt}}\approx 1.5$, typical for accreting white dwarfs. The X-ray spectrum of OGLE64 is better fitted by the models of a power law with a photon index $\Gamma \approx 1.9$ and an optically thin plasma with a temperature $kT\approx 6.4\text{keV}$. The optical spectrum shows hydrogen and neutral helium emission lines, in some of which a double-peaked structure is observed. An analysis of the outburst activity of OGLE64, based on data from the OGLE, ZTF, ATLAS, and ASAS-SN optical surveys, has revealed superoutbursts with a characteristic supercycle $P_{\text{super}}\approx 400\text{days}$. We found no significant variability in either the X-ray or optical light curves of OGLE64 that could be associated with the change in the visibility conditions for the emitting regions at different orbital phases. Our estimates of the orbital period of the system by indirect methods show that the period probably lies in the range $P_{\text{orb}}\sim 1.5-3.5\text{h}$. The properties of the X-ray and optical emissions from OGLE64 lead us to conclude that the system is an SU UMa-type dwarf nova.

arXiv comment11 pages, 7 figures

References in corpus (30)

• On the Absorption of X-rays in the Interstellar Medium
• The Swift X-ray Telescope
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• Understanding the Lomb-Scargle Periodogram
• ATLAS: A High-Cadence All-Sky Survey System
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• The disc instability model of dwarf-novae and low-mass X-ray binary transients
• The SDSS View of the Palomar-Green Bright Quasar Survey
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• The Chandra Source Catalog
• The SCORPIO focal reducer
• The Donor Stars of Cataclysmic Variables
• Gaia Early Data Release 3: The Gaia Catalogue of Nearby Stars
• X-ray Emissions from Accreting White Dwarfs: a Review
• 2SXPS: An improved and expanded Swift X-ray telescope point source catalog
• Gaia Data Release 3. Summary of the variability processing and analysis
• WZ Sge-Type Dwarf Novae
• Empirical temperature- and extinction-dependent extinction coefficients for the GALEX, Pan-STARRS1, Gaia, SDSS, 2MASS, and WISE passbands
• The Kepler Light Curve of V344 Lyrae: Constraining the Thermal-Viscous Limit Cycle Instability
• Statistical analysis of properties of dwarf novae outbursts
• The cataclysmic variable orbital period gap: More evident than ever
• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• NY Serpentis: SU UMa-Type Nova in the Period Gap with Diversity of Normal Outbursts
• An Empirical Correlation of $T_{\max }$ - $M_{\mathrm{WD}}$ of Dwarf Novae and The Average White Dwarf Mass in Cataclysmic Variables in the Galactic Bulge
• BO Ceti: Dwarf Nova Showing Both IW And and SU UMa-Type Features
• A Comprehensive K2 and Ground-Based Study of CRTS J035905.9+175034, an Eclipsing SU UMa System with a Large Mass Ratio
• ASASSN-18aan: An Eclipsing SU UMa-type Cataclysmic Variable with a 3.6-hour Orbital Period and a Late G-type Secondary Star
• X-ray observations of historical classical nova counterparts with eROSITA telescope aboard SRG orbital observatory during the all-sky survey

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