New Cataclysmic Variables and other Exotic Binaries in the Globular Cluster 47 Tucanae

Abstract

We present 22 new (+3 confirmed) cataclysmic variables (CVs) in the non core-collapsed globular cluster 47 Tucanae (47 Tuc). The total number of CVs in the cluster is now 43, the largest sample in any globular cluster so far. For the identifications we used near-ultraviolet (NUV) and optical images from the Hubble Space Telescope, in combination with X-ray results from the Chandra X-ray Observatory. This allowed us to build the deepest NUV CV luminosity function of the cluster to date. We found that the CVs in 47 Tuc are more concentrated towards the cluster center than the main sequence turnoff stars. We compared our results to the CV populations of the core-collapsed globular clusters NGC 6397 and NGC 6752. We found that 47 Tuc has fewer bright CVs per unit mass than those two other clusters. That suggests that dynamical interactions in core-collapsed clusters play a major role creating new CVs. In 47 Tuc, the CV population is probably dominated by primordial and old dynamically formed systems. We estimated that the CVs in 47 Tuc have total masses of approx. 1.4 M_sun. We also found that the X-ray luminosity function of the CVs in the three clusters is bimodal. Additionally, we discuss a possible double degenerate system and an intriguing/unclassified object. Finally, we present four systems that could be millisecond pulsar companions given their X-ray and NUV/optical colors. For one of them we present very strong evidence for being an ablated companion. The other three could be CO- or He-WDs.

arXiv commentPublished on MNRAS. 31 Pages, 23 Figures, 5 Tables. Minor changes with respect to previous arXiv version

References in corpus (73)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
• WFPC2 Stellar Photometry with HSTphot
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• The Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
• X-ray Emissions from Accreting White Dwarfs: a Review
• An Exploration of the Paradigm for the 2-3 Hour Period Gap in Cataclysmic Variables
• SDSS unveils a population of intrinsically faint cataclysmic variables at the minimum orbital period
• Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
• Gemini and Hubble Space Telescope Evidence for an Intermediate Mass Black Hole in omega Centauri
• High Resolution X-ray Imaging of a Globular Cluster Core: Compact Binaries in 47Tuc
• A Deep Chandra Survey of the Globular Cluster 47 Tucanae: Catalog of Point Sources
• The Frequency of Binary Stars in the Core of 47 Tucanae
• Monte Carlo Simulations of Globular Cluster Evolution. III. Primordial Binary Interactions
• The masses of the millisecond pulsar J1012+5307 and its white-dwarf companion
• Formation and evolution of compact binaries in globular clusters: I.Binaries with white dwarfs
• Chandra Exposes the Core Collapsed Globular Cluster NGC 6397
• Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae
• Deep radio imaging of 47 Tuc identifies the peculiar X-ray source X9 as a new black hole candidate
• The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
• Stellar Encounter Rate in Galactic Globular Clusters
• The masses of PSR J1911-5958A and its white dwarf companion
• An Extensive Census of HST Counterparts to Chandra X-ray Sources in the Globular Cluster 47 Tucanae. I. Astrometry and Photometry
• 1RXS J232953.9+062814: A Dwarf Nova with a 64-minute Orbital Period and a Conspicuous Secondary Star
• Optical Identification of Multiple Faint X-ray Sources in the Globular Cluster NGC 6752: Evidence for Numerous Cataclysmic Variables
• Measuring Consistent Masses for 25 Milky Way Globular Clusters
• Evolution and colours of helium-core white dwarf stars: the case of low metallicity progenitors
• Cataclysmic Variables from SDSS. VIII. The Final Year (2007-2008)
• An Extensive Census of HST Counterparts to Chandra X-ray Sources in the Globular Cluster 47 Tucanae. II. Time Series and Analysis
• RXJ0806.3+1527: a double degenerate binary with the shortest known orbital period (321s)
• A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
• A Far-Ultraviolet Survey of 47 Tucanae. I. Imaging
• The Thermal State of the Accreting White Dwarf in AM Canum Venaticorum Binaries
• A Chandra X-ray Observatory Study of PSR J1740--5340 and Candidate Millisecond Pulsars in the Globular Cluster NGC 6397
• The space density of magnetic cataclysmic variables
• Identification of Faint Chandra X-ray Sources in the Core-Collapsed Globular Cluster NGC 6397: Evidence for a Bimodal Cataclysmic Variable Population
• The light curve of the companion to PSR B1957+20
• Stellar Exotica in 47 Tucanae
• The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster
• A Millisecond Pulsar Optical Counterpart with Large-Amplitude Variability in the Globular Cluster 47 Tucanae
• Discovery of Two New Pulsars in 47 Tucanae (NGC 104)
• A Far-Ultraviolet Survey of 47 Tucanae.II The Long-Period Cataclysmic Variable AKO 9
• Chandra X-ray Sources in the Collapsed-Core Globular Cluster M30 (NGC 7099)
• Resolving the Controversy Over the Core Radius of 47 Tucanae (NGC 104)
• A direct N-body model of core-collapse and core oscillations
• 2FGL J1653.6-0159: A New Low in Evaporating Pulsar Binary Periods
• White dwarf masses in cataclysmic variables
• MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- I. cataclysmic variables -- present-day population
• Deep HST Imaging in NGC 6397: Stellar Dynamics
• A Chandra Look at the X-ray Faint Millisecond Pulsars in the Globular Cluster NGC 6752
• 1Gyr in the Life of the Globular Cluster NGC 6397
• The Properties of Cataclysmic Variables In Photometric Halpha Surveys
• A Far-UV Survey of M 80: X-ray Source Counterparts, Strange Blue Stragglers and the Recovery of Nova T Sco
• Dynamical Formation of Cataclysmic Variables in Globular Clusters
• XMM-Newton observations of AM CVn binaries: V396 Hya & SDSS J1240-01
• HST/ACS Imaging of Omega Centauri: Optical Counterparts of Chandra X-Ray Sources
• The Chandra ACIS Timing Survey Project: glimpsing a sample of faint X-ray pulsators
• X-ray Binaries in the Ultrahigh Encounter Rate Globular Cluster NGC 6388
• Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae
• Radio Timing and Optical Photometry of the Black Widow System PSR J1953+1846A in the Globular Cluster M71
• Combined Chandra, XMM-Newton and Hubble Space Telescope observations of the Galactic globular cluster NGC 2808
• ChaMPlane Deep Galactic Bulge Survey. I. Faint accretion-driven binaries in the Limiting Window
• MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- III. Cataclysmic variables -- Implications of model assumptions
• Study of HST counterparts to Chandra X-ray sources in the Globular Cluster M71
• Weighing stars: the identification of an Evolved Blue Straggler Star in the globular cluster 47 Tucanae
• Identification of Faint Chandra X-ray Sources in the Core-Collapsed Globular Cluster NGC 6752
• Hα photometry of low mass stars in 47 Tucanae: chromospheric activity and exotica
• The emission-line pulse pattern in the intermediate polar RX J0558
• HS 0943+1404, a true intermediate polar
• MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- II. Cataclysmic variables -- progenitors and population at birth
• A multi-wavelength survey of NGC\,6752: X-ray counterparts, two new dwarf novae, and a core-collapsed radial profile
• A far-ultraviolet variable with an 18-minute period in the globular cluster NGC 1851
• Simultaneous UBVRI observations of the cataclysmic variable AE Aquarii: temperature and mass of fireballs

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• A stellar census in globular clusters with MUSE: Binaries in NGC 3201
• MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- IV. cataclysmic variables -- properties of bright and faint populations
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• Periodic X-ray sources in the Massive Globular Cluster 47 Tucanae: Evidence for Dynamically Formed Cataclysmic Variables
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• A 2 day orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397
• Near-ultraviolet detections of four dwarf nova candidates in the globular cluster 47 Tucanae
• Investigating the UV-excess in star clusters with $N$-body simulations: predictions for future CSST observations
• Astrophysics with the Laser Interferometer Space Antenna
• The fractions of post-binary-interaction stars and evolved blue straggler stars on the red giant branch of globular clusters
• Influences of dynamical disruptions on the evolution of pulsars in globular clusters
• Reevaluating the Origin of Detectable Cataclysmic Variables in Globular Clusters: Testing the Importance of Dynamics
• The MAVERIC Survey: Dynamical Origin of Radio Sources in Galactic Globular Clusters
• Exploration of faint X-ray and radio sources in the massive globular cluster M14: A UV-bright counterpart to Nova Ophiuchus 1938
• Are most Cataclysmic Variables in Globular Clusters dynamically formed?
• TUVO-21acq: a new cataclysmic variable discovered through a UV outburst
• On the nature of the 2.4 hr-period eclipsing cataclysmic variable W2 in 47 Tuc