Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83

Abstract

Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the DA white dwarf WDJ181417.84$-$735459.83, an object originally identified to have a strong infrared excess in the 2MASS and WISE catalogues that we confirmed to be intrinsic to the white dwarf, and likely corresponding to the emission of a dusty disc around the star. The finding of Ca, Fe and Mg absorption lines in two X-SHOOTER spectra of the white dwarf, taken 8 years apart, is further evidence of accretion from a dusty disc. We do not report variability in the absorption lines between these two spectra. Fitting a blackbody model to the infrared excess gives a temperature of 910$\pm 50$ K. We have estimated a total accretion flux from the spectroscopic metal lines of $|\dot{\mathrm{M}}|=1.784\times 10^9$g s${}^{-1}$.

arXiv commentAccepted for publication in MNRAS. 11 pages, 10 figures, 6 tables

References in corpus (63)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Gaia Data Release 2: The astrometric solution
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• The SuperCOSMOS Sky Survey. Paper I: Introduction and Description
• Density of asteroids
• A Tidally-Disrupted Asteroid Around the White Dwarf G29-38
• Absolute Calibration of the Infrared Array Camera on the Spitzer Space Telescope
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• The WFCAM Science Archive
• The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging
• A gaseous metal disk around a white dwarf
• Ancient planetary systems are orbiting a large fraction of white dwarf stars
• Infrared Signatures of Disrupted Minor Planets at White Dwarfs
• The White Dwarf Initial-Final Mass Relation for Progenitor Stars From 0.85 to 7.5 M${}_{\odot }$
• Point Source Extraction with MOPEX
• Accretion and diffusion in white dwarfs. New diffusion timescales and applications to GD362 and G29-38
• Circumstellar Debris and Pollution at White Dwarf Stars
• The VISTA Science Archive
• Accretion of a giant planet onto a white dwarf
• Constraints on the Lifetimes of Disks Resulting from Tidally Destroyed Rocky Planetary Bodies
• The New Class of Dusty DAZ White Dwarfs
• Six White Dwarfs with Circumstellar Silicates
• The frequency and infrared brightness of circumstellar discs at white dwarfs
• The WIRED Survey II: Infrared Excesses in the SDSS DR7 White Dwarf Catalog
• Stochastic accretion of planetesimals onto white dwarfs: constraints on the mass distribution of accreted material from atmospheric pollution
• The Discovery of the Most Metal-Rich White Dwarf: Composition of a Tidally Disrupted Extrasolar Dwarf Planet
• Chemistry of Impact-Generated Silicate Melt-Vapor Debris Disks
• Doppler-imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9
• Cool DZ white dwarfs I: Identification and spectral analysis
• The carbon footprint of large astronomy meetings
• Scars of Intense Accretion Episodes at Metal-Rich White Dwarfs
• Sloan Digital Sky Survey Imaging of Low Galactic Latitude Fields: Technical Summary and Data Release
• Revised Gaia Data Release 2 passbands
• Compositions of Planetary Debris around Dusty White Dwarfs
• Interpretation and diversity of exoplanetary material orbiting white dwarfs
• New white dwarf envelope models and diffusion. Application to DQ white dwarfs
• Rocky Planetesimals as the Origin of Metals in DZ Stars
• The frequency of gaseous debris discs around white dwarfs
• The Drop during Less than 300 days of a Dusty White Dwarf's Infrared Luminosity
• IRAC Observations of Planetary Nebulae
• Rapid Evolution of the Gaseous Exoplanetary Debris Around the White Dwarf Star HE 1349--2305
• White dwarfs with planetary remnants in the era of Gaia I: six emission line systems
• Most white dwarfs with detectable dust discs show infrared variability
• The dust never settles: collisional production of gas and dust in evolved planetary systems
• Another one grinds the dust: Variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2
• Five New Post-Main-Sequence Debris Disks with Gaseous Emission
• Dusty WDs in the $WISE$ All Sky Survey $\cap$ SDSS
• A Word to the WISE: Confusion is Unavoidable for WISE-selected Infrared Excesses
• The lifetimes of planetary debris discs around white dwarfs
• A Second Look at the Metal Line Variability of G29-38
• Atmospheric circulation of tidally locked gas giants with increasing rotation and implications for white-dwarf-brown-dwarf systems
• Discovery of a widely separated UCD-WD binary
• Cool white dwarfs as standards for infrared observations
• Near-infrared variability in dusty white dwarfs: tracing the accretion of planetary material

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