Velocity-imaging the rapidly precessing planetary disc around the white dwarf HE 1349-2305 using Doppler tomography

Abstract

The presence of planetary material in white dwarf atmospheres, thought to be accreted from a dusty debris disc produced via the tidal disruption of a planetesimal, is common. Approximately five per cent of these discs host a co-orbital gaseous component detectable via emission from atomic transitions - usually the 8600 Angstrom CaII triplet. These emission profiles can be highly variable in both morphology and strength. Furthermore, the morphological variations in a few systems have been shown to be periodic, likely produced by an apsidally precessing asymmetric disc. Of the known gaseous debris discs, that around HE1349-2305 has the most rapidly evolving emission line morphology, and we present updated spectroscopy of the CaII triplet of this system. The additional observations show that the emission line morphologies vary periodically and consistently, and we constrain the period to two aliases of 459$\pm$3d and 502$\pm$3d. We produce images of the CaII triplet emission from the disc in velocity space using Doppler tomography - only the second such imaging of a white dwarf debris disc. We suggest that the asymmetric nature of these velocity images is generated by gas moving on eccentric orbits with radially-dependent excitation conditions via photo-ionisation from the white dwarf. We also obtained short-cadence (~ 4 min) spectroscopy to search for variability on the time-scale of the disc's orbital period (~ hours) due to the presence of a planetesimal, and rule out variability at a level of ~ 1.4 per cent.

14 Pages, 10 Figures, accepted for publication in MNRAS

References in corpus (37)

• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• The frequency of planetary debris around young white dwarfs
• A gaseous metal disk around a white dwarf
• Pollution of single white dwarfs by accretion of many small asteroids
• Formation of planetary debris discs around white dwarfs I: Tidal disruption of an extremely eccentric asteroid
• A Giant Planet Candidate Transiting a White Dwarf
• A planetesimal orbiting within the debris disc around a white dwarf star
• Accretion of a giant planet onto a white dwarf
• The frequency and infrared brightness of circumstellar discs at white dwarfs
• The Chemical Composition of an Extrasolar Kuiper-Belt-Object
• I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
• Numerical Simulations of Collisional Cascades at the Roche Limits of White Dwarf Stars
• Tidal disruption of planetary bodies by white dwarfs I: A hybrid SPH-analytical approach
• The frequency of gaseous debris discs around white dwarfs
• The Drop during Less than 300 days of a Dusty White Dwarf's Infrared Luminosity
• Tidal disruption of planetary bodies by white dwarfs II: Debris disc structure and ejected interstellar asteroids
• Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328$-$1219
• Numerical Simulations of Gaseous Disks Generated from Collisional Cascades at the Roche Limits of White Dwarf Stars
• Serendipitous Discovery of Nine White Dwarfs With Gaseous Debris Disks
• White dwarfs with planetary remnants in the era of Gaia I: six emission line systems
• Infrared Excesses around Bright White Dwarfs from Gaia and unWISE I
• Most white dwarfs with detectable dust discs show infrared variability
• Evidence for eccentric, precessing gaseous debris in the circumstellar absorption towards WD 1145+017
• Five New Post-Main-Sequence Debris Disks with Gaseous Emission
• Another one grinds the dust: Variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2
• The dust never settles: collisional production of gas and dust in evolved planetary systems
• Cold giant planets evaporated by hot white dwarfs
• Circularization of tidal debris around white dwarfs: implications for gas production and dust variability
• Modeling of the Variable Circumstellar Absorption Features of WD 1145+017
• A Word to the WISE: Confusion is Unavoidable for WISE-selected Infrared Excesses
• Non-LTE models for the gaseous metal component of circumstellar discs around white dwarfs
• Collisions in a gas-rich white dwarf planetary debris disc
• A Characterization of the Circumstellar Gas around WD 1124-293 using Cloudy
• Optical spectroscopy of the dwarf nova U Geminorum
• Formation of eccentric gas discs from sublimating or partially disrupted asteroids orbiting white dwarfs
• The gaseous debris disk of the white dwarf SDSS J1228+1040. HST/COS search for far-ultraviolet signatures

Cited by in corpus (5)

• A DZ white dwarf with a 30 MG magnetic field
• PEWDD: A database of white dwarfs enriched by exo-planetary material
• Planetesimals drifting through dusty and gaseous white dwarf debris discs: Types I, II and III-like migration
• Disruption of exo-asteroids around white dwarfs and the release of dust particles in debris rings in co-orbital motion
• Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy