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

• DOI: 10.1093/mnras/stab2948
• Publication Date: 2021-10-11T19:31:51Z
• Authors: Christopher J Manser; Erik Dennihy; Boris T Gänsicke; John H Debes; Nicola P Gentile ...; J J Hermes; Mark Hollands; Paula Izquierdo; B C Kaiser; T R Marsh; Joshua S Reding; Pablo Rodríguez-Gil; Dimitri Veras; David J Wilson
• Keywords: Color doppler

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