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Signs of a faint disc population at polluted white dwarfs
Carolina Bergfors, Jay Farihi, Patrick Dufour +1
Observations of atmospheric metals and dust discs around white dwarfs provide important clues to the fate of terrestrial planetary systems around intermediate mass stars. We presen…
The frequency and infrared brightness of circumstellar discs at white dwarfs
M. Rocchetto, J. Farihi, B. T. Gaensicke +1
White dwarfs whose atmospheres are polluted by terrestrial-like planetary debris have become a powerful and unique tool to study evolved planetary systems. This paper presents resu…
ALMA and Herschel Observations of the Prototype Dusty and Polluted White Dwarf G29-38
J. Farihi, M. C. Wyatt, J. S. Greaves +3
ALMA Cycle 0 and Herschel PACS observations are reported for the prototype, nearest, and brightest example of a dusty and polluted white dwarf, G29-38. These long wavelength progra…
Heavy metals in a light white dwarf: Abundances of the metal-rich, extremely low-mass GALEX J1717+6757
J. J. Hermes, B. T. Gaensicke, D. Koester +9
Using the Hubble Space Telescope, we detail the first abundance analysis enabled by far-ultraviolet spectroscopy of a low-mass (~0.19 Msun) white dwarf (WD), GALEX J1717+6757, whic…
The puzzling source IGR J17361-4441 in NGC 6388: a possible planetary tidal disruption event
Melania Del Santo, Achille A. Nucita, Giuseppe Lodato +5
On 2011 August 11, INTEGRAL discovered the hard X-ray source IGR J17361-4441 near the centre of the globular cluster NGC 6388. Follow up observations with Chandra showed the positi…
The frequency of planetary debris around young white dwarfs
Detlev Koester, Boris T. Gänsicke, Jay Farihi
(Abridged) We present the results of the first unbiased survey for metal pollution among H-atmosphere (DA) white dwarfs with cooling ages of 20-200 Myr and 17000K < Teff < 27000K,…