Silicate features in Galactic and extragalactic post-AGB discs

Aims. In this paper we study the Spitzer and TIMMI2 infrared spectra of post-AGB disc sources, both in the Galaxy and the LMC. Using the observed infrared spectra we determine the mineralogy and dust parameters of the discs, and look for possible differences between the Galactic and extragalactic sources.Methods. Modelling the full spectral range observed allows us to determine the dust species present in the disc and different physical parameters such as grain sizes, dust abundance ratios, and the dust and continuum temperatures.Results. We find that all the discs are dominated by emission features of crystalline and amorphous silicate dust. Only a few sample sources show features due to CO2 gas or carbonaceous molecules such as PAHs and C-60 fullerenes. Our analysis shows that dust grain processing in these discs is strong, resulting in large average grain sizes and a very high crystallinity fraction. However, we do not find any correlations between the derived dust parameters and properties of the central source. There also does not seem to be a noticeable difference between the mineralogy of the Galactic and LMC sources. Even though the observed spectra are very similar to those of protoplanetary discs around young stars, showing similar mineralogy and strong grain processing, we do find evidence for differences in the physical and chemical processes of the dust processing.

[1]  S. Srinivasan,et al.  The mass-loss return from evolved stars to the Large Magellanic Cloud - V. The GRAMS carbon-star model grid , 2011, 1106.3256.

[2]  N. Smith,et al.  A disc inside the bipolar planetary nebula M2-9 , 2010, 1011.5671.

[3]  Jan Cami,et al.  Detection of C60 and C70 in a Young Planetary Nebula , 2010, Science.

[4]  I. Song,et al.  SHOCKS AND A GIANT PLANET IN THE DISK ORBITING BP PISCIUM? , 2010, 1008.1775.

[5]  M. Min,et al.  DUST EVOLUTION IN PROTOPLANETARY DISKS AROUND HERBIG Ae/Be STARS—THE SPITZER VIEW , 2010, 1008.0083.

[6]  R. Sahai,et al.  THE DUSTY CIRCUMSTELLAR DISKS OF B[e] SUPERGIANTS IN THE MAGELLANIC CLOUDS , 2010 .

[7]  Joana M. Oliveira,et al.  The SAGE-Spec Spitzer Legacy Program: The Life Cycle of Dust and Gas in the Large Magellanic Cloud , 2010, 1004.1142.

[8]  D. Lin,et al.  DUSTY DISKS AROUND WHITE DWARFS. I. ORIGIN OF DEBRIS DISKS , 2010, 1004.0696.

[9]  R. Indebetouw,et al.  Chemical depletion in the Large Magellanic Cloud: RV Tauri stars and the photospheric feedback from their dusty discs. ? , 2009, 0910.5624.

[10]  H. Winckel,et al.  Analysis of the infrared spectra of the peculiar post-AGB stars EP Lyrae and HD 52961 , 2009, 0906.4718.

[11]  G. Raskin,et al.  Post-AGB stars with hot circumstellar dust: binarity of the low-amplitude pulsators , 2009, 0906.4482.

[12]  T. Verhoelst,et al.  The dust condensation sequence in red supergiant stars , 2009, 0901.1262.

[13]  K. H. Kim,et al.  SILICA IN PROTOPLANETARY DISKS , 2008, 0811.3590.

[14]  H. Winckel,et al.  SPITZER survey of dust grain processing in stable discs around binary post-AGB stars , 2008, 0809.2505.

[15]  C. Waelkens,et al.  A SPECTROSCOPIC AND PHOTOMETRIC STUDY OF THE METAL-POOR, PULSATING, POST-ASYMPTOTIC GIANT BRANCH BINARY HD 46703 , 2008, 0807.3752.

[16]  A. Ginsburg,et al.  The optically bright post-AGB population of the LMC , 2008, Proceedings of the International Astronomical Union.

[17]  J. Hovenier,et al.  The infrared emission spectra of compositionally inhomogeneous aggregates composed of irregularly shaped constituents , 2008, 0806.4038.

[18]  Michael R. Meyer,et al.  The Formation and Evolution of Planetary Systems: Grain Growth and Chemical Processing of Dust in T Tauri Systems , 2008, 0802.3033.

[19]  H. Winckel,et al.  Dust-grain processing in circumbinary discs around evolved binaries. The RV Tauri spectral twins RU Centauri and AC Herculis , 2007, 0709.3197.

[20]  T. Verhoelst,et al.  Direct diameter measurement of a star filling its Roche lobe. The semi-detached binary SS Leporis spatially resolved with VINCI/VLTI , 2007, 0705.4410.

[21]  J. Blommaert,et al.  Luminosities and mass-loss rates of carbon stars in the Magellanic Clouds , 2007 .

[22]  T. Verhoelst,et al.  The circumbinary disc around the J-type C-star IRAS 18006-3213 , 2007, astro-ph/0703258.

[23]  H. Winckel,et al.  First detection of photospheric depletion in the Large Magellanic Cloud , 2007, astro-ph/0701327.

[24]  T. Lebzelter,et al.  Tracing the Development of Dust around Evolved Stars: The Case of 47 Tuc , 2006, astro-ph/0611167.

[25]  S. Kwok,et al.  A Slowly Expanding Disk and Fast Bipolar Outflow from the S Star π1 Gruis , 2006 .

[26]  S. Wolf,et al.  A close look into the carbon disk at the core of the planetary nebula CPD-56°8032 , 2006, astro-ph/0606745.

[27]  H. Winckel,et al.  Keplerian discs around post-AGB stars: a common phenomenon? , 2006, astro-ph/0601578.

[28]  M. Min,et al.  Resolving the compact dusty discs around binary post-AGB stars using N-band interferometry , 2006, astro-ph/0601169.

[29]  Linda J. Smith,et al.  SPITZER SURVEY OF THE LARGE MAGELLANIC CLOUD, SURVEYING THE AGENTS OF A GALAXY'S EVOLUTION (SAGE). IV. DUST PROPERTIES IN THE INTERSTELLAR MEDIUM , 2005, Proceedings of the International Astronomical Union.

[30]  J. Hovenier,et al.  The 10 μm amorphous silicate feature of fractal aggregates and compact particles with complex shapes , 2005, astro-ph/0509376.

[31]  B. Zuckerman,et al.  A Dusty Disk around GD 362, a White Dwarf with a Uniquely High Photospheric Metal Abundance , 2005, astro-ph/0509193.

[32]  C. Dominik,et al.  A 10 μm spectroscopic survey of Herbig Ae star disks: Grain growth and crystallization , 2005, astro-ph/0503507.

[33]  J. Hovenier,et al.  Modeling optical properties of cosmic dust grains using a distribution of hollow spheres , 2005, astro-ph/0503068.

[34]  Austin,et al.  Depletion in post-AGB stars with a dusty disc. II. , 2005, astro-ph/0501469.

[35]  Michael MayerWolfgang J. Duschl.  Stationary Population III accretion discs , 2004, astro-ph/0406501.

[36]  Yevgen Grynko,et al.  Light scattering by media composed of semitransparent particles of different shapes in ray optics approximation: consequences for spectroscopy, photometry, and polarimetry of planetary regoliths , 2005 .

[37]  E. Wright,et al.  The Spitzer Space Telescope Mission , 2004, astro-ph/0406223.

[38]  C. Dominik,et al.  UvA-DARE ( Digital Academic Repository ) Flaring vs . self-shadowed disks : The SEDs of Herbig Ae / Be stars , 2004 .

[39]  H. Gail.  Radial mixing in protoplanetary accretion disks IV. Metamorphosis of the silicate dust complex , 2004 .

[40]  Richard G. Arendt,et al.  Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints , 2003, astro-ph/0312641.

[41]  C. Dominik,et al.  Grain growth in the inner regions of Herbig Ae/Be star disks , 2003 .

[42]  M. Jura.  A Flared, Orbiting, Dusty Disk around HD 233517 , 2002, astro-ph/0209272.

[43]  A. Moorwood,et al.  Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, , 2003 .

[44]  A. Tsuchiyama,et al.  Compositional dependence of infrared absorption spectra of crystalline silicates - I. Mg–Fe pyroxenes , 2002 .

[45]  Atlanta,et al.  UvA-DARE ( Digital Academic Repository ) Crystalline silicate dust around evolved stars . III . A correlations study of crystalline silicate features , 2022 .

[46]  Atlanta,et al.  UvA-DARE ( Digital Academic Repository ) Crystalline silicate dust around evolved stars . II . The crystalline silicate complexes , 2022 .

[47]  J. Bouwman,et al.  ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: Towards an understanding of dust processing , 2000, astro-ph/0012295.

[48]  A. Castro-Carrizo,et al.  Mass, linear momentum and kinetic energy of bipolar flows in protoplanetary nebulae , 2001 .

[49]  J. Isern,et al.  The Chemical Composition of Carbon Stars. II. The J-Type Stars , 2000, astro-ph/0001144.

[50]  M. Jura,et al.  Orbiting Molecular Reservoirs around Evolved Red Giant Stars , 1999 .

[51]  C. Waelkens,et al.  Asymptotic Giant Branch Stars: IAU Symposium 191 , 1999 .

[52]  N. Mowlavi.  Dredge-Up in Asymptotic Giant Branch Stars , 1999 .

[53]  T. Evans.  Stars with Cool Dusty Disks , 1997 .

[54]  A. Tielens,et al.  Circumstellar Silicate Mineralogy , 1997 .

[55]  G. J. Matthews,et al.  Asymptotic-giant-branch stars , 1992, Nature.

[56]  H. Steenman,et al.  The anomalous extinction law , 1991 .

[57]  A. Omont,et al.  From Miras to planetary nebulae : which path for stellar evolution ? : Montpellier, France - September 4-7, 1989 , 1990 .

[58]  H. Steenman,et al.  The anomalous extinction law , 1989 .

[59]  J. Menzies,et al.  IRAS 20056+1834: A G star reflects on its past , 1988 .

[60]  Malcolm Coe.  The rhythm of Barro Colorado , 1983, Nature.

[61]  R. Kurucz.  Model atmospheres for G, F, A, B, and O stars , 1979 .

[62]  Blair D. Savage,et al.  Observed Properties of Interstellar Dust , 1979 .

[63]  K. Nordsieck,et al.  The Size distribution of interstellar grains , 1977 .

[64]  B. Piriou,et al.  Infrared Reflectivity and Raman Scattering of Mg2SiO4 Single Crystal , 1973 .