The mineral composition and spatial distribution of the dust
 ejecta of NGC 6302

Kemper, F.; Molster, F. J.; Jäger, Cornelia; Waters, L.B.F.M.

doi:10.1051/0004-6361:20021119

Cited by 49 publications

(74 citation statements)

References 45 publications

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“…Others are red giants, for example HD 233517, an evolved O-rich red giant with PAHs in a circumstellar disc (Jura et al 2006). Other examples are planetary nebulae (PNe) with evidence of silicates and PAHs (Kemper et al 2002;Gutenkunst et al 2008), or the hydrogen-poor [WC] central stars of PNe Article published by EDP Sciences Note: Listed are the name, equatorial coordinates α and δ(J2000), effective temperature T eff , surface gravity log g, and metallicity [Fe/H] of our sample stars. For the model parameters we refer to De Ruyter et al (2006).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the infrared spectra of the peculiar post-AGB stars EP Lyrae and HD 52961

Gielen¹,

Winckel²,

Matsuura

et al. 2009

A&A

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Aims. We aim to study in detail the peculiar mineralogy and structure of the circumstellar environment of two binary post-AGB stars, EP Lyr and HD 52961. Both stars were selected from a larger sample of evolved disc sources observed with Spitzer and show unique solid-state and gas features in their infrared spectra. Moreover, they show a very small infrared excess in comparison with the other sample stars. Methods. The different dust and gas species are identified on the basis of high-resolution Spitzer-IRS spectra. We fit the full spectrum to constrain grain sizes and temperature distributions in the discs. This, combined with our broad-band spectral energy distribution and interferometric measurements, allows us to study the physical structure of the disc, using a self-consistent 2D radiative-transfer disc model. Results. We find that both stars have strong emission features due to CO 2 gas, dominated by 12 C 16 O 2 , but with clear 13 C 16 O 2 and even 16 O 12 C 18 O isotopic signatures. Crystalline silicates are apparent in both sources but proved very hard to model. EP Lyr also shows evidence of mixed chemistry, with emission features of the rare class-C PAHs. Whether these PAHs reside in the oxygen-rich disc or in a carbon-rich outflow is still unclear. With the strongly processed silicates, the mixed chemistry and the low 12 C/ 13 C ratio, EP Lyr resembles some silicate J-type stars, although the depleted photosphere makes nucleosynthetic signatures difficult to probe. We find that the disc environment of both sources is, to a first approximation, well modelled with a passive disc, but additional physics such as grain settling, radial dust distributions, and an outflow component must be included to explain the details of the observed spectral energy distributions in both stars.

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Section: Introductionmentioning

confidence: 99%

Analysis of the infrared spectra of the peculiar post-AGB stars EP Lyrae and HD 52961

Gielen¹,

Winckel²,

Matsuura

et al. 2009

A&A

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“…4) To end, a broad emission feature is found at 100 µm in the Carina Nebula and Sh 171, possibly due to carbon onion grains . A similar broad feature around 90 µm is reported in evolved stars and a low mass protostar, attributed to calcite, a Cabearing carbonate mineral (Ceccarelli et al, 2002;Kemper et al, 2002).…”

Section: Pahs and Dustsupporting

confidence: 75%

High Excitation ISM and Gas

et al.

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“…Of the elements seen thus far in spectroscopic observations of SDSS J1043+0855, we could construct the following naturally occurring carbonates (on Earth): CaCO 3 , MgCO 3 , and FeCO 3 . CaCO 3 in particular has already been seen in various space environments (e.g., Kemper et al 2002b;Kemper et al 2002a;Chiavassa et al 2005;Boynton et al 2009;de Sanctis et al 2016), and thus is a reasonable candidate for also being present in the material being accreted by SDSS J1043+0855.…”

Section: Discussionmentioning

confidence: 97%

Does a Differentiated, Carbonate-Rich, Rocky Object Pollute the White Dwarf SDSS J104341.53+085558.2?

Melis

Dufour

2016

ApJ

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We present spectroscopic observations of the dust-and gas-enshrouded, polluted, single white dwarf star SDSS J104341.53+085558.2 (hereafter SDSS J1043+0855). Hubble Space T elescope Cosmic Origins Spectrograph far-ultraviolet spectra combined with deep Keck HIRES optical spectroscopy reveal the elements C, O, Mg, Al, Si, P, S, Ca, Fe, and Ni and enable useful limits for Sc, Ti, V, Cr, and Mn in the photosphere of SDSS J1043+0855. From this suite of elements we determine that the parent body being accreted by SDSS J1043+0855 is similar to the silicate Moon or the outer layers of Earth in that it is rocky and iron-poor. Combining this with comparison to other heavily polluted white dwarf stars, we are able to identify the material being accreted by SDSS J1043+0855 as likely to have come from the outermost layers of a differentiated object. Furthermore, we present evidence that some polluted white dwarfs (including SDSS J1043+0855) allow us to examine the structure of differentiated extrasolar rocky bodies. Enhanced levels of carbon in the body polluting SDSS J1043+0855 relative to the Earth-Moon system can be explained with a model where a significant amount of the accreted rocky minerals took the form of carbonates; specifically, through this model the accreted material could be up to 9% calcium-carbonate by mass.

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The mineral composition and spatial distribution of the dust ejecta of NGC 6302

Cited by 49 publications

References 45 publications

Analysis of the infrared spectra of the peculiar post-AGB stars EP Lyrae and HD 52961

Analysis of the infrared spectra of the peculiar post-AGB stars EP Lyrae and HD 52961

High Excitation ISM and Gas

Does a Differentiated, Carbonate-Rich, Rocky Object Pollute the White Dwarf SDSS J104341.53+085558.2?

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