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The morphology of the asteroidal dust around White Dwarf Stars : optical and near-infrared pulsations in G29-38
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(2024) The morphology of the asteroidal dust around White Dwarf Stars : optical and near-infrared pulsations in G29-38. The Astrophysical Journal, 963 (2). 113. doi:10.3847/1538-4357/ad1bd0 ISSN 1538-4357.
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Official URL: http://doi.org/10.3847/1538-4357/ad1bd0
Abstract
More than 36 yr have passed since the discovery of the infrared excess from circumstellar dust orbiting the white dwarf G29-38, which at 17.5 pc it is the nearest and brightest of its class. The precise morphology of the orbiting dust remains only marginally constrained by existing data, subject to model-dependent inferences, and thus fundamental questions of its dynamical origin and evolution persist. This study presents a means to constrain the geometric distribution of the emitting dust using stellar pulsations measured at optical wavelengths as a variable illumination source of the dust, which reradiates primarily in the infrared. By combining optical photometry from the Whole Earth Telescope with 0.7–2.5 μm spectroscopy obtained with SpeX at NASA’s Infrared Telescope Facility, we detect luminosity variations at all observed wavelengths, with variations at most wavelengths corresponding to the behavior of the pulsating stellar photosphere, but toward the longest wavelengths the light curves probe the corresponding time variability of the circumstellar dust. In addition to developing methodology, we find the pulsation amplitudes decrease with increasing wavelength for principal pulsation modes, yet increase beyond ≈2 μm for nonlinear combination frequencies. We interpret these results as combination modes derived from the principal modes of identical ℓ values and discuss the implications for the morphology of the warm dust. We also draw attention to some discrepancies between our findings and theoretical expectations for the results of the nonlinearity imposed by the surface convection zone on mode–mode interactions and on the behavior of the first harmonic of the highest-amplitude pulsation mode.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
SWORD Depositor: | Library Publications Router | ||||
Journal or Publication Title: | The Astrophysical Journal | ||||
Publisher: | The American Astronomical Society | ||||
ISSN: | 1538-4357 | ||||
Official Date: | 5 March 2024 | ||||
Dates: |
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Volume: | 963 | ||||
Number: | 2 | ||||
Article Number: | 113 | ||||
DOI: | 10.3847/1538-4357/ad1bd0 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Re-use Statement: | ** From IOP Publishing via Jisc Publications Router ** History: received 05-11-2023; rev-recd 29-12-2023; accepted 04-01-2024; oa-requested 04-01-2024; ppub 01-03-2024; epub 05-03-2024; open-access 05-03-2024. ** Licence for this article: http://creativecommons.org/licenses/by/4.0/ | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Date of first compliant deposit: | 15 May 2024 | ||||
Date of first compliant Open Access: | 15 May 2024 | ||||
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