Evans, A, Banerjee, DPK, Gehrz, RD, Joshi, V, Ashok, NM, Ribeiro, VARM, Darnley, MJ, Woodward, CE, Sand, D, Marion, GH, Diamond, TR, Eyres, SPS, Wagner, RM, Helton, LA, Starrfield, S, Shenoy, DP, Krautter, J, Vacca, WD and Rushton, MT (2017) Rise and fall of the dust shell of the classical nova V339 Delphini. Monthly Notices of the Royal Astronomical Society, 466 (4). pp. 4221-4238. ISSN 1365-2966

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Abstract

We present infrared spectroscopy of the classical nova V339 Delphini, obtained over a $\sim2$ year period. The infrared emission lines were initially symmetrical, with HWHM velocities of 525 km s$^{-1}$. In later ($t\gtrsim77$days, where $t$ is the time from outburst) spectra however, the lines displayed a distinct asymmetry, with a much stronger blue wing, possibly due to obscuration of the receding component by dust. Dust formation commenced at $\sim$ day 34.75 at a condensation temperature of $1480\pm20$K, consistent with graphitic carbon. Thereafter the dust temperature declined with time as $T_{\rm d}\propto{t}^{-0.346}$, also consistent with graphitic carbon. The mass of dust initally rose, as a result of an increase in grain size and/or number, peaked at $\sim$ day 100, and then declined precipitously. This decline was most likely caused by grain shattering due to electrostatic stress after the dust was exposed to X-radiation. An Appendix summarises Planck Means for carbon, and the determination of grain mass and radius for a carbon dust shell.

Item Type: Article
Additional Information: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Uncontrolled Keywords: line:profiles; circumstellar matter; stars:individual:V339 Del; novae; cataclysmic variables; infrared:stars
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB799 Stars
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Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 21 Mar 2017 15:55
Last Modified: 21 Mar 2017 15:55
URI: http://eprints.keele.ac.uk/id/eprint/3043

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