Rise and fall of the dust shell of the classical nova V339 Delphini

A. Evans, D. P.K. Banerjee, R. D. Gehrz, V. Joshi, N. M. Ashok, V. A.R.M. Ribeiro, M. J. Darnley, C. E. Woodward, D. Sand, G. H. Marion, T. R. Diamond, S. P.S. Eyres, R. M. Wagner, L. A. Helton, S. Starrfield, D. P. Shenoy, J. Krautter, W. D. Vacca, M. T. Rushton

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Abstract

We present infrared spectroscopy of the classical nova V339 Del, obtained over an ∼2-yr period. The infrared emission lines were initially symmetrical, with half width half-maximum velocities of 525 km s−1. In later (t ≳ 77 d, 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 approximately day 34.75 at a condensation temperature of 1480 ± 20 K, consistent with graphitic carbon. Thereafter, the dust temperature declined with time as Td ∝ t−0.346, also consistent with graphitic carbon. The mass of dust initially rose, as a result of an increase in grain size and/or number, peaked at approximately 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. The appendix summarizes Planck means for carbon and the determination of grain mass and radius for a carbon dust shell.

Original languageEnglish
Pages (from-to)4221-4238
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume466
Issue number4
DOIs
Publication statusPublished - May 1 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Evans, A., Banerjee, D. P. K., Gehrz, R. D., Joshi, V., Ashok, N. M., Ribeiro, V. A. R. M., Darnley, M. J., Woodward, C. E., Sand, D., Marion, G. H., Diamond, T. R., Eyres, S. P. S., Wagner, R. M., Helton, L. A., Starrfield, S., Shenoy, D. P., Krautter, J., Vacca, W. D., & Rushton, M. T. (2017). Rise and fall of the dust shell of the classical nova V339 Delphini. Monthly Notices of the Royal Astronomical Society, 466(4), 4221-4238. https://doi.org/10.1093/mnras/stw3334