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

• Verfasst von: Evans, Aneurin [VerfasserIn]
• Verfasst von: Krautter, Joachim [VerfasserIn]
• Titel: Rise and fall of the dust shell of the classical nova V339 Delphini
• Verf.angabe: 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 and M.T. Rushton
• E-Jahr: 2017
• Jahr: 2017 January 13
• Umfang: 18 S.
• Fussnoten: Gesehen am 11.10.2017
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2017
• Band/Heft Quelle: 466(2017), 4, Seite 4221-4238
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stw3334
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564290417

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.