Optical and infrared photometry of the Type IIn SN 1998S: days 11–146期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Optical and infrared photometry of the Type IIn SN 1998S: days 11–146

Authors:	A Fassia W P S Meikle W D Vacca S N Kemp N A Walton D L Pollacco S Smartt A Oscoz A Aragón-Salamanca S Bennett T G Hawarden A Alonso D Alcalde A Pedrosa J Telting M J Arevalo H J Deeg F Garzón A Gómez-Roldán G Gómez C Gutiérrez S López M Rozas M Serra-Ricart M R Zapatero-Osorio

Institution:	Astrophysics Group, Blackett Laboratory, Imperial College, Prince Consort Rd, London SW7 2BZ;Institute for Astronomy, 2680 Woodlawn Dr., Honolulu, HI 96822, USA;Instituto de Astronomia y Meteorologia, Av. Vallarta 2602, Col. Arcos Vallarta, CP 44130, Guadalajara, Jalisco, Mexico;Royal Greenwich Observatory, Apartado de Correos 321, 38780 Santa Cruz de La Palma, Tenerife, Islas Canarias, Spain;Astrophysics and Planetary Sciences Division, The Queen's University of Belfast, Belfast BT7 1NN;Instituto de Astrofísica de Canarias, C/ Via Lactea S/N, E-38200 La Laguna, Tenerife, Spain;School of Physics &Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD;Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;Joint Astronomy Centre, 660 N. A'Ohoku Place, University Park, Hilo, HI 96720, USA;Centro de Astrofísica da Universidade do Porto, Portugal;Isaac Newton Group of Telescopes, NWO (Netherlands Organisation for Scientific Research), Apartado 321, 38700 Santa Cruz de La Palma, Spain

Abstract:	We present contemporaneous optical and infrared (IR) photometric observations of the Type IIn SN 1998S covering the period between 11 and 146 d after discovery. The IR data constitute the first ever IR light curves of a Type IIn supernova. We use blackbody and spline fits to the photometry to examine the luminosity evolution. During the first 2–3 months, the luminosity is dominated by the release of shock-deposited energy in the ejecta. After ∼100 d the luminosity is powered mostly by the deposition of radioactive decay energy from 0.15±0.05 M_⊙ of ⁵⁶Ni which was produced in the explosion. We also report the discovery of an astonishingly high IR excess, K − L '=2.5, that was present at day 130. We interpret this as being due to thermal emission from dust grains in the vicinity of the supernova. We argue that to produce such a high IR luminosity so soon after the explosion, the dust must be pre-existing and so is located in the circumstellar medium of the progenitor. The dust could be heated either by the UV/optical flash (IR echo) or by the X-rays from the interaction of the ejecta with the circumstellar material.

Keywords:	circumstellar matter supernovae: individual: SN 19985 infrared: stars

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