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The exceptionally luminous type II-linear supernova 2008es

Miller, AA and Chornock, R and Perley, DA and Ganeshalingam, M and Li, W and Butler, NR and Bloom, JS and Smith, N and Modjaz, M and Poznanski, D and Filippenko, AV and Griffith, CV and Shiode, JH and Silverman, JM (2009) The exceptionally luminous type II-linear supernova 2008es. The Astrophysical Journal, 690 (2). pp. 1303-1312. ISSN 1538-4357

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Abstract

We report on our early photometric and spectroscopic observations of the extremely luminous Type II supernova (SN) 2008es. SN 2008es, with an observed peak optical magnitude of mV = 17.8 and at a redshift z = 0.213, has a peak absolute magnitude of MV = -22.3, making it the second most luminous SN ever observed. The photometric evolution of SN 2008es exhibits a fast decline rate ( 0.042 mag d-1), similar to the extremely luminous Type II-Linear (II-L) SN 2005ap. We show that SN 2008es spectroscopically resembles the luminous Type II-L SN 1979C. Although the spectra of SN 2008es lack the narrow and intermediate-width line emission typically associated with the interaction of an SN with the circumstellar medium of its progenitor star, we argue that the extreme luminosity of SN 2008es is powered via strong interaction with a dense, optically thick circumstellar medium. The integrated bolometric luminosity of SN 2008es yields a total radiated energy at ultraviolet and optical wavelengths of ≳ 1051 erg. Finally, we examine the apparently anomalous rate at which the Texas Supernova Search has discovered rare kinds of SNe, including the five most luminous SNe observed to date, and find that their results are consistent with those of other modern SN searches. © 2009. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 23 May 2017 09:57
Last Modified: 23 May 2017 09:57
DOI or Identification number: 10.1088/0004-637X/690/2/1303
URI: http://researchonline.ljmu.ac.uk/id/eprint/6497

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