Статья

The Peculiar Type Ic Supernova 1997ef: Another Hypernova

Koichi IwamotoDepartment of Physics, College of Science and Technology, Nihon University, Chiyoda-ku, Tokyo 101-8308, JapanTakayoshi NakamuraDepartment of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanKen’ichi NomotoDepartment of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanP. A. MazzaliOsservatorio Astronomico di Trieste, via G. B. Tiepolo 11, I-34131 Trieste, ItalyI. J. DanzigerOsservatorio Astronomico di Trieste, via G. B. Tiepolo 11, I-34131 Trieste, ItalyP. GarnavichHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138R. KirshnerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Saurabh W. JhaHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138D. D. BalamUniversity of Victoria, Victoria, BC, CanadaJ. R. ThorstensenDartmouth College, Department of Physics and Astronomy, Hanover, NH 03755

2000en

ABI

Аннотация

SN 1997ef has been recognized as a peculiar supernova from its light curve and spectral properties. The object was classified as a Type Ic supernova (SN Ic) because its spectra are dominated by broad absorption lines of oxygen and iron, lacking any clear signs of hydrogen or helium line features. The light curve is very different from that of previously known SNe Ic, showing a very broad peak and a slow tail. The strikingly broad line features in the spectra of SN 1997ef, which were also seen in the hypernova SN 1998bw, suggest the interesting possibility that SN 1997ef may also be a hypernova. The light curve and spectra of SN 1997ef were modeled first with a standard SN Ic model assuming an ordinary kinetic energy of explosion EK = 10 51 erg. The explosion of a CO star of mass MCO ≈ 6M ⊙ gives a reasonably good fit to the light curve but clearly fails to reproduce the broad spectral features. Then, models with larger masses and energies were explored. Both the light curve and the spectra of SN 1997ef are much better reproduced by a C+O star model with EK = 8 × 1051 erg and MCO = 10M⊙.

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Идентификаторы

DOI: 10.1086/308761

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