Explosive nucleosynthesis in aspherical hypernova explosions and late-time spectra of SN 1998bw

被引：229

作者：

Maeda, K

Nakamura, T

Nomoto, K

Mazzali, PA

Patat, F

Hachisu, I

机构：

[1] Univ Tokyo, Dept Astron, Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, Sch Sci, Res Ctr Early Univ, Bunkyo Ku, Tokyo 1130033, Japan

[3] Osserv Astron Trieste, I-34131 Trieste, Italy

[4] European So Observ, D-85748 Garching, Germany

[5] Univ Tokyo, Coll Arts & Sci, Dept Earth Sci & Astron, Meguro Ku, Tokyo 1530041, Japan

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 565卷 / 01期

关键词：

gamma rays : bursts; line : profiles; nuclear reactions; nucleosynthesis; abundances supernovae : individual (SN 1998bw);

D O I：

10.1086/324487

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aspherical explosion models for the hypernova (hyperenergetic supernova) SN 1998bw are presented. Nucleosynthesis in aspherical explosions is examined with a two-dimensional hydrodynamical code and a detailed nuclear reaction network. Aspherical explosions lead to a strong alpha-rich freezeout, thus enhancing the abundance ratios [Ca-44, Ti-48, Zn-64/Fe] in the ejecta. The nebular line profiles of the Fe-dominated blend near 5200 Angstrom and of [O I] 6300, 6363 Angstrom are calculated and compared with the observed late-time spectra of SN 1998bw. Compared with the spherical model, the unusual features of the observed nebular spectra can be better explained if SN 1998bw is a strongly aspherical explosion with a kinetic energy of similar to10(5 2) ergs viewed from near the jet direction.

引用

页码：405 / 412

页数：8

共 28 条

[1]

AXELROD TS, 1980, THESIS L LIVERMORE N

[2]

Branch D, 2001, SPACE TEL S, V13, P96

[3] Monte Carlo simulations of supernova light curves and the hypernova SN 1998bw [J].

Chugai, NN .

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS, 2000, 26 (12) :797-801

[4] IMPLICATIONS OF CA-II EMISSION FOR PHYSICAL CONDITIONS IN THE BROAD-LINE REGION OF ACTIVE GALACTIC NUCLEI [J].

FERLAND, GJ ;

PERSSON, SE .

ASTROPHYSICAL JOURNAL, 1989, 347 (02) :656-673

[5] THE TYPE-IC SUPERNOVA 1994I IN M51 - DETECTION OF HELIUM AND SPECTRAL EVOLUTION [J].

FILIPPENKO, AV ;

BARTH, AJ ;

MATHESON, T ;

ARMUS, L ;

BROWN, M ;

ESPEY, BR ;

FAN, XM ;

GOODRICH, RW ;

HO, LC ;

JUNKKARINEN, VT ;

KOO, DC ;

LEHNERT, MD ;

MARTEL, AR ;

MAZZARELLA, JM ;

MILLER, JS ;

SMITH, GH ;

TYTLER, D ;

WIRTH, GD .

ASTROPHYSICAL JOURNAL, 1995, 450 (01) :L11-L15

[6] THE TYPE-IC (HELIUM-POOR IB) SUPERNOVA-1987M - TRANSITION TO THE SUPERNEBULAR PHASE [J].

FILIPPENKO, AV ;

PORTER, AC ;

SARGENT, WLW .

ASTRONOMICAL JOURNAL, 1990, 100 (05) :1575-&

[7] THE SEYFERT-1 OPTICAL-SPECTRA OF THE TYPE-II SUPERNOVAE 1987F AND 1988I [J].

FILIPPENKO, AV .

ASTRONOMICAL JOURNAL, 1989, 97 (03) :726-734

[8] An unusual supernova in the error box of the γ-ray burst of 25 April 1998 [J].

Galama, TJ ;

Vreeswijk, PM ;

van Paradijs, J ;

Kouveliotou, C ;

Augusteijn, T ;

Böhnhardt, H ;

Brewer, JP ;

Doublier, V ;

Gonzalez, JF ;

Leibundgut, B ;

Lidman, C ;

Hainaut, OR ;

Patat, F ;

Heise, J ;

in't Zand, J ;

Hurley, K ;

Groot, PJ ;

Strom, RG ;

Mazzali, PA ;

Iwamoto, K ;

Nomoto, K ;

Umeda, H ;

Nakamura, T ;

Young, TR ;

Suzuki, T ;

Shigeyama, T ;

Koshut, T ;

Kippen, M ;

Robinson, C ;

de Wildt, P ;

Wijers, RAMJ ;

Tanvir, N ;

Greiner, J ;

Pian, E ;

Palazzi, E ;

Frontera, F ;

Masetti, N ;

Nicastro, L ;

Feroci, M ;

Costa, E ;

Piro, L ;

Peterson, BA ;

Tinney, C ;

Boyle, B ;

Cannon, R ;

Stathakis, R ;

Sadler, E ;

Begam, MC ;

Ianna, P .

NATURE, 1998, 395 (6703) :670-672

[9] MIXING IN EJECTA OF SUPERNOVAE .1. GENERAL-PROPERTIES OF 2-DIMENSIONAL RAYLEIGH-TAYLOR INSTABILITIES AND MIXING WIDTH IN EJECTA OF SUPERNOVAE [J].

HACHISU, I ;

MATSUDA, T ;

NOMOTO, K ;

SHIGEYAMA, T .

ASTROPHYSICAL JOURNAL, 1992, 390 (01) :230-252

[10]

HACHISU I, 1994, ASTRON ASTROPHYS SUP, V104, P341

← 1 2 3 →