Details

Autor(en) / Beteiligte

• Milisavljevic, D
• Margotti, R
• Parrent, J T
• Soderberg, A M
• Fesen, R A
• Mazzali, P
• Maeda, K
• Sanders, N E
• Cenko, S B
• Silverman, J M

Titel

THE BROAD-LINED Type Ic SN 2012ap AND THE NATURE OF RELATIVISTIC SUPERNOVAE LACKING A GAMMA-RAY BURST DETECTION

Ist Teil von

• The Astrophysical journal, 2015-01, Vol.799 (1), p.1-14

Ort / Verlag

United States

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We present ultraviolet, optical, and near-infrared observations of SN 2012ap, a broad-lined Type Ic supernova in the galaxy NGC1729 that produced a relativistic and rapidly decelerating outflow without a gamma-ray burst signature. Photometry and spectroscopy follow the flux evolution from -13 to +272 days past the B-band maximum of -17.4 [+ or -] 0.5mag. The spectra are dominated by Fe II, OI, and Ca II absorption lines at ejecta velocities of v [approximate] 20,000 km s[sup -1] that change slowly over time. Other spectral absorption lines are consistent with contributions from photo-spheric He I, and hydrogen may also be present at higher velocities. SN 2012ap joins SN2009bb as another exceptional supernova that shows evidence for a central engine capable of launching a non-negligible portion of ejecta to relativistic velocities without a coincident gamma-ray burst detection. The events support the notion that jet activity at various energy scales may be present in a wide range of supernovae.