Academic Journal
THE BROAD-LINED Type Ic SN 2012ap AND THE NATURE OF RELATIVISTIC SUPERNOVAE LACKING A GAMMA-RAY BURST DETECTION
| العنوان: | THE BROAD-LINED Type Ic SN 2012ap AND THE NATURE OF RELATIVISTIC SUPERNOVAE LACKING A GAMMA-RAY BURST DETECTION |
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| المؤلفون: | Milisavljevic, D., Margutti, R., Parrent, J. T., Soderberg, A. M., Fesen, R. A., Mazzali, P., Maeda, K., Sanders, N. E., Cenko, S. B., Silverman, J. M., Filippenko, A. V., Kamble, A., Chakraborti, S., Drout, M. R., Kirshner, R. P., Pickering, T. E., Kawabata, K., Hattori, T., Hsiao, Yi Chi Eric, Stritzinger, M. D., Marion, G. H., Vinko, J., Wheeler, J. C. |
| المصدر: | Milisavljevic , D , Margutti , R , Parrent , J T , Soderberg , A M , Fesen , R A , Mazzali , P , Maeda , K , Sanders , N E , Cenko , S B , Silverman , J M , Filippenko , A V , Kamble , A , Chakraborti , S , Drout , M R , Kirshner , R P , Pickering , T E , Kawabata , K , Hattori , T , Hsiao , Y C E , Stritzinger , M D , Marion , G H , Vinko .... |
| سنة النشر: | 2015 |
| المجموعة: | Aarhus University: Research |
| مصطلحات موضوعية: | gamma-ray burst: general, supernovae: general, supernovae: individual (SN 2012ap), CORE-COLLAPSE SUPERNOVAE, DIFFUSE INTERSTELLAR BANDS, SOUTHERN SPECTROPHOTOMETRIC STANDARDS, SWIFT ULTRAVIOLET/OPTICAL TELESCOPE, CASSIOPEIA-A SUPERNOVA, LATE-TIME SPECTRA, H-II REGIONS, STRIPPED-ENVELOPE, IB SUPERNOVAE, LIGHT CURVES |
| الوصف: | We present ultraviolet, optical, and near-infrared observations of SN 2012ap, a broad-lined Type Ic supernova in the galaxy NGC 1729 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 +/- 0.5mag. The spectra are dominated by Fe II, OI, and Ca II absorption lines at ejecta velocities of nu approximate to 20,000 km s(-1) that change slowly over time. Other spectral absorption lines are consistent with contributions from photospheric He I, and hydrogen may also be present at higher velocities (nu greater than or similar to 27,000 km s(-1)). We use these observations to estimate explosion properties and derive a total ejecta mass of similar to 2.7 M-circle dot, a kinetic energy of similar to 1.0 x 10(52) erg, and a Ni-56 mass of 0.1-0.2 M-circle dot. Nebular spectra (t > 200 days) exhibit an asymmetric double-peaked [O I] lambda lambda 6300, 6364 emission profile that we associate with absorption in the supernova interior, although toroidal ejecta geometry is an alternative explanation. SN 2012ap joins SN2009bb as another exceptional supernova that shows evidence for a central engine (e. g., black hole accretion or magnetar) capable of launching a non-negligible portion of ejecta to relativistic velocities without a coincident gamma-ray burst detection. Defining attributes of their progenitor systems may be related to notable observed properties including environmental metallicities of Z greater than or similar to Z(circle dot), moderate to high levels of host galaxy extinction (E(B - V) > 0.4mag), detection of high-velocity helium at early epochs, and a high relative flux ratio of [Ca II]/[O I] > 1 at nebular epochs. These events support the notion that jet activity at various energy scales may be present in a wide range of supernovae. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1088/0004-637X/799/1/51 |
| الاتاحة: | https://pure.au.dk/portal/en/publications/ab850e73-1e59-45c8-8fb0-1180e1494561 https://doi.org/10.1088/0004-637X/799/1/51 |
| Rights: | info:eu-repo/semantics/restrictedAccess |
| رقم الانضمام: | edsbas.F5D49269 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/0004-637X/799/1/51 |
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