| Autor: |
L. Whitesides, R. Lunnan, M. M. Kasliwal, D. A. Perley, A. Corsi, S. B. Cenko, N. Blagorodnova, Y. Cao, D. O. Cook, G. B. Doran, D. D. Frederiks, C. Fremling, K. Hurley, E. Karamehmetoglu, S. R. Kulkarni, G. Leloudas, F. Masci, P. E. Nugent, A. Ritter, A. Rubin |
| Předmět: |
|
| Zdroj: |
Astrophysical Journal; 12/20/2017, Vol. 851 Issue 2, p1-1, 1p |
| Abstrakt: |
Wide-field surveys are discovering a growing number of rare transients whose physical origin is not yet well understood. Here we present optical and UV data and analysis of intermediate Palomar Transient Factory (iPTF) 16asu, a luminous, rapidly evolving, high-velocity, stripped-envelope supernova (SN). With a rest-frame rise time of just four days and a peak absolute magnitude of mag, the light curve of iPTF 16asu is faster and more luminous than that of previous rapid transients. The spectra of iPTF 16asu show a featureless blue continuum near peak that develops into an SN Ic-BL spectrum on the decline. We show that while the late-time light curve could plausibly be powered by 56Ni decay, the early emission requires a different energy source. Nondetections in the X-ray and radio strongly constrain the energy coupled to relativistic ejecta to be at most comparable to the class of low-luminosity gamma-ray bursts (GRBs). We suggest that the early emission may have been powered by either a rapidly spinning-down magnetar or by shock breakout in an extended envelope of a very energetic explosion. In either scenario a central engine is required, making iPTF 16asu an intriguing transition object between superluminous SNe, SNe Ic-BL, and low-luminosity GRBs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
