edge tracing
Recently Published Documents


TOTAL DOCUMENTS

43
(FIVE YEARS 5)

H-INDEX

7
(FIVE YEARS 1)

2020 ◽  
Vol 493 (2) ◽  
pp. 1761-1781 ◽  
Author(s):  
T M Reynolds ◽  
M Fraser ◽  
S Mattila ◽  
M Ergon ◽  
L Dessart ◽  
...  

ABSTRACT We present observations of the unusually luminous Type II supernova (SN) 2016gsd. With a peak absolute magnitude of V = −19.95 ± 0.08, this object is one of the brightest Type II SNe, and lies in the gap of magnitudes between the majority of Type II SNe and the superluminous SNe. Its light curve shows little evidence of the expected drop from the optically thick phase to the radioactively powered tail. The velocities derived from the absorption in H α are also unusually high with the blue edge tracing the fastest moving gas initially at 20 000 km s−1, and then declining approximately linearly to 15 000 km s−1 over ∼100 d. The dwarf host galaxy of the SN indicates a low-metallicity progenitor which may also contribute to the weakness of the metal lines in its spectra. We examine SN 2016gsd with reference to similarly luminous, linear Type II SNe such as SNe 1979C and 1998S, and discuss the interpretation of its observational characteristics. We compare the observations with a model produced by the jekyll code and find that a massive star with a depleted and inflated hydrogen envelope struggles to reproduce the high luminosity and extreme linearity of SN 2016gsd. Instead, we suggest that the influence of interaction between the SN ejecta and circumstellar material can explain the majority of the observed properties of the SN. The high velocities and strong H α absorption present throughout the evolution of the SN may imply a circumstellar medium configured in an asymmetric geometry.


Author(s):  
Xiaogang Zhu ◽  
Xiaotao Feng ◽  
Xiaozhu Meng ◽  
Sheng Wen ◽  
Seyit Camtepe ◽  
...  
Keyword(s):  

2018 ◽  
Vol 23 (11) ◽  
pp. 1
Author(s):  
Linbo Wang ◽  
Simin Li ◽  
Zhenglong Sun ◽  
Gang Wen ◽  
Fan Zheng ◽  
...  

Author(s):  
Xiaoqing Han ◽  
Xiaoqing Han ◽  
Yingjun Zhao ◽  
Yingjun Zhao ◽  
Kai Qing ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document