The superluminous Type IIn supernova ASASSN-15ua: part of a continuum in extreme precursor mass-loss

被引:0
作者
Dickinson, Danielle [1 ,2 ]
Smith, Nathan [2 ]
Andrews, Jennifer E. [2 ,3 ]
Milne, Peter [2 ]
Kilpatrick, Charles D. [4 ,5 ]
Milisavljevic, Dan [6 ]
机构
[1] Purdue Univ, Dept Phys & Astron, 525 Northwestern Ave, W Lafayette, IN 47907 USA
[2] Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA
[3] Gemini Observ, NSFs NOIRLab, 670 N Aohoku Pl, Hilo, HI 96720 USA
[4] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astron CIERA, Evanston, IL 60208 USA
[5] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
[6] Purdue Univ, Integrat Data Sci Initiat, W Lafayette, IN 47907 USA
关键词
circumstellar matter; stars: evolution; supernovae: general; supernovae: individual: ASASSN-15ua; stars:; winds; outflows;
D O I
暂无
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a series of ground-based photometry and spectroscopy of the superluminous Type IIn supernova (SN) ASASSN-15ua, which shows evidence for strong interaction with pre-existing dense circumstellar material (CSM). Our observations constrain the speed, mass-loss rate, and extent of the progenitor wind shortly before explosion. A narrow P Cygni absorption component reveals a progenitor wind speed of similar to 100 km s(-1). As observed in previous SNe IIn, the intermediate-width H alpha emission became more asymmetric and blueshifted over time, suggesting either asymmetric CSM, an asymmetric explosion, or increasing selective extinction from dust within the post-shock shell or SN ejecta. Based on the CSM radius and speed, we find that the progenitor suffered extreme eruptive mass-loss with a rate of 0.1-1 M-circle dot yr(-1) during the similar to 12 yr immediately before the death of the star that imparted similar to 10(48) erg of kinetic energy to the CSM. Integrating its V-band light curve over the first 170 d after discovery, we find that ASASSN-15ua radiated at least 3 x 10(50) erg in visual light alone, giving a lower limit to the total radiated energy that may have approached 10(51) erg. ASASSN-15ua exhibits many similarities to two well-studied superluminous SNe IIn: SN 2006tf and SN 2010jl. Based on a detailed comparison of these three, we find that ASASSN-15ua falls in between these two events in a wide variety of observed properties and derived physical parameters, illustrating a continuum of behaviour across superluminous SNe IIn.
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收藏
页码:7767 / 7780
页数:14
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