Still Brighter than Pre-explosion, SN 2012Z Did Not Disappear: Comparing Hubble Space Telescope Observations a Decade Apart
Still Brighter than Pre-explosion, SN 2012Z Did Not Disappear: Comparing Hubble Space Telescope Observations a Decade Apart
复制标题
SN 2012Z 仍然比爆炸前更亮,并没有消失:比较哈勃太空望远镜十年的观测结果
DOI:
10.3847/1538-4357/ac3bbd
复制
发表时间:
2021-06
期刊:
影响因子:
--
通讯作者:
Yssavo Camacho-Neves
中科院分区:
文献类型:
--
作者:
Curtis McCully;Saurabh W. Jha;Richard A. Scalzo;D. Andrew Howell;Ryan J. Foley;Yaotian Zeng;Zheng-Wei Liu;Griffin Hosseinzadeh;Lars Bildsten;Adam G. Riess;Robert P. Kirshner;G. H. Marion;Yssavo Camacho-Neves
Abstract. Type Iax supernovae (SNe Iax) represent the largest class of peculiar white dwarf supernovae. The type Iax SN 2012Z in NGC 1309 is the only white dwarf supernova with a detected progenitor system in pre-explosion observations. Deep Hubble Space Telescope (HST) images taken before SN 2012Z show a luminous, blue source that we have interpreted as a helium-star companion (donor) to the exploding white dwarf. We present here late-time HST observations taken ∼1400 days after the explosion to test this model. We find the SN light curve can empirically be fit by an exponential-decay model in magnitude units. The fitted asymptotic brightness is within 10% of our latest measurements and approximately twice the brightness of the pre-explosion source. The decline of the light curve is too slow to be powered by 56Co or 57Co decay: if radioactive decay is the dominate power source, it must be from longer half-life species like 55Fe. Interaction with circumstellar material may contribute to the light curve, as may shock heating of the companion star. Companion-star models underpredict the observed flux in the optical, producing most of their flux in the UV at these epochs. A radioactively heated bound remnant, left after only a partial disruption of the white dwarf, is also capable of producing the observed excess late-time flux. Our analysis suggests that the total ejecta + remnant mass is consistent with the Chandrasekhar mass for a range of SNe Iax.
登录
查看更多内容
DOI:
--
发表时间:
2012-06
期刊:
--
影响因子:
--
作者:
S. Gonzaga
通讯作者:
S. Gonzaga
影响因子:
2.8
作者:
通讯作者:
--
影响因子:
4.8
作者:
通讯作者:
--
影响因子:
3.7
作者:
通讯作者:
--
影响因子:
9.5
作者:
通讯作者:
--