论文标题
杂种He-Co白视术中钙矮人的破坏而产生的富含钙的超新星的起源
The origins of Calcium-rich supernovae from disruptions of CO white-dwarfs by hybrid He-CO white-dwarfs
论文作者
论文摘要
Calcium-rich (SN 2005E-like) explosions are very faint (typical -15.5, type I supernovae (SNe) showing strong Ca-lines, mostly observed in old stellar environments. Several models for such SNe had been explored and debated, but non were able to consistently reproduce the observed properties of Ca-rich SNe, nor their rates and host-galaxy distributions. Here we show that the disruptions of low-mass碳氧（CO）白色矮人（WDS）在合并期间通过杂种氦气（HECO）WDS解释了这种SNE的起源和特性。 its He-shell and eventually leads to its "weak" detonation and ejection and the production of a sub-energetic $\sim10^{49}$erg Ca-rich SN, while leaving the CO core of the HeCO-WD intact as a hot remnant white dwarf, possibly giving rise to X-ray emission as it cools down. We model the detailed light-curve and spectra of such explosions to find an excellent agreement with observations在这些模型中，ia/c富含Ca的SNE被燃烧，但较高的He-griphment水平也可能解释了IB Ca-Ca-rich SNE，从而为我们提供了一个可行的，可以使Ca-rich的原始范围造成了ca构成的培养基。 511源自$ {}^{44} \ textrm {ti} $衰减的星系中的kev信号。最后，这种sne的起源指向了heco wds作为sn祖细胞的关键角色，以及它们作为其他热核类型的祖细胞的潜在作用。
Calcium-rich (SN 2005E-like) explosions are very faint (typical -15.5, type I supernovae (SNe) showing strong Ca-lines, mostly observed in old stellar environments. Several models for such SNe had been explored and debated, but non were able to consistently reproduce the observed properties of Ca-rich SNe, nor their rates and host-galaxy distributions. Here we show that the disruptions of low-mass carbon-oxygen (CO) white dwarfs (WDs) by hybrid Helium-CO (HeCO) WDs during their merger could explain the origin and properties of such SNe. We make use of detailed multi-dimensional hydrodynamical-thermonuclear (FLASH) simulations models of HeCO-CO WD-WD mergers to characterize such explosions. We find that the accretion of CO material onto a HeCO-WD heats its He-shell and eventually leads to its "weak" detonation and ejection and the production of a sub-energetic $\sim10^{49}$erg Ca-rich SN, while leaving the CO core of the HeCO-WD intact as a hot remnant white dwarf, possibly giving rise to X-ray emission as it cools down. We model the detailed light-curve and spectra of such explosions to find an excellent agreement with observations of Ia/c Ca-rich SNe. In these models most of the He is burned, producing Ia/c Ca-rich SNe but higher He-enrichment levels might potentially also explain the Ib Ca-rich SNe. We thereby provide a viable, consistent model for the origins of Ca-rich. These findings can shed new light on the role of Ca-rich in the chemical evolution of galaxies and the intra-cluster medium, and their contribution to the observed 511 kev signal in the Galaxy originating from positrons produced from ${}^{44}\textrm{Ti}$ decay. Finally, the origins of such SNe points to the key-role of HeCO WDs as SN progenitors, and their potential role as progenitors of other thermonuclear SNe including normal type Ia SNe.
