AI 中文总结
重新审视 IIn 型超新星 SN 2015da 观测数据，通过分析 Hα 发射源位置变化等，结合热光度曲线、膨胀速度及星际相互作用建模，确定超新星爆炸能量、星际物质密度等，为研究该超新星现象提供新认识。
AI 中文摘要
对 IIn 型超新星 SN 2015da 的观测数据进行重新审视，以澄清这一现象的一些模糊问题。发现 Hα 发射源在第 90 天左右从星际物质切换到未受冲击的抛射物。此图像使得能够恢复晚期抛射物的膨胀速度，并确定尘埃在未受冲击抛射物内部区域的形成位置。热光度曲线和膨胀速度与星际相互作用建模相结合，表明超新星在质量约为 14M⊙的星际包层内以能量≥4×10⁵¹ erg 爆炸。恢复的星际物质密度与从 Hα 建模推断的汤姆逊光学深度一致。观测到的星际包层是由超新星爆炸前 400 年期间平均每年 0.035M⊙的质量损失率产生的。
英文摘要
Observational data on type IIn supernova SN 2015da are revisited to clarify some ambiguous issues of this phenomenon. The H alpha--emitting site is found to switch around day 90 from the circumstellar matter to the unshocked ejecta. This picture makes it possible to recover the expansion velocity of late time ejecta and to locate the dust formation in the inner zone of unshocked ejecta.The bolometric light curve and expansion velocities combined with modelling the circumstellar interaction imply that the supernova exploded with an energy of $\gtrsim 4\times10^{51}$ erg inside the circumstellar envelope with the mass of $\approx 14$ Msun. The recovered density of the circumstellar matter is consistent with the Thomson optical depth inferred from H alpha modelling on day 46.The observed circumstellar envelope is produced by an average mass loss rate of 0.035 Msun/yr during 400 yr before the supernova explosion.
CommentsAstronomy Letters, accepted
