L1415-IRS爆发后的光谱
The Post-Outburst Spectrum of L1415-IRS
- California Institute of Technology（加州理工学院）
- Thüringer Landessternwarte Tautenburg（图林根州陶滕堡天文台）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究首次报道了经历30倍光度爆发的Class I型年轻恒星L1415-IRS的近红外光谱，发现其具有H2发射等特征，并推测其爆发强度不足以产生FU Ori型吸收谱，或已恢复为T Tauri型磁层吸积。
AI中文摘要：
我们展示了L1415-IRS的近红外光谱观测结果，这是一颗在21世纪初经历了超过30倍光度爆发的Class I型年轻恒星天体。我们是首个对这一深度嵌入源进行光谱观测的报告。L1415-IRS的两个组成部分均呈现出连续谱加H2发射。南部分量还额外具有较弱的HI Brγ和CO发射。基于我们的光谱以及光变曲线下降的证据，我们提出假设：要么是爆发规模不够大，因此温度不够高，无法产生通常被解释为吸积盘大气的FU Ori型吸收光谱；要么是该源已经从FU Ori型赤道吸积中恢复，重新建立了T Tauri型磁层吸积。
英文摘要：
We present near-infrared spectroscopic observations of L1415-IRS, a Class I type young stellar object that underwent a factor of $>$30 photometric outburst in the early 2000s. Ours is the first reported spectroscopy of this deeply embedded source. Both components of L1415-IRS present continuum plus $H_2$ emission. The southern component has additional weak HI Br$γ$ and $CO$ emission. Based upon our spectrum and evidence of a declining lightcurve, we hypothesize that either: the outburst was not large enough and therefore hot enough to produce the FU Ori type absorption spectrum commonly interpreted as an accretion disk atmosphere, or the source has already recovered from FU Ori-type equatorial accretion to re-establish T Tauri-type magnetospheric accretion.
