论文标题
Akari/irc的近红外光谱中低亮度质体的冰特征
Ice features of low-luminosity protostars in near-infrared spectra of AKARI/IRC
论文作者
论文摘要
我们呈现了三种低亮度质体的近红外光谱和Perseus Molecular Cloud中的一个背景恒星，并使用红外摄像头（IRC）在板上获得\ textit {akari}空间望远镜。为了与不同的恒星形成环境进行比较，我们还提出了大规模的原始原始AFGL 7009s的光谱，在该光谱中，原恒星包膜得到了显着加热的，而低质量的Protostar rno 91，该91被怀疑正在经历偶发性爆发。我们分别在3.05、4.27和4.67 $ $ m的所有光谱上检测到\ ch {H2O}，\ ch {CO2}和\ ch {CO}的冰吸收特征。至少两个低亮度原始质体，我们还检测到\ ch {xcn}冰的特征，为4.62 $μ$ m。结晶\ ch {h2o}冰和\ ch {xcn}冰成分的存在表明，在过去的质量增生过程中，低亮度质体质体通过积聚爆发经历了热相。我们比较了低亮度的原始质体的冰丰度与嵌入的低质量原恒星和密集的分子云和核的冰丰度，这表明它们的冰丰度反映了先前爆发的强度以及最后一次爆发后的时间表。
We present near-infrared spectra of three low-luminosity protostars and one background star in the Perseus molecular cloud, acquired using the Infrared Camera (IRC) onboard the \textit{AKARI} space telescope. For the comparison with different star-forming environments, we also present spectra of the massive protostar AFGL 7009S, where the protostellar envelope is heated significantly, and the low-mass protostar RNO 91, which is suspected to be undergoing an episodic burst. We detected ice absorption features of \ch{H2O}, \ch{CO2}, and \ch{CO} at all spectra around the wavelengths of 3.05, 4.27, and 4.67 $μ$m, respectively. At least two low-luminosity protostars, we also detected the \ch{XCN} ice feature at 4.62 $μ$m. The presence of the crystalline \ch{H2O} ice and \ch{XCN} ice components indicates that the low-luminosity protostars experienced a hot phase via accretion bursts during the past mass accretion process. We compared the ice abundances of low-luminosity protostars with those of the embedded low-mass protostars and the dense molecular clouds and cores, suggesting that their ice abundances reflect the strength of prior bursts and the timescale after the last burst.
