Eleonora Bianchi, Ana López-Sepulcre, Cecilia Ceccarelli, Claudio Codella, Linda Podio, Mathilde Bouvier, Joan Enrique-Romero, Rafael Bachiller and Bertrand Lefloch
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引用次数: 0
摘要
我们报道了阿塔卡马大型毫米/亚毫米阵列(ALMA)对双星系统SVS13-A的高角分辨率(~ 50 au)观测。更具体地说，我们分析了氘化水(HDO)和二氧化硫(SO2)排放。分子发射与双星系统的两个组成部分VLA4A和VLA4B有关。将其空间分布与之前在系统中分析的甲酰胺(NH2CHO)进行了比较。氘化水在距离原恒星≥120au的地方，在蓝移速度处(距离系统速度3 km s−1)，显示出与尘埃吸积流线在空间上一致的附加发射成分。我们利用更新的结合能(BE)分布计算热升华温度，研究了流光中分子发射的起源。我们提出观测到的发射是由吸积流线和VLA4A盘之间的吸积激波产生的。热解吸不完全排除在情况下，源正在积极经历一个吸积爆发。
Streamers feeding the SVS13-A protobinary system: astrochemistry reveals accretion shocks?
We report Atacama Large Millimeter/submillimeter Array (ALMA) high-angular resolution (∼50 au) observations of the binary system SVS13-A. More specifically, we analyse deuterated water (HDO) and sulfur dioxide (SO2) emission. The molecular emission is associated with both the components of the binary system, VLA4A and VLA4B. The spatial distribution is compared to that of formamide (NH2CHO), previously analysed in the system. Deuterated water shows an additional emitting component spatially coincident with the dust-accretion streamer, at a distance ≥120 au from the protostars, and at blue-shifted velocities (>3 km s−1 from the systemic velocities). We investigate the origin of the molecular emission in the streamer, in light of thermal sublimation temperatures calculated using updated binding energy (BE) distributions. We propose that the observed emission is produced by an accretion shock at the interface between the accretion streamer and the disk of VLA4A. Thermal desorption is not completely excluded in case the source is actively experiencing an accretion burst.
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