标题： 限制V838 南船座遗迹的恒星周围环境的物理结构 显示英文标题

标题： Constraining the physical structure of the circumstellar environment of V838 Monocerotis remnant

摘要： 船帆座V838（V838 Mon）在2002年爆发为一颗亮红新星，之后冷却并开始形成尘埃。 残骸预计会成为蓝离散星。 在HKLM波段的干涉观测揭示了残骸恒星最近区域内的一个稳定双极特征。 我们的目标是限制V838 Mon周围星际物质的物理结构和性质。 利用辐射转移代码RADMC3D，我们成功地约束了能最好代表最近VLTI和CHARA干涉成像实验的尘埃密度分布。 我们还展示了最近的SAAO-HIPPO偏振测量数据，这些数据进一步测试了尘埃分布模型。 我们发现一个多分量模型，包括喷流、环状结构和椭球体，能够很好地拟合H波段干涉观测数据，然而，它难以再现K波段的极小闭合相位偏差。 在我们的模型中，喷流对于产生非零闭合相位至关重要，因为它们有助于在环状结构中产生不对称性。 偏振测量显示目前固有线性偏振非常低，偏振度<2%，与我们的模型一致。 尽管不是独一无二的，但我们的尘埃模型表明残骸中存在持久的环状结构和喷流，这与一些关于中等质量合并产物的预测相符。 然而，即使这些特征可能是V838 Mon演化为蓝离散星阶段的重要标志，但这些特征的起源仍然很大程度上不清楚。 显示英文摘要

摘要： V838 Monocerotis (V838 Mon) erupted in 2002 as a luminous red nova after which it cooled and began to form dust. The remnant is predicted to become a blue straggler. Interferometric observations in the HKLM bands have uncovered a stable bipolar feature in the closest vicinity of the remnant star. We aim to constrain the physical structure and nature of the circumstellar material immediately surrounding V838 Mon. Using the radiative-transfer code RADMC3D we managed to constrain the dust density distribution that best represents recent VLTI and CHARA interferometric imaging experiments. We also present recent SAAO-HIPPO polarimetric measurements which further test dust distribution models. We find that a multi-component model consisting of jets, a torus, and an ellipsoid provides an adequate fit to H band interferometric observables, however, it struggles to reproduce the extremely small closure phase deviations in the K band. The jets in our model are vital to produce nonzero closure phases, as they help to produce a gap in the torus, which is the sole source of asymmetry. The polarimetric measurements show that the intrinsic linear polarization is currently very low, with degree of polarization < 2%, consistent with our model. Although not unique, our dust model suggests a persistent torus-like structure and jet or jets in the remnant, in agreement with several predictions for an intermediate-mass merger product. However, even though these features may be important signposts of the evolution of V838 Mon to the blue straggler phase, the origin of these features, remains largely unclear.