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arXiv 0804.4129astro-ph
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VLTI监测Nova V1280 Sco的尘埃形成事件

VLTI monitoring of the dust formation event of the Nova V1280 Sco

Olivier Chesneau, Dipankar Banerjee, F. Millour, N. Nardetto, A. Spang, S. Sacuto, M. Wittkowski, N. M. Ashok, R. K. Das, Ch. Hummel, S. Kraus, Eric Lagadec, S.… 展开作者

Olivier Chesneau, Dipankar Banerjee, F. Millour, N. Nardetto, A. Spang, S. Sacuto, M. Wittkowski, N. M. Ashok, R. K. Das, Ch. Hummel, S. Kraus, Eric Lagadec, S. Morel, M. Petr-Gotzens, F. T. Rantakyro, M. Schöller

摘要:

我们提出了第一个高空间分辨率的尘埃形成新星V1280斯科进行甚大望远镜干涉仪(VLTI)的监测。从尘埃形成的第23天开始到第145天,使用AMBER和EMBA仪器获得了光谱和光谱。这些干涉观测得到了来自1.2米Mt.阿布红外线天文台,印度。观测首先解释与简单的模型,但更复杂的模型,涉及第二壳,是必要的,以解释从t= 110天后,爆发获得的数据。这一行为与V1280 Sco的光变曲线一致,在t= 106 d附近出现第二个峰值,随后出现新的急剧下降,表明有新的尘埃形成事件。用DUSTY程序生成的球形尘埃壳模型也被用来研究主要尘埃壳的参数。使用均匀圆盘和高斯模型,这些观测使我们能够确定尘埃壳层的表观线性膨胀率为0.35 +/- 0.03质量/天,以及尘埃形成的物质喷射的近似时间为t_ejec=10.5+/-7d,即接近最大亮度。这一信息,结合500+/-100km/s的膨胀速度,意味着距离估计为1.6+/-0.4kpc。产生的尘埃质量通常为每天2-8 × 10^-9太阳质量。考虑到尘埃形成事件至少持续了200- 250天,喷出物质的质量很可能超过10^-4太阳质量。

英文摘要:

We present the first high spatial resolution monitoring of the dust forming nova V1280 Sco performed with the Very Large Telescope Interferometer (VLTI). Spectra and visibilities were obtained from the onset of the dust formation 23 days after discovery till day 145, using the instruments AMBER and MIDI. These interferometric observations are complemented by near-infrared data from the 1.2m Mt. Abu Infrared Observatory, India. The observations are first interpreted with simple models but more complex models, involving a second shell, are necessary to explain the data obtained from t=110d after outburst. This behavior is in accordance with the light curve of V1280 Sco which exhibits a secondary peak around t=106d, followed by a new steep decline, suggesting a new dust forming event. Spherical dust shell models generated with the DUSTY code are also used to investigate the parameters of the main dust shell. Using uniform disk and Gaussian models, these observations allow us to determine an apparent linear expansion rate for the dust shell of 0.35 +/- 0.03 mas/day and the approximate time of ejection of the matter in which dust formed as t_ejec=10.5+/-7d, i.e. close to the maximum brightness. This information, combined with the expansion velocity of 500+/-100km/s, implies a distance estimate of 1.6+/-0.4kpc. The dust mass generated was typically 2-8 10^-9 solar mass per day. Considering that the dust forming event lasted at least 200-250d, the mass of the ejected material is likely to have exceeded 10^-4 solar mass.

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