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arXiv 1207.5301astro-ph.SR
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新星V1280 Sco周围的膨胀尘埃双极星云

The expanding dusty bipolar nebula around the nova V1280 Sco

Olivier Chesneau, E. Lagadec, M. Otulakowska-Hypka, D. P. K. Banerjee, C. E. Woodward, E. Harvey, A. Spang, P. Kervella, F. Millour, N. Nardetto, N. M. Ashok, M… 展开作者

Olivier Chesneau, E. Lagadec, M. Otulakowska-Hypka, D. P. K. Banerjee, C. E. Woodward, E. Harvey, A. Spang, P. Kervella, F. Millour, N. Nardetto, N. M. Ashok, M. J. Barlow, M. F. Bode, A. Evans, D. K. Lynch, T. J. O'Brien, R. J. Rudy, R. W. Russell

摘要:

V1280 Sco是有史以来观测到的尘埃形成最慢的新星之一。我们对V1280 Sco的星周尘埃环境进行了多历元高空间分辨率观测,以调查喷出物的不对称程度。我们在2009年,2010年和2011年使用前所未有的高角分辨率技术观测了V1280 Sco。我们在J、H和K波段使用了NACO/VLT自适应光学系统,同时使用了解析V1280 Sco尘埃包层的VISIR/VLT中红外成像,以及2011年获得的SINFONI/VLT观测数据。我们报告发现了一个满是灰尘的沙漏状双极星云。星云的表观大小从2009年7月的0.30 "x 0.17"增加到2011年7月的0.64 "x 0.42"。纵横比表明,源是在高倾角。中心源在K波段有效发光,占2009年总通量的56 +/-5%,2011年占87 +/-6%。从VISIR观测结果中推断出长轴方向的平均膨胀率为每天0.39 +/-0.03质量,这代表了预计的上限。假设尘埃壳在该方向上的膨胀速度与光谱学中检测到的低激发慢喷出物一样快,这产生了到V1280 Sco的1kpc的下限距离;然而,由于尘埃喷出物的复杂形状和速度场,系统误差仍然很大。尘埃似乎主要存在于极冠中,在最新的数据集中,在赤道地区没有检测到红外通量。这可能意味着质量损失主要是极性的。

英文摘要:

V1280 Sco is one of the slowest dust-forming nova ever historically observed. We performed multi-epoch high-spatial resolution observations of the circumstellar dusty environment of V1280 Sco to investigate the level of asymmetry of the ejecta We observed V1280 Sco in 2009, 2010 and 2011 using unprecedented high angular resolution techniques. We used the NACO/VLT adaptive optics system in the J, H and K bands, together with contemporaneous VISIR/VLT mid-IR imaging that resolved the dust envelope of V1280 Sco, and SINFONI/VLT observations secured in 2011. We report the discovery of a dusty hourglass-shaped bipolar nebula. The apparent size of the nebula increased from 0.30" x 0.17" in July 2009 to 0.64" x 0.42" in July 2011. The aspect ratio suggests that the source is seen at high inclination. The central source shines efficiently in the K band and represents more than 56+/-5% of the total flux in 2009, and 87+/-6% in 2011. A mean expansion rate of 0.39+/-0.03 mas per day is inferred from the VISIR observations in the direction of the major axis, which represents a projected upper limit. Assuming that the dust shell expands in that direction as fast as the low-excitation slow ejecta detected in spectroscopy, this yields a lower limit distance to V1280 Sco of 1kpc; however, the systematic errors remain large due to the complex shape and velocity field of the dusty ejecta. The dust seems to reside essentially in the polar caps and no infrared flux is detected in the equatorial regions in the latest dataset. This may imply that the mass-loss was dominantly polar.

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