The dust disk and companion of the nearby AGB star L2 Puppis SPHERE/ZIMPOL polarimetric imaging at visible wavelengths

被引:46
作者
Kervella, P. [1 ,2 ,3 ]
Montarges, M. [3 ,4 ]
Lagadec, E. [5 ]
Ridgway, S. T. [6 ]
Haubois, X. [7 ]
Girard, J. H. [7 ]
Ohnaka, K. [8 ]
Perrin, G. [3 ]
Gallenne, A. [9 ]
机构
[1] INSU, CNRS, Unidad Mixta Internac Franco Chilena Astron UMI 3, Paris, France
[2] Univ Chile, Dept Astron, Santiago, Chile
[3] Univ Paris Diderot, PSL Res Univ, LESIA UMR 8109, Observ Paris,CNRS, F-92195 Meudon, France
[4] Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France
[5] Univ Nice Sophia Antipolis, Lab Lagrange UMR 7293, CNRS, Observ Cote Azur, F-06304 Nice 4, France
[6] Natl Opt Astron Observ, Tucson, AZ 85719 USA
[7] European So Observ, Santiago 19, Chile
[8] Univ Catolica Norte, Inst Astron, Antofagasta, Chile
[9] Univ Concepcion, Dept Astron, Concepcion, Chile
来源
ASTRONOMY & ASTROPHYSICS | 2015年 / 578卷
关键词
stars: individual: HD 56096; stars: imaging; circumstellar matter; techniques: high angular resolution; techniques: polarimetric; stars: AGB and post-AGB; MASS-LOSS; GEOMETRIC DISTANCE; LIGHT-SCATTERING; INNER WIND; EMISSION; ENVELOPE; GRAINS; CURVE;
D O I
10.1051/0004-6361/201526194
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The bright southern star L-2 Pup is a particularly prominent asymptotic giant branch (AGB) star, located at a distance of only 64 pc. We report new adaptive optics observations of L2 Pup at visible wavelengths with the SPHERE/ZIMPOL instrument of the VLT that confirm the presence of the circumstellar dust disk discovered recently. This disk is seen almost almost edge-on at an inclination of 82 degrees. The signature of its three-dimensional structure is clearly observed in the map of the degree of linear polarization p(L). We identify the inner rim of the disk through its polarimetric signature at a radius of 6AU from the AGB star. The ZIMPOL intensity images in the V and R bands also reveal a close-in secondary source at a projected separation of 2AU from the primary. Identification of the spectral type of this companion is uncertain due to the strong reddening from the disk, but its photometry suggests that it is a late K giant with comparable mass to the AGB star. We present refined physical parameters for the dust disk derived using the RADMC-3D radiative transfer code. We also interpret the p(L) map using a simple polarization model to infer the three-dimensional structure of the envelope. Interactions between the inner binary system and the disk apparently form spiral structures that propagate along the orthogonal axis to the disk to form streamers. Two dust plumes propagating orthogonally to the disk are also detected. They originate in the inner stellar system and are possibly related to the interaction of the wind of the two stars with the material in the disk. Based on the morphology of the envelope of L-2 Pup, we propose that this star is at an early stage in the formation of a bipolar planetary nebula.
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页数:12
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