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Adaptive Optics Imaging of Circumstellar Environments

  • Dániel Apai (a1), Ilaria Pascucci (a1), Hongchi Wang (a1), Wolfgang Brandner (a1), Thomas Henning (a1), Carol Grady (a2) and Dan Potter (a3)...

Abstract

We present results from our high-resolution, high-contrast imaging campaign targeting the circumstellar environments of young, nearby stars of different masses. The observations have been conducted using the ALFA/CA 3.5m and NACO UT4/VLT adaptive optics systems. In order to enhance the contrast we applied the methods PSF-subtraction and polarimetric differential imaging (PDI). The observations of young stars yielded the identification of numerous new companion candidates, the most interesting one being ∼ 0.5″ from FU Ori. We also obtained high-resolution near-infrared imaging of the circumstellar envelope of SU Aur and AB Aur. Our PDI of the TW Hya circumstellar disk traced back the disk emission as close as 0.1″ ≃ 6 AU from the star, the closest yet. Our results demonstrate the potential of the adaptive optics systems in achieving high-resolution and high-contrast imaging and thus in the study of circumstellar disks, envelopes and companions.

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References

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Apai, D., Pascucci, I., Brandner, W., Henning, Th., Lenzen, R., Potter, D., Lagrange, A.-M., & Rousset, G. 2003 A&A, submitted
Huélamo, N. & Brandner, W. 2003 in preparation
Krist, J. E., Stapelfeldt, K. R., Menard, F., Padgett, D. L., & Burrows, C. J. 2000 ApJ, 538, 793
Kuhn, J. R., Potter, D., & Praise, B. 2001 ApJ, 553, 189
Grady, C., Stapelfeldt, K., Clampin, M., Padgett, D., Woodgate, B., Henning, Th., Grinin, V., Quirrenbach, A., Stecklum, B., Sitko, M., & Biggs, J. 2001 AAS, 199, 60.15
Grady, C. et al. 2003, in preparation
Wang, H., Apai, D., Henning, Th., Pascucci, I., & Leinert, Ch. 2003 ApJ, in preparation
Weinberger, A. J., Becklin, E. E., Schneider, G., Chiang, E. I., Lowrance, P. J., Silverstone, M., Zuckerman, B., Hines, D. C., & Smith, B. A. 2002 ApJ, 566, 409

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