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Finding new sub-stellar co-moving companion candidates - the case of CT Cha

Published online by Cambridge University Press:  01 October 2007

Tobias Schmidt  and
Ralph Neuhäuser
Tobias Schmidt
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität Jena, Schillergäßchen 2-3, 07745 Jena, Germany email: tobi@astro.uni-jena.de
Ralph Neuhäuser
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität Jena, Schillergäßchen 2-3, 07745 Jena, Germany email: tobi@astro.uni-jena.de
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Abstract

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We have searched for close and faint companions around T Tauri stars in the Chamaeleon star forming region. Two epochs of direct imaging data were taken with the VLT Adaptive Optics instrument NaCo in February 2006 and March 2007 in Ks band for the classical T Tauri star CT Cha together with a Hipparcos binary for astrometric calibration. Moreover a J band image was taken in March 2007 to get color information. We found CT Cha to have a very faint companion (Ks0=14.6 mag) of ∼2.67” separation corresponding to ∼440AU. We show that CT Cha A and the faint object form a common proper motion pair and that the companion is not a non-moving background object (with 4σ significance).

Keywords

stars: planetary systemspre-main-sequenceimagingindividual: CT Cha
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 65 - 69
Copyright
Copyright © International Astronomical Union 2008

References

Batalha, C. C., Quast, G. R., Torres, C. A. O. et al. 1998, A&AS, 128, 561Google Scholar
Bertout, C., Robichon, N., Arenou, F. 1999, A&A, 352, 574Google Scholar
Brott, I. & Hauschildt, P. H. 2005, ESASP, 576, 565Google Scholar
Camargo, J. I. B., Ducourant, C., Teixeira, R. et al. 2003, A&A, 409, 361Google Scholar
Ducourant, C., Teixeira, R., Périé, J. P. et al. 2005, A&A, 438, 769Google Scholar
Feigelson, E. D., Casanova, S., Montmerle, T. et al. 1993, ApJ, 416, 623CrossRefGoogle Scholar
Gauvin, L. S., Strom, K. M. 1992, ApJ, 385, 217CrossRefGoogle Scholar
Ghez, A. M., McCarthy, D. W., Patience, J. L., & Beck, T. L. 1997, ApJ, 481, 378CrossRefGoogle Scholar
Glass, I. S. 1979, MNRAS, 187, 305CrossRefGoogle Scholar
Golimowski, D. A., Leggett, S. K., Marley, M. S. et al. 2004, AJ, 127, 3516CrossRefGoogle Scholar
Gregorio Hetem, J. C., Sanzovo, G. C., & Lepine, J. R. D. 1988, A&AS, 76, 347Google Scholar
Guenther, E. W., Esposito, M., & Mundt, R. 2007, A&A, 467, 1147Google Scholar
Hartmann, L., Calvet, N., Gullbring, E. et al. 1998, ApJ, 495, 385CrossRefGoogle Scholar
Henize, K. G. & Mendoza, V. E. E., 1973, ApJ, 180, 115CrossRefGoogle Scholar
Joergens, V. 2006, A&A, 448, 655Google Scholar
Kholopov, P. N., Samus, N. N., Kukarkina, N. P. et al. 1981, IBVS, 1921, 1Google Scholar
Lawson, W. A., Feigenlson, E. D., & Huenemoerder, D. P. 1996, MNRAS, 280, 1071Google Scholar
Lenzen, R., Hartung, M., Brandner, W. et al. 2003, SPIE, 4841, 944Google Scholar
Melo, C. H. F. 2003, A&A, 410, 269Google Scholar
Natta, A., Meyer, M. R., & Beckwith, S. V. W. 2000, ApJ, 534, 838CrossRefGoogle Scholar
Neuhäuser, R., Guenther, E. W., & Wuchterl, G. 2005, A&A, 435, L13Google Scholar
Rieke, G. H., & Lebofsky, M. J. 1985, ApJ, 288, 618CrossRefGoogle Scholar
Rousset, G., Lacombe, F., Puget, P. et al. 2003, SPIE, 4839, 140Google Scholar
Rydgren, A. E. 1980, AJ, 85, 444CrossRefGoogle Scholar
Schmidt, T. O. B., Neuhäuser, R., Seifahrt, A. et al. 2007/8, submitted to A&AGoogle Scholar
Stassun, K. G., Mathieu, R. D., & Valenti, J. A. 2006, Nature, 440, 311CrossRefGoogle Scholar
Weintraub, D. A. 1990, ApJS, 74, 575CrossRefGoogle Scholar
Whittet, D. C. B., Kirrane, T. M., Kilkenny, D. et al. 1987, MNRAS, 224, 497CrossRefGoogle Scholar
Whittet, D. C. B., Prusti, T., Franco, G. A. P. et al. 1997, A&A, 327, 1194Google Scholar
Zacharias, N., Urban, S. E., Zacharias, M. I. et al. 2004, AJ, 127, 3043CrossRefGoogle Scholar