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Ground-based exoplanet near-infrared search by imaging and spectroscopy: 3 new companion candidates in TWA

Published online by Cambridge University Press:  26 May 2016

Ralph Neuhäuser
Affiliation:
MPI extraterrestrische Physik, D-85741 Garching, Germany, and University of Hawaii, Institute for Astronomy, Honolulu, USA
Nuria Huélamo
Affiliation:
MPI extraterrestrische Physik, D-85741 Garching, Germany
Eike W. Guenther
Affiliation:
Thüringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany
Wolfgang Brandner
Affiliation:
European Southern Observatory, D-85748 Garching, Germany
João Alves
Affiliation:
European Southern Observatory, D-85748 Garching, Germany
Fernando Comerón
Affiliation:
European Southern Observatory, D-85748 Garching, Germany
Monika G. Petr
Affiliation:
MPI für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
Jean-Gabriel Cuby
Affiliation:
European Southern Observatory, Santiago, Chile

Abstract

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We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 100 pc) stars, where companions should be well separated from the central stars and still relatively bright due to ongoing accretion and/or contraction. Our observations are performed mainly with SOFI and SHARP at the ESO 3.5m NTT on La Silla (imaging) and with ISAAC at the ESO 8.2m Antu (VLT-UT1) on Cerro Paranal (imaging and spectroscopy), all in the H- and K-bands. Here, we present new companion candidates1 around three T Tauri stars (TWA-8 A, RXJ1121.1-3845, and RXJ1121.3-3447 N) in the TW Hya group, which would have been sub-stellar if at the same distance and age as the T Tauri stars, but are found to be background stars by spectroscopy.

Type
Part V: Discovery and study of extrasolar planets - future
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Guenther, E.W., Neuhäuser, R., Brandner, W., et al. 2001, A&A, 365, 514.Google Scholar
Neuhäuser, R., Brandner, W., Eckart, A., et al. 2000a, A&A, 354, L9.Google Scholar
Neuhäuser, R., Guenther, E.W., Petr, M.G., et al. 2000b, A&A, 360, L39.Google Scholar
Neuhäuser, R., Guenther, E.W., Brandner, W., et al. 2001, in ASP Conf. Ser., From darkness to light, ed. Mont merle, T. & Andre, P., in press.Google Scholar
Schneider, G., Lowrance, P.J., Becklin, E.E., et al. 2001, in Lecture Notes in Physics, Springer, in press.Google Scholar
Sterzik, M.F., Alcalá, J.M., Covino, E., & Petr, M.G. 1999, A&A, 346, L41.Google Scholar
Webb, R.A., Zuckerman, B., Platais, L., et al. 1999, ApJ, 512, L63.CrossRefGoogle Scholar
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