6 papers · 1 filter
NAHUAL: A cool spectrograph for planets of ultra-cool objects
E. W. Guenther, E. L. Martin, D. Barrado y Navascues +1
We present the status of an ongoing study to built a a high resolution near infrared Echelle spectrograph (NAHUAL) for the 10.4-m-Gran Telescopio Canarias (GTC) which will be espec…
Direct detection of exo-planets: GQ Lupi
Ralph Neuhaeuser, Eike Guenther, Peter Hauschildt
We present a comparison of our VLT/NACO K-band spectrum of the GQ Lupi companion with the new GAIA-dusty model atmosphere grid for T=2000 and 2900 K and log g from 0 to 4. Then, we…
BS Indi: An enigmatic object
E. W. Guenther, E. Covino, J. M Alcala +2
BS Ind is a young K0V star in the Tucana association. Photometric observations with the Hipparcos satellite show an eclipse-like light-curve with primary and secondary eclipse. The…
Multiwavelength study of X-ray emitting A- and B-stars testing the companion hypothesis
B. Stelzer, N. Huelamo, S. Hubrig +3
We report on the first results of a multi-wavelength approach to test the hypothesis that the X-ray emission from intermediate-mass stars is generated by late-type magnetically act…
A direct imaging search for wide (sub)stellar companions around rad-vel planet host stars
M. Mugrauer, R. Neuhäuser, T. Mazeh +3
We present an overview of our ongoing systematic search for wide (sub)stellar companions around the stars known to host rad-vel planets. By using a relatively large field of view a…
An infrared imaging search for low-mass companions to members of the young nearby beta Pic and Tucana/Horologium associations
Ralph Neuh"auser, E. W. Guenther, J. Alves +3
We present deep high dynamic range infrared images of young nearby stars in the Tucana/Horologium and beta Pic associations, all ~ 10 to 35 Myrs young and at ~10 to 60 pc distance.…