Sipos, N., Ábrahám, P., Acosta-Pulido, J., Juhász, A., Kóspál, Á., Kun, M., ...
EX Lup is the prototype of EXors, a subclass of low-mass pre-main sequence stars whose episodic eruptions are attributed to temporarily increased accretion. In quiescence the optical and...
Testing planet formation theories with Giant stars (2008)
Pasquini, Luca, Doellinger, M. P., Hatzes, A., Setiawan, J., Girardi, L., Da Silva, L., ...
Planet searches around evolved giant stars are bringing new insights to planet formation theories by virtue of the broader stellar mass range of the host stars compared to the solar-type stars that...
Si and Ca abundances of a selected sample of evolved stars (2008)
Da Silva, L., Girardi, L., Pasquini, L., De Medeiros, R., Setiawan, J., Döllinger, M., ...
Metallicity and age of selected G-K giants (2008)
Pasquini, Luca, Döllinger, M., Setiawan, J., Hatzes, A., Girardi, L., Da Silva, L., ...
Testing planet formation theories with giant stars (2008)
Pasquini, Luca, Döllinger, M. P., Hatzes, A., Setiawan, J., Girardi, L., Da Silva, L., ...
Si and Ca abundances of a selected sample of evolved stars (2008)
Silva, L. Da, Girardi, L., Pasquini, L., De Medeiros, R., Setiawan, J., Dölinger, M., ...
Not Available
A young massive planet in a star-disk system (2008)
Setiawan, J., Henning, Th, Launhardt, R., Müller, A., Weise, P., Kürster, M.
There is a general consensus that planets form within disks of dust and gas around newly born stars. Details of their formation process, however, are still a matter of ongoing debate. The timescale...
Planets around active stars (2008)
Setiawan, J., Weise, P., Henning, Th, Hatzes, A. P., Pasquini, L., Silva, L. Da, ...
We present the results of radial velocity measurements of two samples of active stars. The first sample contains field G and K giants across the Red Giant Branch, whereas the second sample consists...
MAESTRO-1 b: A transiting planet in a close binary? (2008)
Setiawan, J., Weldrake, D., Afonso, C., Henning, Th, Launhardt, R., Müller, A., ...
We report the detection of a giant planet candidate in a close binary system. This result was obtained from the follow-up radial velocity (RV) measurements of MACHO 120.22303.5389 (MAESTRO-1), a...
Testing planet formation theories with giant stars (2008)
Pasquini, Luca, Döllinger, M. P., Hatzes, A., Setiawan, J., Girardi, L., Da Silva, L., ...
Planet searches around evolved giant stars are bringing new insights to planet formation theories by virtue of the broader stellar mass range of the host stars compared to the solar-type stars that...
The ESPRI project: narrow-angle astrometry with VLTI-PRIMA (2008)
Launhardt, R., Henning, T., Queloz, D., Quirrenbach, A., Delplancke, F., Elias, N. M., ...
We describe the ongoing hardware and software developments that shall enable the ESO VLTI to perform narrow-angle differential delay astrometry in K-band with an accuracy of up to 10 muarcsec. The...
The ESPRI project: astrometric exoplanet search with PRIMA (2008)
Launhardt, R., Queloz, D., Henning, Th, Quirrenbach, A., Delplancke, F., Andolfato, L., ...
PRIMA, the instrument for Phase-Referenced Imaging and Micro-arcsecond Astrometry at the VLTI, is currently being developed at ESO. PRIMA will implement the dual-feed capability, at first for two UTs...
The PRIMA astrometric planet search project (2008)
Launhardt, R., Bakker, E. J., Ballester, P., Baumeister, H., Bizenberger, P., Bleuler, H., ...
Not Available
Planets around giant stars (2008)
Hatzes, A. P., Döllinger, M., Pasquini, L., Setiawan, J., Girardi, L., Da Silva, L.
Not Available
Geisler, R., Setiawan, J., Henning, Th, Queloz, D., Quirrenbach, A., Launhardt, R., ...
The PRIMA (Phase-Referenced Imaging and Micro-arcsecond Astrometry) facility at ESO VLTI (Paranal observatory) is expected to be commissioned in mid 2008. The ESPRI (Exoplanet Search with PRIMA)...
Physical parameters of evolved stars in clusters and in the field fromline-depth ratios (2008)
Biazzo, K., Pasquini, L., Frasca, A., Silva, L. Da, Girardi, L., Hatzes, A. P., ...
We present a high-resolution spectroscopic analysis of two samples of evolved stars selected in the field and in the intermediate-age open cluster IC 4651, for which detailed measurements of chemical...
Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars (2007)
Pasquini, L., Doellinger, M. P., Weiss, A., Girardi, L., Chavero, C., Hatzes, A. P., ...
Exo-planets are preferentially found around high metallicity main sequence stars. We aim at investigating whether evolved stars share this property, and what this tells about planet formation....
Biazzo, K., Pasquini, L., Girardi, L., Frasca, A., Da Silva, L., Setiawan, J., ...
We test our capability of deriving stellar physical parameters of giant stars by analysing a sample of field stars and the well studied open cluster IC 4651 with different spectroscopic methods. The...
Planets around active stars (2007)
Setiawan, J., Weise, P., Henning, Th., Hatzes, A. P., Pasquini, L., Da Silva, L., ...
We present the results of radial velocity measurements of two samples of active stars. The first sample contains field G and K giants across the Red Giant Branch, whereas the second sample consists...
Physical parameters of evolved stars in clusters and in the field from line-depth ratios (2007)
Biazzo, K., Pasquini, L., Frasca, A., Da Silva, L., Girardi, L., Hatzes, A. P., ...
We present a high-resolution spectroscopic analysis of two samples of evolved stars selected in the field and in the intermediate-age open cluster IC 4651, for which detailed measurements of chemical...
Evidence for a planetary companion around a nearby young star (2007)
Setiawan, J., Weise, P., Henning, Th., Launhardt, R., Müller, A., Rodmann, J.
We report evidence for a planetary companion around the nearby young star HD 70573. The star is a G type dwarf located at a distance of 46 pc with age estimation between 20 and 300 Myrs. We carried...
Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting stars (2007)
Pasquini, L., Döllinger, M. P., Weiss, A., Girardi, L., Chavero, C., Hatzes, A. P., ...
Evidence for a panetary companion around a nearby young star (2007)
Setiawan, J., Weise, P., Henning, Th, Launhardt, R., Müller, A., Rodmann, J.
We report evidence for a planetary companion around the nearby young star HD 70573. The star is a G-type dwarf located at a distance of 46 pc. We carried out spectroscopic observations of this star...
Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting stars (2007)
Pasquini, L., Döllinger, M. P., Weiss, A., Girardi, L., Chavero, C., Hatzes, A. P., ...
Aims. Exo-planets are preferentially found around high metallicity main sequence stars. We investigate whether evolved stars share this property, and its implications for planet formation. Methods:...
Biazzo, K., Pasquini, L., Girardi, L., Frasca, A., Da Silva, L., Setiawan, J., ...
Aims.We test our capability of deriving stellar physical parameters of giant stars by analysing a sample of field stars and the well studied open cluster IC 4651 with different spectroscopic methods....
Basic physical parameters of a selected sample of evolved stars (2006)
Da Silva, L., Girardi, L., Pasquini, L., Setiawan, J., De Medeiros, J. R., ...
We present the detailed spectroscopic analysis of 72 evolved stars, including the [Fe/H] determination for the whole sample. These metallicities, together with the Teff values and the absolute V...
Radial velocity variations of G and K giants (2006)
Döllinger, M. P., Pasquini, L., Hatzes, A., Weiss, A., Setiawan, J., Da Silva, L., ...
Basic physical parameters of a selected sample of evolved stars (2006)
Da Silva, L., Girardi, L., Pasquini, L., Setiawan, J., De Medeiros, J. R., ...
Multi-periodic oscillations of HD 32887 and HD 81797 (2006)
Setiawan, J., Roth, M., Weise, P., Dölinger, M. P.
In this paper we present two evolved stars, HD 32887 and HD 81797, which show multi-periodic oscillations. We observed the oscillations by means of the precise radial velocity technique with the...
Radial velocity variations of G and K giants (2006)
Döellinger, M. P., Pasquini, L., Hatzes, A., Weiss, A., Setiawan, J., Da Silva, L., ...
G and K giants are a new class of radial velocity (RV) variables. In order to reveal the reasons of this variability we started in February 2004 a program to observe a northern sample of 62 K giants...
Basic physical parameters of a selected sample of evolved stars (2006)
Da Silva, L., Girardi, L., Pasquini, L., Setiawan, J., De Medeiros, J. R., ...
We present the detailed spectroscopic analysis of 72 evolved stars, which were previously studied for accurate radial velocity variations. Using one Hyades giant and another well studied star as the...
Asteroseismology of K Giants (2006)
Di Mauro, M. P., Cardini, D., D'Antona, F., Weiss, A., Döllinger, M. P., Pasquini, L., ...
A substellar companion around the intermediate-mass giant star HD 11977 (2005)
Setiawan, J., Rodmann, J., Da Silva, L., Hatzes, A. P., Pasquini, L., ...
We report the discovery of a substellar companion to the intermediate-mass star HD 11977 (G5 III). Radial velocities of this star have been monitored for five years with FEROS at the 1.52-m ESO and...
Multi-periodic oscillations of alpha Hya (2005)
Setiawan, J., Weise, P., Roth, M.
We report the detection of multi-periodic oscillations of the cool evolved star alpha Hya (HD 81797, K3II-III). Two-hundred and forty-three high-resolution spectra (R=48,000) of this star have been...
Atmospheric parameters of a sample of giant stars with accurate radial velocity variations (2005)
Da Silva, L., Girardi, L., Pasquini, L., Döllinger, M., De Medeiros, R., Setiawan, J., ...
A substellar companion around the intermediate-mass giant star HD 11977 (2005)
Setiawan, J., Rodmann, J., Da Silva, L., Hatzes, A. P., Pasquini, L., ...
We report the discovery of a substellar companion to the intermediate-mass star HD 11977 (G5 III). Radial velocities of this star have been monitored for five years with FEROS at the 1.52-m ESO and...
Towards high-precision ground-based astrometry: Differential delay lines for PRIMA@VLTI (2005)
Launhardt, R., Henning, Th., Queloz, D., Quirrenbach, A., Bakker, E. J., Baumeister, H., ...
Deriving unambiguously the orbital parameters and masses of extrasolar planets requires at least 2-dimensional information on either the positions or motions of the planet directly (currently out of...
Reffert, S., Launhardt, R., Hekker, S., Henning, Th., Queloz, D., Quirrenbach, A., ...
ESO's PRIMA (Phase-Referenced Imaging and Micro-arcsecond Astrometry) facility at the VLT Interferometer on Cerro Paranal in Chile is expected to be fully operational in only a few years from now....
Setiawan, J., Pasquini, L., Da Silva, L., Hatzes, A. P., Girardi, L., ...
We present the results of our radial velocity (RV) measurements of G and K giants, concentrating on the presence of multiple systems in our sample. Eighty-three giants have been observed for 2.5...
The PRIMA astrometric planet search project (2004)
Quirrenbach, A., Henning, T., Queloz, D., Albrecht, S., Bakker, E. J., Baumeister, H., ...
Preparing the PRIMA astrometric planet search: selecting suitable target and reference stars (2004)
Frink, S., Hekker, S., Launhardt, R., Setiawan, J., Segransan, D., Quirrenbach, A., ...
PRIMA astrometry operations and software (2004)
Bakker, E., Quirrenbach, A., Tubbs, R., Segransan, D., Launhardt, R., Venema, L., ...
Binaries from FEROS radial velocity survey (2004)
Setiawan, J., Da Silva, L., Pasquini, L., Hatzes, A. P., Girardi, L., ...
Towards High-Precision Ground-Based Astrometry: Differential Delay Lines for PRIMA@VLTI (2004)
Launhardt, R., Henning, Th., Queloz, D., Quirrenbach, H., Bakker, E., Baumeister, H., ...
The PRIMA Astrometric Planet Search project (2004)
Quirrenbach, A., Henning, T., Queloz, D., Albrecht, S., Bakker, E. J., Baumeister, H., ...
PRIMA astrometry operations and software (2004)
Bakker, E. J., Quirrenbach, A., Tubbs, R. N., Segransan, D., Launhardt, R., Venema, L. B., ...
Evidence of a sub-stellar companion around HD 47536 (2003)
Setiawan, J., Hatzes, A. P., Pasquini, L., Naef, D., Da Silva, L., ...
We report evidence of a low-mass companion around the K1III giant star HD 47536. This star belongs to our sample of 83 subgiant and giant stars studied for their radial velocity variations using the...
Precise radial velocity measurements of G and K giants. First results (2003)
Setiawan, J., Pasquini, L., Da Silva, L., Hatzes, A.
We present the first results of our precise radial velocity (RV) measurements of G and K giants. A number of stars from our list of 80 targets have been observed for 14 months using the fibre-fed...
Multiwavelenght analysis of Gl 355 (LQ Hya) (2001)
Covino, S., Tagliaferri, G., Bertone, E., Cutispoto, G., Messina, S., Panzera, M. R., ...
We discuss ROSAT, ASCA, {\it Beppo}SAX and optical observations of the young active star Gl 355. During the ROSAT observation a strong flare was detected with a peak flux more than an order of...