Sabine Reffert, Ralf Launhardt, Saskia Hekker, Thomas Henning, Didier Queloz, Andreas Quirrenbach, ...
Abstract. 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...
Misaligned spin and orbital axes cause the anomalous precession of DI Herculis (2009)
Albrecht, Simon, Reffert, Sabine, Snellen, Ignas A. G., Winn, Joshua N.
The orbits of binary stars precess as a result of general relativistic effects, forces arising from the asphericity of the stars, and forces from additional stars or planets in the system. For most...
Old, Rich, and Eccentric: Two Jovian Planets Orbiting Evolved Metal-Rich Stars (2009)
Peek, Kathryn M. G., Johnson, John Asher, Fischer, Debra A., Marcy, Geoffrey W., Henry, Gregory W., Howard, Andrew W., ...
We present radial velocity measurements of two stars observed as part of the Lick Subgiants Planet Search and the Keck N2K survey. Variations in the radial velocities of both stars reveal the...
HD 91669B: a new brown dwarf candidate from the McDonald observatory planet search (2009)
Wittenmeyer, Robert A., Endl, Michael, Cochran, William D., Ramírez, Ivan, Reffert, Sabine, MacQueen, Phillip J., ...
HD 91669b: A New Brown Dwarf Candidate from the McDonald Observatory Planet Search (2008)
Wittenmyer, Robert A., Endl, Michael, Cochran, William D., Ramirez, Ivan, Reffert, Sabine, MacQueen, Phillip J., ...
We report the detection of a candidate brown dwarf orbiting the metal-rich K dwarf HD 91669, based on radial-velocity data from the McDonald Observatory Planet Search. HD 91669b is a substellar...
The Discovery of Stellar Oscillations in the K Giant $\iota$ Dra (2008)
Zechmeister, Mathias, Reffert, Sabine, Hatzes, Artie P., Endl, Michael, Quirrenbach, Andreas
$\iota$ Dra (HIP 75458) is a well-known example for a K giant hosting a substellar companion since its discovery by Frink et al. (2002). We present radial velocity measurements of this star from...
Arentoft, Torben, Kjeldsen, Hans, Bedding, Timothy R., Bazot, Michael, Christensen-Dalsgaard, Joergen, Dall, Thomas H., ...
We have carried out a multi-site campaign to measure oscillations in the F5 star Procyon A. We obtained high-precision velocity observations over more than three weeks with eleven telescopes, with...
Janson, Markus, Reffert, Sabine, Brandner, Wolfgang, Henning, Thomas, Lenzen, Rainer, Hippler, Stefan
Due to its proximity, youth, and solar-like characteristics with a spectral type of K2V, Eps Eri is one of the most extensively studied systems in an extrasolar planet context. Based on radial...
The astrometric data-reduction software for exoplanet detection with PRIMA (2008)
Elias, Nicholas M., Köhler, Rainer, Stilz, Ingo, Reffert, Sabine, Geisler, Ronny, Quirrenbach, Andreas, ...
PRIMA/PACMAN is scheduled for commissioning on Paranal in late 2008 as part of the VLTI. In this paper, we discuss the important aspects of its astrometric data-reduction software. For example, the...
Johnson, John A., Marcy, Geoffrey W., Fischer, Debra A., Wright, Jason T., Reffert, Sabine, Kregenow, Julia M., ...
We report precise Doppler measurements of two evolved stars, kappa CrB (HD142091) and HD 167042, obtained at Lick Observatory as part of our search for planets orbiting intermediate-mass subgiants....
Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants (2007)
Johnson, John A., Fischer, Debra A., Marcy, Geoffrey W., Wright, Jason T., Driscoll, Peter, Butler, R. P., ...
We report precision Doppler measurements of three intermediate-mass subgiants from Lick and Keck Observatories. All three stars show variability in their radial velocities consistent with planet-mass...
NACO-SDI direct imaging search for the exoplanet Eps Eri b (2007)
Janson, Markus, Brandner, Wolfgang, Henning, Thomas, Lenzen, Rainer, McArthur, Barbara, Benedict, G. Fritz, ...
The active K2V star $\epsilon$ Eri hosts the most nearby known extrasolar planet. With an angular separation of about 1" on average, and an age of a few to several hundred Myrs, $\epsilon$ Eri b is...
NACO-SDI direct imaging search for the exoplanet e Eri b (2007)
Janson, Markus, Brandner, Wolfgang, Henning, Thomas, Lenzen, Rainer, McArthur, Barbara, Benedict, G. Fritz, ...
The active K2 V star É Eri hosts the nearest known extrasolar planet. With an angular separation of about 1" on average, and an age of a few to several hundred megayears, É Eri b is one of the...
Precise Radial Velocities of Giant Stars II. Pollux and its Planetary Companion (2006)
Reffert, Sabine, Quirrenbach, Andreas, Mitchell, David S., Albrecht, Simon, Hekker, Saskia, Fischer, Debra A., ...
It has long been speculated that the observed periodic radial velocity pattern for the K giant Pollux might be explained in terms of an orbiting planetary companion. We have collected 80...
The PRIMA astrometric planet search: goals and prospects (2006)
Reffert, Sabine, Ségransan, Damien, Launhardt, Ralf, Henning, Thomas, Queloz, Didier, Quirrenbach, Andreas, ...
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 couple of years from...
Radial Velocity Variations in K Giants: Planets or Pulsations? (2005)
Hekker, Saskia, Reffert, Sabine, Quirrenbach, Andreas
Radial velocity observations of K giants have revealed periodic variations for some of the stars. The periods range from approximately 180 to 1000 or more days with velocity amplitudes ranging from...