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...
Exoplanet search with astrometry (2009)
Searching for extrasolar planets by direct detection is extremely challenging for current instrumentation. Indirect methods, that measure the effect of a planet on its host star, are much more...
Darwin -— an experimental astronomy mission to search for extrasolar planets (2009)
Cockell, Charles S., Herbst, Tom, Léger, Alain, Absil, O., Beichman, Charles, Benz, Willy, ...
As a response to ESA call for mission concepts for its Cosmic Vision 2015–2025 plan, we propose a mission called Darwin. Its primary goal is the study of terrestrial extrasolar planets and the...
Darwin---an experimental astronomy mission to search for extrasolar planets (2009)
Cockell, Charles S, Herbst, Tom, Léger, Alain, Absil, Olivier, Beichman, Charles, Benz, Willy, ...
As a response to ESA call for mission concepts for its Cosmic Vision 2015--2025 plan, we propose a mission called Darwin. Its primary goal is the study of terrestrial extrasolar planets and the...
Tests of achromatic phase shifters performed on the SYNAPSE test bench: a progress report (2008)
Gabor, Pavel, Schuller, Peter A., Chazelas, Bruno, Decaudin, Michel, Labèque, Alain, Duret, Philippe, ...
The achromatic phase shifter (APS) is a component of the Bracewell nulling interferometer studied in preparation for future space missions (viz. Darwin/TPF-I) focusing on spectroscopic study of...
IRAM-PdBI Observations of Binary Protostars I: The Hierarchical System SVS13 in NGC1333 (2008)
Chen, Xuepeng, Launhardt, Ralf, Henning, Thomas
We present millimeter interferometric observations of the young stellar object SVS13 in NCG1333 in the N2H+(1-0) line and at 1.4 and 3mm dust continuum, using the IRAM Plateau de Bure interferometer....
Chemistry in Disks. II. -- Poor molecular content of the AB Aur disk (2008)
Schreyer, Katharina, Guilloteau, Stéphane, Semenov, Dmitry, Bacmann, Aurore, Chapillon, Edwige, Dutrey, Anne, ...
We study the molecular content and chemistry of a circumstellar disk surrounding the Herbig Ae star AB Aur at (sub-)millimeter wavelengths. Our aim is to reconstruct the chemical history and...
Chen, Xuepeng, Bourke, Tyler L., Launhardt, Ralf, Henning, Thomas
We present interferometric observations in the 12CO (2-1) line and at 1.3 mm dust continuum of the low-mass protostellar binary system in the cometary globule CG30, using the Submillimeter Array. The...
ATCA and Spitzer Observations of the Binary Protostellar Systems CG30 and BHR71 (2008)
Chen, Xuepeng, Launhardt, Ralf, Bourke, Tyler L., Henning, Thomas, Barnes, Peter J.
We present interferometric observations with resolution of ~3 arcsecs of the isolated, low-mass protostellar double cores CG30 and BHR71 in the N2$H+(1-0) line and at 3mm dust continuum, using the...
Chen, Xuepeng, Bourke, Tyler L., Launhardt, Ralf, Henning, Thomas
We present interferometric observations in the 12CO (2-1) line and at 1.3 mm dust continuum of the low-mass protostellar binary system in the cometary globule CG 30, using the Submillimeter Array....
ATCA and Spitzer observations of the binary protostellar systems CG 30 and BHR 71 (2008)
Chen, Xuepeng, Launhardt, Ralf, Bourke, Tyler L., Henning, Thomas, Barnes, Peter J.
We present interferometric observations of the isolated, low-mass protostellar double cores CG 30 and BHR 71 in the N2H+ (1-0) line and at 3 mm dust continuum, using the Australian Telescope Compact...
Tests of achromatic phase shifters performed on the SYNAPSE test bench: a progress report (2008)
Gabor, Pavel, Schuller, Peter A., Chazelas, Bruno, Decaudin, Michel, Labèque, Alain, Duret, Philippe, ...
The achromatic phase shifter (APS) is a component of the Bracewell nulling interferometer studied in preparation for future space missions (viz. Darwin/TPF-I) focusing on spectroscopic study of...
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...
Verification and acceptance tests of the PRIMA DDL optics (2008)
Bizenberger, Peter, Baumeister, Harald, Graser, Uwe, Henning, Thomas, Krause, Nathalie, Launhardt, Ralf, ...
The last step in designing and building instruments are the verification and acceptance tests of the assembled units and of the final instrument. For instruments, which are engineered to work at the...
OVRO N2H+ Observations of Class 0 Protostars: Constraints on the Formation of Binary Stars (2007)
Chen, Xuepeng, Launhardt, Ralf, Henning, Thomas
We present the results of an interferometric study of the N2H+(1--0) emission from nine nearby, isolated, low-mass protostellar cores, using the OVRO millimeter array. The main goal of this study is...
Dutrey, Anne, Henning, Thomas, Guilloteau, S., Semenov, Dmitry, Piétu, Vincent, Schreyer, Katharina, ...
Aims: To constrain the ionization fraction in protoplanetary disks, we present new high-sensitivity interferometric observations of N$_2$H$^+$ in three disks surrounding DM Tau, LkCa 15, and MWC 480....
OVRO N2H+ observations of class 0 protostars: constraints on the formation of binary stars (2007)
Chen, Xuepeng, Launhardt, Ralf, Henning, Thomas
We present the results of an interferometric study of the N2H+ (1-0) emission from nine nearby, isolated, low-mass protostellar cores, using the Owens Valley Radio Observatory (OVRO) millimeter...
Dutrey, Anne, Henning, Thomas, Guilloteau, Stephane, Semenov, Dmitry, Pietu, Vincent, Schreyer, Katharina, ...
Aims: To constrain the ionization fraction in protoplanetary disks, we present new high-sensitivity interferometric observations of N$_2$H$^+$ in three disks surrounding DM Tau, LkCa 15, and MWC 480....
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...
Evolution of cold circumstellar dust around solar-type stars (2005)
Carpenter, John M., Wolf, Sebastian, Schreyer, Katharina, Launhardt, Ralf, Henning, Thomas
We present submillimeter (Caltech Submillimeter Observatory 350 mum) and millimeter (Swedish-ESO Submillimetre Telescope [SEST] 1.2 mm, Owens Valley Radio Observatory [OVRO] 3 mm) photometry for 127...
Evolution of Cold Circumstellar Dust Around Solar-Type Stars (2004)
Carpenter, John M., Wolf, Sebastian, Schreyer, Katharina, Launhardt, Ralf, Henning, Th.
We present submillimeter (CSO 350um) and millimeter (SEST 1.2 mm, OVRO 3 mm) photometry for 125 solar-type stars from the FEPS Spitzer Legacy program that have masses between ~0.5 and 2.0 Msun and...
Evolution of Magnetic fields in Bok globules? (2003)
Wolf, Sebastian, Launhardt, Ralf, Henning, Thomas
We study the influence and structure of the magnetic field in the early phases of low-mass star formation using polarization maps of Bok globules at a wavelength of 850micron, obtained with the...
Magnetic field evolution in Bok globules (2003)
Wolf, Sebastian, Launhardt, Ralf, Henning, Thomas
Using the Submillimeter Common-User Bolometer Array (SCUBA) at the James Clerk Maxwell Telescope (JCMT), we obtained submillimeter polarization maps of the Bok globules B335, CB230, and CB244 at...