SOUTHERN MASSIVE STARS AT HIGH ANGULAR RESOLUTION: OBSERVATIONAL CAMPAIGN AND COMPANION DETECTION
- H. Sana, J. Le Bouquin, H. Zinnecker
- Physics
- 22 September 2014
Multiplicity is one of the most fundamental observable properties of massive O-type stars and offers a promising way to discriminate between massive star formation theories. Nevertheless, companions…
First Results from the CHARA Array. VII. Long-Baseline Interferometric Measurements of Vega Consistent with a Pole-On, Rapidly Rotating Star
- J. Aufdenberg, A. Mérand, N. Turner
- Physics
- 13 March 2006
We have obtained high-precision interferometric measurements of Vega with the CHARA Array and FLUOR beam combiner in the K′ band at projected baselines between 103 and 273 m. The measured visibility…
Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
- O. Absil, E. Folco, H. Mcalister
- Physics, Geology
- 12 April 2006
Context. Only a handful of debris disks have been imaged up to now. Due to the need for high dynamic range and high angular resolution, very little is known about the inner planetary region, where…
AN INTERFEROMETRIC STUDY OF THE FOMALHAUT INNER DEBRIS DISK. I. NEAR-INFRARED DETECTION OF HOT DUST WITH VLTI/VINCI
- O. Absil, B. Mennesson, J. Le Bouquin, E. di Folco, P. Kervella, J. Augereau
- Physics, Geology
- 21 August 2009
The innermost parts of dusty debris disks around main-sequence stars are currently poorly known due to the high contrast and small angular separation with their parent stars. Using near-infrared…
PIONIER: a 4-telescope visitor instrument at VLTI
- J. Bouquin, J. Berger, N. Ventura
- Physics
- 9 September 2011
PIONIER stands for Precision Integrated-Optics Near-infrared Imaging ExpeRiment. It combines four 1.8m Auxilliary Telescopes or four 8m Unit Telescopes of the Very Large Telescope Interferometer…
Hot exozodiacal dust resolved around Vega with IOTA/IONIC
- D. Defrére, O. Absil, W. Traub
- Physics, Geology
- 18 August 2011
Context. Although debris discs have been detected around a significant number of main-sequence stars, only a few of them are known to harbour hot dust in their inner part where terrestrial planets…
Deep Exploration of ϵ Eridani with Keck Ms-band Vortex Coronagraphy and Radial Velocities: Mass and Orbital Parameters of the Giant Exoplanet
We present the most sensitive direct imaging and radial velocity (RV) exploration of ϵ Eridani to date. ϵ Eridani is an adolescent planetary system, reminiscent of the early solar system. It is…
A near-infrared interferometric survey of debris-disc stars - III. First statistics based on 42 stars observed with CHARA/FLUOR
- O. Absil, D. Defrére, N. Turner
- Physics, Geology
- 1 July 2013
Context. Dust is expected to be ubiquitous in extrasolar planetary systems owing to the dynamical activity of minor bodies. Inner dust populations are, however, still poorly known because of the high…
Direct imaging of extra-solar planets in star forming regions - Lessons learned from a false positive around IM Lupi
- D. Mawet, O. Absil, K. Stapelfeldt
- Physics, Geology
- 24 July 2012
Context. Most exoplanet imagers consist of ground-based adaptive optics coronagraphic cameras which are currently limited in contrast, sensitivity and astrometric precision, but advantageously…
VIP: Vortex Image Processing Package for High-contrast Direct Imaging
- C. Gonzalez, O. Wertz, J. Surdej
- Computer Science
- 17 May 2017
The capabilities of VIP related to processing image sequences acquired using the angular differential imaging (ADI) observing technique are described and a novel ADI algorithm based on non-negative matrix factorization is presented, which comes from the same family of low-rank matrix approximations as PCA and provides fairly similar results.
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