Sascha P. Quanz

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The Mid-infrared E-ELT Imager and Spectrograph (METIS) for the European Extremely Large Telescope (EELT) consists of diffraction-limited imagers that cover 3 to 14 microns with medium resolution (R ∼ 5000) long slit spectroscopy, and an integral field spectrograph for high spectral resolution spectroscopy (R ∼ 100, 000) over the L and M bands. One of the(More)
We present L and J-band high-contrast observations of HD169142, obtained with the VLT/NACO AGPM vector vortex coronagraph and the Gemini Planet Imager, respectively. A source located at 0”.156±0”.032 north of the host star (PA=7.4±11.3) appears in the final reduced L image. At the distance of the star (∼145 pc), this angular separation corresponds to a(More)
Aims. We investigate the nature of the innermost regions with radii of several AUs of seven circumstellar disks around pre-mainsequence stars, T Tauri stars in particular. Our object sample contains disks apparently at various stages of their evolution. Both single stars and spatially resolved binaries are considered. In particular, we search for inner disk(More)
We present the first mid-infrared interferometric measurements of FU Orionis. We clearly resolve structures that are best explained with an optically thick accretion disk. A simple accretion disk model fits the observed SED and visibilities reasonably well and does not require the presence of any additional structure such as a dusty envelope. The(More)
The presence of an unseen ‘Planet 9’ on the outskirts of the Solar system has been invoked to explain the unexpected clustering of the orbits of several Edgeworth–Kuiper Belt Objects. We use N-body simulations to investigate the probability that Planet 9 was a free-floating planet (FFLOP) that was captured by the Sun in its birth star formation environment.(More)
We present Spitzer/IRAC photometry on the star-forming H II region N 90, related to the young stellar association NGC 602 in the Small Magellanic Cloud. Our photometry revealed bright mid-infrared sources, which we classify with the use of a scheme based on templates and models of red sources in the Milky Way, and criteria recently developed from the(More)
Context. Results from gravitational microlensing suggested the existence of a large population of free-floating planetary mass objects. The main conclusion from this work was partly based on constraints from a direct imaging survey. This survey determined upper limits for the frequency of stars that harbor giant exoplanets at large orbital separations.(More)
The Magellanic Clouds (MCs) offer an outstanding variety of young stellar associations, in which large samples of low-mass stars (with M ∼ 1 M⊙) currently in the act of formation can be resolved and explored sufficiently with the Hubble Space Telescope. These premain sequence (PMS) stars provide a unique snapshot of the star formation process, as it is(More)