A5049690883- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Molecular Spectroscopy and Structure
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- History and Developments in Astronomy
- Gamma-ray bursts and supernovae
- Advanced Combustion Engine Technologies
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Space Exploration and Technology
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Nuclear physics research studies
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Atomic and Molecular Physics
- earthquake and tectonic studies
- Plant Water Relations and Carbon Dynamics
- Soil Moisture and Remote Sensing
- Geomagnetism and Paleomagnetism Studies
European Southern Observatory
2014-2023
Ludwig-Maximilians-Universität München
2020
Sto (Germany)
2016
Max Planck Society
2002
Max Planck Institute for Radio Astronomy
2002
European Southern Observatory
2002
We describe the design, development, and performance of HAWK-I, new High-Acuity Wide-field K-band Imager for ESO's Very Large Telescope, which is equipped with a mosaic four 2 k arrays operates from 0.9-2.4 μm over 0.1´´ pixels. A novel feature use all reflective optics that, together filters excellent throughput detectors high quantum efficiency, has yielded an extremely throughput. Commissioning science verification observations have already delivered variety deep images that demonstrate...
We report on our analysis of the VISTA Orion ZYJHKs photometric data (completeness magnitudes Z=22.6 and J=21.0mag) focusing a circular area 2798.4 arcmin^2 around young sigma Orionis star cluster (~3Myr, ~352pc, solar metallicity). The combination photometry with optical, WISE Spitzer allows us to identify total 210 member candidates masses in interval 0.25-0.004Msun, 23 which are new planetary-mass object findings. These discoveries double number known so far. One has colors compatible T...
Transit spectroscopy is one of the most commonly used techniques for exoplanet atmosphere characterisation. This technique has been to detect ionized and neutral species in atmospheres by comparing observed stellar lines out transit. The centre-to-limb variation (CLV) across disk an important effect transmission spectroscopy, since it results a change line depth when planet transits different parts disk. We reanalyse transit data HD 189733b taken with HARPS spectrograph study CLV during...
We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee Ib/c 1999ex, both which were hosted by galaxy IC 5179. For we obtained a continuous sequence with an unprecedented wavelength temporal coverage beginning 9 days before maximum light extending through day 42. Before displayed normal spectrum strong Si II λ6355 absorption, thus showing that not all slow-declining supernovae (SNe) are spectroscopically peculiar at these evolutionary phases. A comparative study...
We report on a high-spatial-resolution survey for binary stars in the periphery of Orion Nebula Cluster, at 5 - 15 arcmin (0.65 2 pc) from cluster center. observed 228 with adaptive optics systems, order to find companions separations 0.13" 1.12" (60 500 AU), and detected 13 new binaries. Combined results Petr (1998), we have sample 275 objects, about half which masses literature high probabilities be members. used an improved method derive completeness limits observations, takes into...
As part of the Accretion Discs in H$\alpha$ with OmegaCAM (ADHOC) survey, we imaged r, i and H-alpha a region 12x8 square degrees around Orion Nebula Cluster. Thanks to high-quality photometry obtained, discovered three well-separated pre-main sequences color-magnitude diagram. The populations are all concentrated towards cluster's center. Although several explanations can be invoked explain these left two competitive, but intriguing, scenarios: population unresolved binaries an exotic mass...
We use HAWK-I, the recently-commissioned near-IR imager on Yepun (VLT-UT4), to obtain wide-field, high-resolution images of X-ray luminous galaxy cluster XMMU J2235.3-2557 in J and Ks bands, we these build a colour-magnitude diagram galaxies. Galaxies core form tight red sequence with mean colour 1.9 (Vega system). The intrinsic scatter galaxies that lie is similar measured for Coma cluster. slope location can be modelled by passively evolving backwards time. Using simple stellar population...
Orion A hosts the nearest massive star factory, thus offering a unique opportunity to resolve processes connected with formation of both low- and high-mass stars. Here we present most detailed sensitive near-infrared (NIR) observations entire molecular cloud date. With combination high image quality, survey coverage, sensitivity, our NIR aims at establishing solid empirical foundation for further studies this important cloud. In first paper observations, data reduction, source catalog...
Abstract With the rapid developments in exoplanet field, more and terrestrial exoplanets are being detected. Characterizing their atmospheres using transit observations will become a key datum quest for detecting an Earth-like exoplanet. The atmospheric transmission spectrum of our Earth be ideal template comparison with future exo-Earth candidates. By observing lunar eclipse, which offers similar configuration to that transit, we have obtained high-resolution high signal-to-noise ratio...
The Magellanic Clouds are a nearby pair of interacting dwarf galaxies and satellites the Milky Way. Studying their kinematic properties is essential to understanding origin dynamical evolution. They have prominent tidal features kinematics these can give hints about formation dwarfs, galaxy merging stripping gas. In addition they an example that in process with massive galaxy. goal this study investigate Bridge, feature connecting Clouds, using stellar proper motions understand most recent...
We present near-infrared spectroscopic observations of massive stars in three stellar clusters located the direction inner Galaxy. One them, Quartet, is a new discovery while other two were previously reported as candidate identified on mid-infrared Spitzer images (GLIMPSE20 and GLIMPSE13). Using medium-resolution (R = 900–1320) H K spectroscopy, we firmly establish nature brightest these clusters, yielding identifications an early WC Ofpe/WN9 Quartet star GLIMPSE20. combine this information...
This study aims to determine the impact of stellar binary companions on lifetime and evolution circumstellar disks in Chamaeleon I (Cha I) star-forming region by measuring frequency strength accretion dust signatures around individual components T Tauri stars. We used high-angular resolution adaptive optics JHKL'-band photometry 1.5-2.5mu spectroscopy 19 visual 7 triple stars Cha - including one newly discovered tertiary component with separations between ~25 ~1000au. The data allowed us...
The atmospheres of exoplanets are commonly studied by observing the transit planet passing in front its parent star. obscuration part stellar disk during a will reveal aspects surface structure resulting from general centre-to-limb variations (CLVs). These become apparent when forming ratio between light and out transit. phenomena can be seen particularly clearly progress penumbral lunar eclipse, where Earth transits solar masks different regions as eclipse progresses. When inferring...
The Orion cloud complex presents a variety of star formation mechanisms and properties it is still one the most intriguing targets for studies. We present VISTA/VIRCAM near-infrared observations L1630N forming region, including stellar clusters NGC 2068 2071, in molecular B discuss them combination with Spitzer data. select 186 young object (YSO) candidates region on basis multi-colour criteria, confirm YSO nature majority using published spectroscopy from literature, use this sample to...
Aims.The occurrence of new FU Orionis-like objects is fundamental to understand the outburst mechanism in young stars and their role star formation disk evolution. Our work aimed at investigating properties recent V1647 Ori.
Nearby young clusters are privileged places to study the star formation history. Over last decade, sigma-Orionis cluster has been a prime location for of very low mass stars, substellar and isolated planetary objects determination initial function. To extend previous studies this association its core, we searched ultracool members new multiple systems within 1.5'x1.5' central region cluster. We obtained deep multi-conjugate adaptive optics (MCAO) images core with prototype MCAO facility MAD...
The variation of the period distribution function late-type binaries is studied. It shown that Taurus--Auriga pre-main sequence population and main G dwarf sample do not stem from same parent with better than 95 per cent confidence probability. Lupus, Upper Scorpius A populations are to be compatible being drawn initial (IPF), which inconsistent data. Two possible IPF forms used find distributions various permutations available data include B (UScB), Chameleon Orion Nebula Cluster samples....
We present a study of protoplanetary disks in spatially resolved low-mass binary stars the Orion Nebula Cluster (ONC) to assess impact binarity on properties circumstellar disks. This is currently largest such clustered high-stellar-density star-forming environment. particularly aim determine presence magnetospheric accretion and dust for each component, measure overall disk frequency. carried out adaptive-optics-assisted observations acquire near-IR photometry spectroscopy 26 binaries ONC,...
We present the results of a survey low mass star and brown dwarf population 25 Orionis group. Using optical photometry from CIDA Deep Survey Orion, near IR Visible Infrared Telescope for Astronomy resolution spectroscopy obtained with Hectospec at MMT, we selected 1246 photometric candidates to stars dwarfs estimated masses within $0.02 \lesssim M/M_\odot 0.8$ spectroscopically confirmed sample 77 as new members cluster mean age $\sim$7 Myr. have system initial function group that can be...
Context. We present the first high spatial-resolution monitoring of dust-forming nova V1280 Sco, performed with Very Large Telescope Interferometer (VLTI).