A5007275105- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Earth Systems and Cosmic Evolution
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Calibration and Measurement Techniques
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- History and advancements in chemistry
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Mechanical and Optical Resonators
- Spacecraft and Cryogenic Technologies
- Historical Astronomy and Related Studies
- Nuclear physics research studies
- Chemical and Environmental Engineering Research
- Marine and environmental studies
- Relativity and Gravitational Theory
- Spectroscopy and Laser Applications
University of Vienna
2021-2025
Laboratoire d'Astrophysique de Bordeaux
2018-2022
Université de Bordeaux
2018-2022
Centre National de la Recherche Scientifique
2018-2022
Institut de Ciències del Cosmos
2019
Institut Català de Ciències del Clima
2019
Universitat de Barcelona
2017-2018
Institut d'Estudis Espacials de Catalunya
2018
Context. The β Pictoris moving group is one of the most well-known young associations in solar neighbourhood and several members are known to host circumstellar discs, planets, comets. Measuring its age precisely essential study astrophysical processes, such as planet formation disc evolution, which strongly age-dependent. Aims. We aim determine a precise accurate dynamical traceback for group. Methods. Our sample combines extremely Gaia DR2 astrometry with ground-based radial velocities...
The distribution of member stars in the surroundings an Open Cluster (OC) can shed light on process its formation, evolution and dissolution. analysis structural parameters OCs as a function their age position Galaxy brings constraints theoretical models cluster evolution. Gaia catalogue is very appropriate to find members at large distance from centers. We aim revisiting membership lists solar vicinity, particular by extending these peripheral areas thanks EDR3. used clustering algorithm...
We reconstructed the star formation history of Sco-Cen OB association using a novel high-resolution age map region. developed an approach to produce robust ages for Sco-Cen’s recently identified 37 stellar clusters SigMA algorithm. The timeline reveals four periods enhanced activity, or bursts, remarkably separated by about 5 Myr. Of these, second burst, which occurred 15 million years ago, is far dominant one, and most stars were in place end this burst. correlated but not linearly,...
The TW Hydrae Association (TWA) is a young local association (YLA) about 50 pc from the Sun, offering unique opportunity to study star and planet formation processes in detail. We characterized TWA's location, kinematics, age, investigating its origin within Scorpius-Centaurus (Sco-Cen) OB association. Using Gaia DR3 astrometric data precise ground-based radial velocities, we identified substructures TWA, tentatively dividing them into TWA-a TWA-b. Sco-Cen's massive cluster σ Cen (15 Myr,...
We aim to study spatial and kinematic substructures of the region encompassed by Upper Scorpius Ophiuchus star-forming regions, determining dynamical traceback ages studying star formation history complex. identified seven different groups in this region. Four (nu Sco, beta sigma Sco delta Sco) are part Scorpius, two (rho Oph alpha Ophiuchus, another group (pi is a nearby young population. found an age gradient from rho (the youngest) (<~5 Myr), showing that was sequential process for past 5...
Context: Lupus is recognised as one of the closest star-forming regions, but lack trigonometric parallaxes in pre-Gaia era hampered many studies on kinematic properties this region and led to incomplete censuses its stellar population. Aims: We use second data release Gaia space mission combined with published ancillary radial velocity revise census stars investigate 6D structure complex. Methods: performed a new membership analysis association based astrometric photometric over field 160...
Corona-Australis is one of the nearest regions to Sun with recent and ongoing star formation, but current picture its stellar (and substellar) content not complete yet. We take advantage second data release Gaia space mission revisit census search for additional members young association in Corona-Australis. applied a probabilistic method infer membership probabilities based on multidimensional astrometric photometric set over field 128 deg$^{2}$ around dark clouds region. identify 313...
Free-floating planets (FFPs) are the lightest products of star formation and they carry important information on initial conditions environment in which were formed. They first discovered 2000s but still few them have been identified confirmed due to observational challenges. This is a review last advances detection these objects understanding their origin. Several studies indicate that observed fraction FFPs outnumbers prediction turbulent fragmentation suggest many formed planetary systems...
As the Solar System orbits Milky Way, it encounters various Galactic environments, including dense regions of interstellar medium (ISM). These can compress heliosphere, exposing parts to ISM while also increasing influx dust into and Earth's atmosphere. The discovery new structures, such as Radcliffe wave, raises question whether Sun has encountered any them. present study investigates potential passage through wave gas structure over past 30 million years (Myr). We used a sample 56...
We studied 12 disk streams found in a 250^3 pc^3 volume the solar neighborhood, which we define as coeval and comoving stellar structures with aspect ratios greater than 3:1. Using Gaia Data Release 3 data advanced clustering algorithms SigMA Uncover identified characterized these beyond search volume, doubling, on average, their known populations. estimate number density of to be ≈ 820 objects,/,kpc^3 (for $|Z| < 100$,pc), or surface densities 160 objects,/,kpc^2. These estimates surpass...
The TW Hydrae Association (TWA) is a young local association (YLA) about 50 pc from the Sun, offering unique opportunity to study star and planet formation processes in detail. We characterized TWA's location, kinematics, age, investigating its origin within Scorpius-Centaurus (Sco-Cen) OB association. Using Gaia DR3 astrometric data precise ground-based radial velocities, we identified substructures TWA, tentatively dividing them into TWA-a TWA-b. Sco-Cen's massive cluster $\sigma$ Cen (15...
<title>Abstract</title> Free-floating planets (FFPs) - planetary-mass objects that roam the galaxy unbound to any star have been identified through both indirect microlensing detections in field \citep{Mroz2017, Sumi2023} and direct observations within young, nearby star-forming regions \citep{Tamura1998, Zapatero2000, Lucas2000, PenaRamirez2012, Lodieu2018, Suarez2019, Luhman&Hapich2020, MiretRoig2022a, Pearson2023, Langeveld2024, Martin2024, Luhman2024, DeFurio2024}. Simulations...
As the Earth and other planets orbit around Sun, Solar System itself revolves center of Milky Way, our Galaxy. The Was is far from being a static homogeneous environment. On large scales, stars, gas, dust are organized into rotating spiral structure that extend galactic disk. smaller environment between also known as interstellar medium (ISM), continuously shaped by different&#160; events mechanism, like supernovae explosions, stellar winds, Galactic shear, magnetic fields,...
Context: Chamaeleon is the southernmost low-mass star-forming complex within 200 pc from Sun. Its stellar population has been extensively studied in past, but current census of content not complete yet and deserves further investigation. Aims: We take advantage second data release \textit{Gaia} space mission to expand stars revisit properties populations associated I (Cha I) II II) dark clouds. Methods: perform a membership analysis sources catalogue over field 100 deg$^{2}$ encompassing...
Context. Ruprecht 147 is the oldest (2.5 Gyr) open cluster in solar vicinity (< 300 pc), making it an important target for stellar evolution studies and exoplanet searches. Aims. Derive a census of members luminosity, mass, spatial distributions cluster. Methods. We use astro-photometric data set including all available information from literature together with our own observations. process updated version existent membership selection methodology. Results. identify 259 high-probability...
ABSTRACT The Tucana-Horologium association is one of the closest young stellar groups to Sun and despite close proximity its age still debated in literature. We take advantage state-of-the-art astrometry delivered by third data release Gaia space mission combined with precise radial velocity measurements obtained from high-resolution spectroscopy investigate dynamical association. perform an extensive traceback analysis using a combination different samples cluster members, metrics evaluate...
Context: Stellar clusters are benchmarks for theories of star formation and evolution. The high precision parallax data the Gaia mission allows significant improvements in distance determination to stellar its stars. In order have accurate precise determinations, systematics like spatial correlations need be accounted for, especially stars small sky regions. Aims: Provide astrophysical community with a free open code designed simultaneously infer cluster parameters (i.e. size) distances...
The stellar [$\alpha$/Fe] abundance is sometimes used as a proxy for age, following standard chemical evolution models the Galaxy, seen by different observational results. In this work we show that Open Cluster NGC6705/M11 has significant $\alpha$-enhancement [$\alpha$/Fe]$>0.1$ dex, despite its young age ($\sim$300 Myr), challenging current paradigm. We use high resolution (R$>65,000$) signal-to-noise ($\sim$70) spectra of 8 Red Clump stars, acquired within OCCASO survey. determine very...
The Young Local Associations constitute an excellent sample for the study of a variety astrophysical topics, especially star formation process in low-density environments. Data from Gaia mission allows us to undertake studies YLAs with unprecedented accuracy. We determine dynamical age and place birth set associations uniform dynamically consistent manner. There are nine our $ε$ Chamaeleontis, TW Hydrae, $β$ Pictoris, Octans, Tucana-Horologium, Columba, Carina, Argus AB Doradus. designed...
Context. A rich population of low-mass brown dwarfs and isolated planetary mass objects has been reported in the Upper Scorpius Ophiuchus star-forming complex. Aims. We investigate membership, nature, properties 17 these candidates using low-resolution near-infrared spectra. Methods. investigated membership by looking for evidence their youth four diagnostics: slope continuum between J Ks band, H cont , TLI-g gravity-sensitive indices. In addition, we compared spectra to young field (old) M...
Context. The ages of young star clusters are fundamental clocks to constrain the formation and evolution pre-main-sequence stars their protoplanetary disks exoplanets. However, dating methods for very often disagree, casting doubts on accuracy derived ages. Aims. We propose a new method derive kinematic age based evaporation stars. Methods. was validated calibrated using hundreds identified in supernova-driven simulation interstellar medium forming approximately 40 Myr within 250 pc region....