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22/09/2025, 09:00
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Christiane Göppl22/09/2025, 09:15
The Carina OB1 association is one of the most massive, well-studied star-forming regions in our Galaxy, which is the kind of environment where most of the planets in our Galaxy are formed. We aim to characterize the association's stellar population as stellar clusters and high-mass stars heavily influence planets and disks. We therefore used the Gaia DR3 catalog to identify clusters and their...
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Mari-Liis Aru22/09/2025, 09:30
In clusters with OB-type stars, UV radiation affects the evolution of protoplanetary disks via external photoevaporation. The resulting depletion of disks can be studied in resolved observations of proplyds, where neutral gas is outflowing from the disk and becomes photoionized as it expands and interacts with stellar UV radiation. VLT/MUSE allows us to characterize proplyds in a wealth of...
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Markus Schöller (European Southern Observatory)22/09/2025, 09:45
Herbig Ae/Be stars are surrounded by active accretion disks, as evidenced from excess emission seen in various wavelength regions. From studies of the Zeeman effect in polarimetric spectra of these PMS stars, it is clear that HAeBes host dipolar magnetic fields, which are about a magnitude weaker than those in their lower mass counterparts, the T Tauri stars.
While these weaker magnetic...
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Hala Alqubelat (European Southern Observatory)22/09/2025, 10:00
Accreting binary systems exhibit complex, multi-wavelength variability shaped by their interactions with circumstellar and circumbinary material. DQ Tau, highly eccentric (e = 0.6), equal-mass binary with a 15.7-day period, is a prime target to investigate accretion physics and disk structure in young binaries. With its short orbital period, DQ Tau owns three accretion disks and strongly...
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Alexander Mayer (Max-Planck-Institute for Astrophysics)22/09/2025, 10:15
While recent observations of young protostellar disks have revealed much about their structure, their formation process from molecular cloud cores and subsequent evolution remains relatively poorly understood. In particular, the role of the magnetic field in regulating the angular momentum budget of the system is a central issue. In this talk, zoom-in simulations from a turbulent interstellar...
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Maria Jose Maureira (MPE)22/09/2025, 10:45
Characterizing the physical conditions of disks surrounding young protostars that are still actively accreting from their surroundings is crucial to understanding the mass assembly process of stars and the mechanisms for early planet formation. While the majority of theoretical investigations into the first steps to form planetesimals are still using physical properties akin to more evolved...
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Marta De Simone22/09/2025, 11:00
The earliest phases of planetary system formation are marked by a fascinating and intricate chemistry, with a high abundance of prebiotic molecules detected in protostellar environments. This chemical complexity serves as a crucial diagnostic tool to understand the underlying physical processes shaping these nascent systems, and to probe the chemical evolution from prestellar core to more...
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Miguel Vioque (miguel.vioque@eso.org)22/09/2025, 11:15
I will show how to use Gaia astrometry to indentify binaries and companions in forming stars. I will exemplify the power of this technique with a few science cases, from newly identified protoplanets within the gaps and cavities of protoplanetary disks to a reassesment of the multiplicity of the populations of circumbinary and transition disks. I will conclude looking forward to the upcoming...
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Sreejita Das (European Southern Observatory)22/09/2025, 11:30
The dust mass budget of protoplanetary disks plays an important role in planet formation. However, ALMA surveys often underestimate disk masses as many disks have extended low surface-brightness regions at hundreds of au that fall below ALMA's sensitivity limits. This may contribute to the mass-budget problem where exoplanetary systems appear to be more massive than disks. In this talk, I will...
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Elena Viscardi (ESO)22/09/2025, 11:45
Dust plays a fundamental role in the formation of planets, acting as the primary building block from which planetary systems emerge. To understand the origins and diversity of the planetary systems observed throughout the galaxy, including our own Solar System, it is essential to investigate how micron-sized, amorphous dust grains found in the interstellar medium are transformed into the...
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Enrique Macias (ESO)22/09/2025, 13:30
The dust content of protoplanetary disks plays a crucial role in the planet formation process. The key ingredients are not only the total budget of solid mass and the dust particle size distribution, but also how these are distributed throughout the protoplanetary disk. Characterizing the dust surface density, particle properties, and size distribution within the disk and its substructures is,...
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Sebastian Stammler (LMU)22/09/2025, 13:45
High-resolution ALMA observations of protoplanetary disks commonly reveal multiple narrow rings. Surprisingly, many of these rings exhibit similar moderate optical depths (τ ≃ 0.2–0.5 at millimeter wavelengths), despite substantial variation in disk environments — a puzzling uniformity that hints at some underlying unknown effect regulating dust physics.
We propose that this “optical depth...
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Alexandros Ziampras (LMU Munich)22/09/2025, 14:00
Numerous protoplanetary disks exhibit shadows in scattered light observations. These shadows are typically cast by misaligned inner disks and are associated with observable structures in the outer disk such as bright arcs and spirals. Investigating the dynamics of the shadowed outer disk is therefore essential in understanding the formation and evolution of these structures. We carry out...
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Katharina Immer (ESO)22/09/2025, 14:15
The formation of high-mass stars remains one of the key open questions in astrophysics. While structures familiar from low-mass star formation such as outflows, jets, and rotating centroids have been observed in massive star-forming regions, detailed studies at spatial scales of a few hundred AU are still rare and limited to only a handful of sources.
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Recent ALMA observations of the high-mass... -
Giulia Ricciardi (ESO)22/09/2025, 14:30
Planet-forming disks observed by ALMA surveys often exhibit surprisingly faint continuum and CO emission, raising doubts about whether these disks contain enough material to account for the known exoplanet population. Despite this, the fainter end of the disk population - which shows compact, unresolved continuum emission and non-detections in CO isotopologues - has received little detailed...
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Pooneh Nazari (ESO)22/09/2025, 15:00
Recent observations by ALMA suggest that planets may begin forming much earlier in the lifecycle of stellar systems than previously thought, in the protostellar systems. These systems are abundant in icy and gaseous material which can contribute to the planetesimals forming there. I will present JWST results of the icy content of these systems, particularly multiple new molecular detections...
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Karina Mauco22/09/2025, 15:15
Given the variety of properties found in planetary systems in our Galaxy, we must analyse general disk and host star properties measured in a large statistical sample of systems at different evolutionary stages and environments. Disks in nearby regions evolve differently than disks in highly irradiated environments. Since the majority of (exo)planet host stars (including our Solar System) form...
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Jens Kammerer (ESO)22/09/2025, 15:30
Direct observations of substellar companions are ideally suited to study young giant planets and brown dwarfs during or shortly after their formation. As such, this unique class of objects provides valuable insights into planet formation processes and the imprints they leave on the chemical composition and atmospheric properties of young companions. However, the traditional population of...
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Alex Cridland (Universitäts-Sternwarte Munich (USM), LMU)22/09/2025, 15:45
We have long been interested in the chemical link between protoplanetary disks and planetary atmospheres. But this has largely been limited to the most abundant isotopes of elements like oxygen and carbon. More recent observational efforts have begun to identify the precence of less abundant isotopologues like $^{13}$CO in the atmospheres of giant planets and sub-stellar objects. Here I will...
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Surangkhana Rukdee (MPE)22/09/2025, 16:00
The high-energy environments of host stars can shape the chemistry of exoplanet atmospheres. In nearby benchmark systems, hosting rocky to sub-Neptunian planets, we focus on the impact on biosignature gases such as oxygen, methane, and carbon dioxide. With new data from Chandra, eROSITA and XMM-Newton, we study the X-ray flux variability on timescales of days to years. Using a Bayesian...
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22/09/2025, 16:15
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22/09/2025, 16:45
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