-
Jan 22, 2025 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Dr. Karina MaucóAffiliation: ESOAbstract: Protoplanetary disks set the initial composition of future planetary systems. Comparing the chemistry of disks to the compositions of exoplanet atmospheres informs our understanding of the planet-formation process. This is the main focus of the ALMA Disk-Exoplanet C/Onnection (DECO) large program. It observed 80 disks across four star-forming regions sampling a range of stellar masses, disk sizes, and environments.
-
Jan 20, 2025 | 
academic.oup.com | Departamento de Astronomía |Universidad de Concepcion
Recent studies have found a striking positive correlation between the amount of dust obscuration and enhanced radio emission in quasi-stellar objects (QSOs). However, what causes this connection remains unclear. In this paper we analyse uGMRT Band-3 (400 MHz) and Band-4 (650 MHz) data of a sample of 38 1.0 < z 0.1 mag) are more likely to exhibit steep spectral slopes (α < −0.5; S ∝ να) than the non-dusty QSOs (E(B − V) < 0.1 mag), with fractions of 46±12 and 12±4 per cent, respectively.
-
Jan 15, 2025 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Dr. Florentin MillourAffiliation: Observatoire de la Côte d'AzurAbstract: For 5 years now, the new instrument of the Very Large Telescope Interferometer GRAVITY+ has been developed in Europe and recently installed in Chile, at the Paranal Observatory.
-
Jan 8, 2025 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Dr. Cristiano LongariniAffiliation: Cambridge UniversityAbstract: Protoplanetary discs are the link between stars and planet: they form with the star, and they are the environments where planet formation takes place. ALMA observations show that planet formation is ubiquitous, and occurs very early in the disc lifetime, when the disc is still massive. In such massive environments, gravitational instabilities are likely to occur, playing a crucial role in disc evolution.
-
Dec 11, 2024 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: María José MaureiraAffiliation: Max Planck Institute for Extraterrestrial PhysicsAbstract: 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.
-
Dec 4, 2024 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Ryan TrainorAffiliation: Franklin & Marshall CollegeAbstract: The “metallicity” of a galaxy—i.e., the total mass fraction of heavy elements—is a key tracer of the complex interactions of stars, gas, and black holes that regulate galaxy evolution. As such, measuring galaxy metallicities is a major goal of current galaxy surveys from the local Universe to the epoch of reionization. However, galaxy metallicities in the early Universe are challenging to measure and interpret for two reasons.
-
Nov 28, 2024 | 
academic.oup.com | Instituto de Astronomia |Universidad Diego Portales |Departamento de Astronomía |Universidad de Chile
We present the discoveries of NGTS-31b(=TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 days, 1.61 and 1.42 R , and 1.12 and 0.57 M , respectively. Both planets have an incident stellar flux significantly above the threshold where inflation occurs, with both planets showing signs of inflation.
-
Nov 27, 2024 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Magdalena HamelAffiliation: CAS, Swinburne University of TechnologyAbstract: The metal enrichment across the baryon cycle of galaxies is crucial for understanding galaxy evolution. Supernovae expel metal rich gas away from galaxies and inflows inject pristine gas. Simulations show that outflows are the main mechanism in redistributing metals and are key drivers of the chemical enrichment of galaxies and their circumgalactic medium.
-
Nov 24, 2024 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Paula Sánchez SáezAffiliation: European Southern Observatory (ESO)Abstract: Brightness variations of active galactic nuclei (AGNs) offer key insights into their physical emission mechanisms and related phenomena. These variations also provide us with an alternative way to identify AGN candidates that could be missed by more traditional selection techniques.
-
Nov 21, 2024 | 
ingenieria.uchile.cl | Departamento de Astronomía
Speaker: Dr. Gerardo Juan M. LunaAffiliation: UNAHUR/Conicet/ArgentinaAbstract: Binary systems that host an accreting white dwarf display a variety of phenomena in a broad range of wavelengths, either during quiescence or eruptive phases. In this talk I'll discuss the recent progress in our study of these objects with high energy instruments, in X-rays and Gamma-rays, focusing on those binaries that experienced some eruption in the last few years.
