Speaker

Sabrina Stierwalt

Title

The Baryon Cycle in Dwarf-Dwarf Mergers: Fueling Hierarchical Assembly (Occidental College)

Abstract

Speaker

Rebecca Bowler

Title

Galaxy evolution at high-redshifts (University of Manchester)

Abstract

Speaker

Andrea Buccino

Title

Stellar Activity Cycles (Universidad de Buenos Aires)

Abstract

Speaker

Sebastian Hoenig

Title

Tori, disks, and winds: a fresh look at the dusty environment of AGN (University of Southampton)

Abstract

Speaker

Elisa Maria Alessi

Title

The Solar Radiation Pressure - Oblateness Coupled Perturbation as an Enabler for Passive end-of-life Solutions and Long-term Sustainability of the Circumterrestrial Environment (Istituto di Matematica Applicata e Tecnologie Informatiche)

Abstract

Speaker

Danielle Leonard

Title

Understanding intrinsic galaxy alignments for weak lensing cosmology (Newcastle University)

Abstract

Speaker

Susana Barros

Title

Tidal deformation and tidal decay of WASP-103c (Instituto de Astrofísica e Ciências do Espaço)

Abstract

Tidal forces between short-period planets and their host stars are extreme. These lead to the deformation of the planet and the shrinkage of the planet’s orbit. Using the new ESA mission CHEOPS we are attempting to measure both these effects for a sample of exoplanets. Measuring the tidal deformation of the planet would allow us to estimate the second degree fluid Love number and gain insight into the planet\\\'s internal structure. Measuring the tidal decay timescale would allow us to estimate the stellar tidal quality factor, which is key to constraining stellar physics. WASP-103 was our first since it had the largest estimated signature of the tidal deformation. I will present the first detection of the tidal deformation of a planet directly from its light curve. This allowed us to measure the Love number of WASP-103b. We also found a hint that the orbital period of WASP-103b is increasing contrary to what is expected from tidal decay. I will explore the scenarios that could explain these observations.

Speaker

Somayeh Khakpash

Title

Microlensing in the era of large surveys (University of Delaware)

Abstract

Microlensing can be used to discover exoplanets of a wide range of masses with orbits beyond ~1 AU and even free-floating planets. The Roman space mission will use microlensing to discover approximately ~1400 planets by monitoring ~100 million stars to find ~50000 microlensing events. Modeling each microlensing event, especially the ones involving two or more lenses, is typically complicated and time-consuming, and analyzing thousands of microlensing events is possibly infeasible using the traditional methods. In this presentation, I will introduce two large surveys including the Roman space mission and the Rubin LSST, and discuss their synergies and the tools under development to utilize the uniqueness of these two surveys.

Speaker

Antonia Sierra Villarreal

Title

Extreme Scale Image Simulation Workflows for LSST DESC (Argonne National Laboratory)

Abstract

Speaker

Véronique Buat

Title

Dust and stars: an unavoidable and complex interplay (Laboratoire d’Astrophysique de Marseille)

Abstract

Speaker

Laure Ciesla

Title

Rewind: recovering the star formation histories and past properties of galaxies (Laboratoire d’Astrophysique de Marseille)

Abstract

Speaker

Ummi Abbas

Title

Differential Astrometry with Gaia (INAF - Osservatorio Astronomico di Torino)

Abstract

Speaker

Ana Carolina Lourenço

Title

Are there more jellyfish galaxies in merging clusters? (University of Valparaiso)

Abstract

Speaker

Raffaella Margutti

Title

Transient Sky in the New Era of Time Domain Multi-Messenger Investigations (University of California Berkeley)

Abstract

Astronomical transients are signposts of catastrophic events in space, including the most extreme stellar deaths, stellar tidal disruptions by supermassive black holes, and mergers of compact objects. Thanks to new and improved observational facilities we can now sample the night sky with unprecedented temporal cadence and sensitivity across the electromagnetic spectrum and beyond. This effort has led to the discovery of new types of astronomical transients, revolutionized our understanding of phenomena that we thought we already knew, and enabled the first insights into the physics of neutron star mergers with gravitational waves and light. In this talk I will review some very recent developments that resulted from our capability to acquire a truly panchromatic view of transient astrophysical phenomena. I will focus on two key areas of ignorance in the field: (i) What are the progenitors of stellar explosions and what happens in the last centuries before death? (ii) What is the nature of the compact objects produced by these explosions and what happens when compact objects merge? The unique combination of Discovery Power (guaranteed by planned transient surveys like LSST, combined with efforts in the realm of artificial intelligence) and Understanding (enabled by multi-messenger observations) is what positions time-domain astrophysics for major advances in the near future.

Speaker

Niel Brandt

Title

A Good Hard Look at Cosmic Supermassive Black-Hole Growth (The Pennsylvania State University )

Abstract

The 7 Ms Chandra X-ray Observatory exposure on the Chandra Deep Field-South (CDF-S) has provided the most sensitive extragalactic X-ray survey by a wide margin. About 1050 X-ray sources have been detected, primarily distant active galactic nuclei (AGNs) and starburst/normal galaxies. The unmatched deep multiwavelength coverage for these sources allows superb follow-up investigations, revealing the details of supermassive black-hole growth over most of cosmic time. I will briefly describe the sources in the 7 Ms CDF-S and highlight some exciting science results. The latter will include (1) measurements of long-term black-hole growth informed by galaxy morphological and physical measurements; (2) constraints upon black-hole growth in the first galaxies as revealed by direct detection and stacking; and (3) the discovery of representatives of a new population of faint, fast X-ray transient sources. Finally, I will discuss some future prospects for X-ray surveys of AGNs in the distant universe, including the recently completed 5 Ms XMM-SERVS survey of the LSST Deep Drilling Fields and new X-ray missions.

Speaker

Kyle Dawson

Title

The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory (University of Utah)

Abstract

The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) concluded observations of the cosmic distance scale and the growth of structure in February, 2019. The three dimensional clustering in all samples from the Sloan Digital Sky Survey (SDSS) was used to make 15 distinct, high precision measurements of Baryon Acoustic Oscillations (BAO) to an effective redshift z<2.4 and six measurements of redshift space distortions (RSD) to z<1.5. With this redshift coverage and sensitivity, the SDSS experiment is unparalleled in its ability to explore models of dark energy. Using available cosmological samples, we provide new constraints on the cosmological model with an emphasis on the role of the final BAO and RSD clustering measurements in advancing the cosmological model. In this talk, I will give a brief overview of the BAO and RSD measurements and present the highlights of the advances in modeling dark energy, the local expansion rate, tests of general relativity, neutrino masses, and the overall cosmological model.

Speaker

Michelle Lochner

Title

Anomaly Detection in Astronomical Data using Machine Learning (University of the Western Cape)

Abstract

The next generation of telescopes such as the SKA and the Vera C. Rubin Observatory will produce enormous data sets, far too large for traditional analysis techniques. Machine learning has proven invaluable in handling large data volumes and automating many tasks traditionally done by human scientists. In this talk, I will discuss how machine learning for anomaly detection can help automate the process of locating unusual astronomical objects in large datasets thus enabling new cosmic discoveries. I will introduce Astronomaly, a general purpose framework for anomaly detection in astronomical data using active learning and overview some recent results.