Past Events

  • 2021 Feb 18

    ITC Colloquium - Maya Fishbach (Northwestern)

    11:00am to 12:00pm

    Location: 

    Zoom
    "LIGO-Virgo’s Biggest Black Holes and the Mass Gap"


    Abstract: Models for black hole formation from stellar evolution robustly predict the existence of
    a pair-instability supernova mass gap in the range ~50 to ~120 solar masses. The binary
    black holes of LIGO-Virgo's first two observing runs supported this prediction, showing evidence
    for a dearth of component black hole masses above 45 solar masses. Meanwhile, among the
    30+ new observations from the third observing run, there are several black holes that appear to
    sit above the 45 solar mass limit. I will discuss how...

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  • 2021 Feb 11

    ITC Colloquium - Clara Sousa-Silva (MIT)

    11:00am to 12:00pm

    Location: 

    Zoom

    "Finding an Alien Biosphere with Computational Chemistry"

    At the edge of our present scientific frontier lies the question: “Can we identify the signs of life on an exoplanet?”. Establishing whether a planet is habitable, or inhabited, relies both on the observation of an exoplanet atmosphere and, crucially, its subsequent interpretation. This interpretation requires knowledge of the spectral behavior of every significant atmospheric molecule. However, though thousands of molecular candidates can contribute towards the spectrum of an atmosphere,...

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  • 2021 Feb 04

    ITC Colloquium - Matteo Cantiello (Flatiron)

    11:00am to 12:00pm

    Location: 

    Zoom
    "Stellar Evolution in AGN Disks"

    I will discuss the exotic evolution of stars embedded in AGN disks, showing that in sufficiently dense and cold regions rapid accretion can lead to the formation of massive and very massive objects. These stars undergo core-collapse, leave behind compact remnants and contribute to polluting the disk with heavy elements. I will show that AGN stars can have a profound impact on the evolution of AGN metallicities, as well as the production of gravitational waves sources observed by LIGO-Virgo. AGN stars can also lead to the formation of short and... Read more about ITC Colloquium - Matteo Cantiello (Flatiron)
  • 2021 Jan 28

    ITC Colloquium - Anthony Brown (Leiden)

    11:00am to 12:00pm

    Location: 

    Zoom
    "Gaia Early Data Release 3: First science results"

    I will present a brief summary of Gaia EDR3 accompanied by highlights from the early science results based on this data release.
  • 2020 Dec 03

    ITC Colloquium - Gwen Rudie (Carnegie) and Priya Natarajan (Yale)

    11:00am to 12:00pm

    Location: 

    Zoom
    1. Gwen Rudie (Carnegie) "The Circumgalactic Medium of Star-Forming Galaxies during Cosmic Noon"

      The exchange of baryons between galaxies and their surrounding intergalactic medium (IGM) is a crucial but poorly-constrained aspect of galaxy formation and evolution. I will present results from the Keck Baryonic Structure Survey (KBSS), a unique spectroscopic survey designed to explore both the physical properties of high-redshift galaxies and the connection between these galaxies and their surrounding intergalactic baryons. The KBSS is optimized to trace the cosmic peak...

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  • 2020 Nov 19

    ITC Colloquium - Annalisa Pillepich (MPIA-HD)

    11:00am to 12:00pm

    Location: 

    Zoom
    1. Annalisa Pillepich (MPIA-HD) "The many diverse manifestations of supermassive black-hole feedback"

      Feedback from super massive black holes is commonly invoked in state-of-the-art large-scale cosmological galaxy simulations to halt star formation in massive galaxies. In fact, no other mechanism so far has been shown to be capable of returning entire populations of simulated massive quenched galaxies that are consistent with the observed red sequence and quenched fractions. In this talk, I will use the IllustrisTNG cosmological simulations of galaxies to gain insights and...
    Read more about ITC Colloquium - Annalisa Pillepich (MPIA-HD)
  • 2020 Nov 12

    ITC Colloquium - Bence Kocsis (Oxford) and Carme Gallart (IAC)

    11:00am to 12:00pm

    Location: 

    Zoom
    1. Bence Kocsis (Oxford)  "On the AGN Origin of Gravitational Wave Sources observed by LIGO/VIRGO"

      With the detection of gravitational waves emitted during black hole and neutron star mergers, LIGO has recently opened the field of gravitational wave astrophysics. In this talk I will review the astrophysical processes that may be responsible for the formation of the observed events. The event rate distribution with mass, spins, eccentricity and redshift may be used to discriminate among different processes that lead to black hole mergers. I will show that the standard...

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  • 2020 Nov 05

    ITC Colloquium - Daniella Bardalez Gagliuffi (AMNH) and Evan Bauer (CfA)

    11:00am to 12:00pm

    Location: 

    Zoom

    Daniella Bardalez Gagliuffi (AMNH)  "System architectures as fossils of brown dwarf and giant planet formation"

    Brown dwarfs and giant planets share many similarities in their physical properties and atmospheric dynamics, but the most fundamental difference between these two types of objects is the formation pathway that led to their creation. The key to differentiating between formation pathways may lie in their chemical compositions. Recent discoveries have unveiled a number of systems with substellar companions in orbital configurations that are challenging to...

    Read more about ITC Colloquium - Daniella Bardalez Gagliuffi (AMNH) and Evan Bauer (CfA)
  • 2020 Oct 29

    ITC Colloquium - Wren Suess (Berkeley) and Jens Chluba (U Manchester)

    11:00am to 12:00pm

    Location: 

    Zoom
    1. Wren Suess (Berkeley) "The growth & transformation of galaxies across cosmic time"

      Deep surveys have allowed us to chart the evolution of galaxies from billions of years ago through to the present day with unprecedented precision. We’ve learned that the properties of both star-forming and quiescent galaxies— including stellar masses, structures, star formation rates, gas content, and kinematics— change dramatically with redshift. Despite this progress, several key questions remain unsolved in our current view of galaxy evolution. We still don’t understand how...

    Read more about ITC Colloquium - Wren Suess (Berkeley) and Jens Chluba (U Manchester)
  • 2020 Oct 22

    ITC Colloquium - Jennifer Andrews (Arizona) and Diana Powell (UCSC)

    11:00am to 12:00pm

    Location: 

    Zoom
    1. Jennifer Andrews (Arizona)  "Supernova Imposters and the Eruptions of Massive Stars"

      Existing in the magnitude space between traditional supernovae (SNe) and classical novae lies a zoo of explosive and eruptive transients with maximum absolute magnitudes of roughly -10<MV<-15. Traditionally interpreted as giant luminous blue variable (LBV) eruptions these often dubbed “SN imposters” likely arise from a variety of initial stellar masses and are caused by physical mechanisms ranging from instabilities in nuclear burning as the object evolves off the main sequence...
    Read more about ITC Colloquium - Jennifer Andrews (Arizona) and Diana Powell (UCSC)

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