Past Events

  • 2019 Nov 05

    ITC Seminar - Kareem El-Badry (Berkeley)

    12:00pm to 1:00pm

    Location: 

    Phillips

    Wide binaries as dynamical probes

    Abstract: The orbits of wide binary stars are fragile and are thus sensitive probes of the dynamical history of Galactic stellar populations. The Gaia mission has recently revolutionized the wide binary field, making it straightforward to assemble large, homogenous, and pure catalogs of binaries with a well-understood selection function. I will discuss recent discoveries enabled by these data, focusing in particular on an unexpected excess population of equal-mass "twin" binaries at wide separations that...

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  • 2019 Oct 31

    ITC Luncheon

    12:30pm to 1:30pm

    Location: 

    Phillips
    Michelle Ntampaka (ITC)   “A Hybrid Deep Learning Approach to Cosmological Constraints From Galaxy Redshift Surveys”

    Niharika Sravan (Purdue)   "Real-time Value-Driven Data Augmentation in the era of LSST”

    Zoltan Haiman (Columbia)   "Making a supermassive star by stellar bombardment”

    Ellen Price (Harvard)    “Chemistry Along Accretion Streams in Protoplanetary Disks”
  • 2019 Oct 31

    ITC Colloquium - Tom Millar (QUB)

    11:00am to 12:00pm

    Location: 

    Pratt

    Light in the Darkness: The Role of UV Photons in the Circumstellar Envelopes of AGB Stars

     

    Abstract: As well as forming silicates and carbonaceous dust grains, the circumstellar envelopes (CSEs) of AGB stars are host to nearly 100 molecular species. The traditional paradigm – that these result from the interaction of a spherically-symmetric expanding wind with interstellar photons – is under strain from recent observations that show ‘unexpected’ molecules in the hot, inner layers of the CSE.  I will discuss some recent observations that indicate mass-loss...

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  • 2019 Oct 29

    ITC Seminar - Alexa Villaume (UCSC)

    12:00pm to 1:00pm

    Location: 

    Phillips

    Galactic Archeology of the Brightest Cluster Galaxy M87

     

    The galactocentric radial metallicity gradients of GC systems can be used to probe the assembly histories of galaxies but doing so is complicated by: 1.) a GC system is an aggregate population of several (or many) different subpopulations of different origins, and 2.) computing the gradients with respect to projected galactocentric distances can artificially flatten the gradient. I describe a hierarchical statistical framework measure the radial metallically gradients of the GC subpopulations and its...

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  • 2019 Oct 24

    ITC Luncheon

    12:30pm to 1:30pm

    Location: 

    Phillips
    Tom McLeish (University of York)  “Interdisciplinary Investigation of a Medieval Mathematical Cosmology: the 13th century Big Bang Theory”

    Joel Parriott (AAS)  "Why You Should Care About OCO, NDD, BCA and Other Federal Budget Arcana”

    Michela Mapelli (INAF Padova)  “Supernova-driven extreme mass ratio inspirals”

    Hamsa Padmanabhan (CITA)  “Going beyond LCDM with HI intensity mapping”

  • 2019 Oct 24

    ITC Colloquium - Michela Mapelli (INAF Padova)

    11:00am to 12:00pm

    Location: 

    Pratt

    Black hole demography in the era of gravitational-wave astronomy

     

    The era of gravitational-wave astronomy has just begun and the formation channels of binary black holes (BBHs) are one of its most debated questions. In my talk, I will discuss what we learned and what we still do not understand about the formation of black holes from the collapse of massive stars, focusing on the impact of pair instability and stellar rotation. Based on novel population-synthesis calculations, I will show that massive binary stars can evolve into BBHs with total mass up to ~130...

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  • 2019 Oct 17

    ITC Luncheon

    12:30pm to 1:30pm

    Location: 

    Phillips
    Ashley Villar (CfA)   "A Semisupervised Approach to Supernova Classification and Anomaly Detection”

    Grant Kennedy (Warwick)     “A circumbinary protoplanetary disk in a polar configuration”

    Ruth Angus (AMNH)     "Stellar rotation with TESS”

    Alain Dupas    “Space macroengineering and the future of humankind”

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