Events Archive

TAC Seminar

Mon, Apr 6, 2015 at 12:00 pm

131A Campbell Hall

Renyue Cen (Princeton)

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Total Lunar Eclipse - Saturday, April 4th

Sat, Apr 4, 2015, 3:15 am to 6:44 am

Space

From Alex Filippenko: There will be a lunar eclipse visible from much of North America before sunrise on the morning of Saturday, April 4 (this is, tonight -- Friday night). The Moon will start entering Earth's dark shadow ("umbra") at 3:15 am PDT and it will exit at 6:44 am PDT, just before sunrise (around 6:50 am PDT); totality will be at 4:48-5:03 am PDT, lasting only 5 …

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Testing General Relativity with the Event Horizon Telescope

Thu, Apr 2, 2015 at 4:00 pm

1 LeConte Hall

Dimitrios Psaltis (University of Arizona)

The Event Horizon Telescope will generate the first images of the shadows of the black holes in the Milky Way and in M87. The observed mm photons will have originated in two of the strongest gravitational fields found in the Universe, encoding during their travel to the Earth the properties of the black-hole spacetimes. In this talk, I will discuss the prospect of performing a new tests of …

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Department Lunch 4/2

Thu, Apr 2, 2015 at 12:30 pm

131 Campbell Hall

Kazumi Kashiyama (UC Berkeley)
Daniel Lecoanet (UC Berkeley)
Dimitrios Psaltis (University of Arizona)

Kazumi Kashiyama (UC Berkeley) "Supermassive star formation via high-velocity collisions of protogalaxies" Daniel Lecoanet (UC Berkeley) "Kelvin-Helmholtz Instability: A Code Comparison" Dimitrios Psaltis (University of Arizona) “Linking Tests of Gravity On All Scales: from the Strong-Field Regime to Cosmology”

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How the large-scale Lyman-alpha forest will tell us about the galaxy luminosity function

Tue, Mar 31, 2015 at 1:00 pm

131A Campbell Hall

Andrew Pontzen, UCL

I will introduce a surprising relationship between the Lyman-alpha forest large-scale power spectrum and the luminosity function of galaxies and quasars [arXiv 1402.0506]. The forest is generally assumed to be a tracer of total matter on large scales but I will show how the assumed link between the dark and observable universe is substantially modified by radiative transfer effects. Future …

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Extreme Exoplanetary Systems: Hot Jupiters, Star-Disk-Binary Interactions and Circumbinary Planets

Mon, Mar 30, 2015 at 12:00 pm

131A Campbell Hall

Dong Lai (Cornell)

Observations over the last decade have revealed exoplanetary systems that are completely different from our own Solar System. These extreme planetary systems are changing our view of planetary formation. I will focus on hot Jupiters, giant planets in close orbits around their host stars (period about 5 days). Many hot Jupiter systems are found to have highly misaligned orbital axes relative to …

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The Increasing Complexity of Exoplanet Atmospheres

Thu, Mar 19, 2015

1 LeConte Hall

Emily Rauscher (University of Michigan)

 While there are now many types of exoplanets that have been discovered, the "hot Jupiter" class remains a focus for observers and theorists alike. This partly because these are inherently interesting objects, completely unlike anything in our solar system, but also because these are the best targets for atmospheric characterization. The atmospheric properties of bright …

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Department Lunch Talk

Thu, Mar 12, 2015 at 12:30 pm

131 Campbell Hall

Dick McCray (UC Berkeley)
Mike McCourt (Harvard)
Ryan Trainor (UC Berkeley)

Dick McCray (UC Berkeley): “SN1987A environmental impact” Mike McCourt (Harvard): "Going with the flow: using gas clouds to probe the accretion flow feeding Sgr A∗" Ryan Trainor (UC Berkeley): "The Escape of Gas and Photons from Faint Galaxies”

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Leveraging the Power of a Planet Population: Compositions, Mass-Radius Relation, and Host Star Multiplicity of Kepler's Super-Earths

Wed, Mar 11, 2015 at 3:00 pm

131A Campbell Hall

Angie Wolfgang (UCSC)

 The Kepler Mission has found thousands of planetary candidates with radii between 1 and 4 times that of Earth. These planets have no analogues in our Solar System, providing a potentially revolutionary opportunity to assess planet formation and evolution processes for a new planetary population. By coupling theoretical work with sophisticated statistical modeling, we place quantitative …

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Earth-size Exoplanets

Thu, Feb 26, 2015 at 4:00 pm

1 LeConte Hall

Andrew Howard (IfA)

 Earth-size exoplanets and their slightly larger ‘super-Earth’ cousins are the most abundant planets orbiting close to Sun-like stars. These planets have diverse physical compositions, unusual atmospheres, and poorly understood origins. My talk will trace the discovery and early characterization of these small worlds through Doppler surveys, the Kepler mission, and atmospheric …

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Department Lunch 2/26

Thu, Feb 26, 2015 at 12:30 pm

131 Campbell Hall

Sanch Borthakur (UC Berkeley)
Isaac Shivvers (UC Berkeley)
Tim Davis (Hertfordshire)

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Cosmic Neutrino Wakes

Tue, Feb 24, 2015 at 1:10 pm

131A Campbell Hall

Ue Li Pen (CITA)

We present a neutrino-dark matter relative motion effect, which leads to dipolar wakes around dark matter halos, an dipole correlation anisotropy, and other potentially observable outcomes. We present recent attempts to simulate this non-linear effect. 

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Engines, Lighthouses, and Laboratories: Massive Stars Across the Cosmos

Emily Levesque Colloquium

Mon, Feb 23, 2015 at 1:30 pm

131A Campbell Hall

Emily Levesque (University of Colorado, Boulder)

Massive stars are vital building blocks in our universe, with applications as astrophysical tools that span a broad range of subfields. The radiative signatures of star-forming galaxies are powered by their massive stellar populations. Transient phenomena act as observational beacons, ranging from local non-terminal events signaling the death throes of extreme massive stars to long-duration …

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What drives the evolution of the Milky Way’s disk?

Thu, Feb 19, 2015 at 4:00 pm

1 LeConte Hall

Jo Bovy (IAS)

Observations of the structure and dynamics of different stellar populations in the Milky Way's disk provide a unique perspective on disk formation, evolution, and dynamics. I will review our current knowledge of the chemo-orbital structure of the disk. I will then discuss new measurements of the kinematics and chemistry of intermediate-age stars over a large part of the Galactic disk from the …

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Department Lunch 2/19

Thu, Feb 19, 2015 at 12:30 pm

131 Campbell Hall

Dick Plambeck (UC Berkeley)
Jon Mauerhan (UC Berkeley)
Alexander Kaurov (U. of Chicago)

Dick Plambeck (UC Berkeley): "Probing the Parsec-scale Accretion Flow of 3C 84 with Millimeter Wavelength Polarimetry" Alexander Tchekovskoy (UC Berkeley) - "What Makes Astrophysical Jets Dance and Why Should We Care?" Alexander Kaurov (U. Chicago) - "Analytical models of reionization in the service of numerical simulations"

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