Calendar

Nov
22
Fri
Colloquium: Rixin Li (Host: Wladimir Lyra)
Nov 22 @ 3:15 pm – 4:15 pm
Colloquium: Rixin Li (Host: Wladimir Lyra) @ BX102

Simulating Planetesimal Formation in the Kuiper Belt and Beyond

Rixin Li, University of Arizona

A critical step in planet formation is to build super-km-sized planetesimals in protoplanetary disks. The origin and demographics of planetesimals are crucial to understanding the Solar System, circumstellar disks, and exoplanets. I will overview the current status of planetesimal formation theory. Specifically, I will present our recent simulations of planetesimal formation by the streaming instability, a mechanism to aerodynamically concentrate pebbles in protoplanetary disks. I will then discuss the connections between our numerical models and recent astronomical observations and Solar System explorations. I will explain why all planetesimals likely formed as binaries.

Dec
6
Fri
Colloquium: Elise Boera (Host: Kristian Finlator)
Dec 6 @ 3:15 pm – 4:15 pm
Colloquium: Elise Boera (Host: Kristian Finlator) @ BX102

Revealing reionization with the thermal history of the intergalactic medium

Elisa Boera, SISSA Trieste

During hydrogen reionization the UV radiation from the first luminous sources injected vast amount of energy into the intergalactic medium, photo-heating the gas to tens of thousands of degree Kelvin. This increase in temperature has left measurable `imprints’ in the thermal history of the cosmic gas: a peak in the temperature evolution at the mean density and a smoothing out of the gas in the physical space by the increased gas pressure following reionization (i.e. Jeans smoothing effect). The structures of the HI Lyman-alpha forest at high redshift are sensitive to both these effects and therefore represent a powerful tool to understand when and how reionization happened. I will present the most recent constraints on the thermal history of the intergalactic medium obtained using the Lyman-alpha forest flux power spectrum at z>5. I will show how these results can be used to obtain information on the timing and the sources of the reionization process and I will discuss their consistency with different possible reionization scenarios.
Feb
3
Mon
Galaxy group meeting
Feb 3 @ 2:00 pm – 3:00 pm
Feb
6
Thu
Colloquium: RESERVED
Feb 6 @ 3:15 pm – 4:15 pm
Colloquium: RESERVED @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

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Feb
11
Tue
Remote Colloquium: RESERVED
Feb 11 @ 3:00 pm – 4:00 pm
Remote Colloquium: RESERVED @ MH 85

Colloquium Title

Colloquium Speaker Name, Affiliation

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Feb
12
Wed
Remote Colloquium: RESERVED
Feb 12 @ 3:00 pm – 4:00 pm
Remote Colloquium: RESERVED @ MH 85

Colloquium Title

Colloquium Speaker Name, Affiliation

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Feb
13
Thu
Colloquium: RESERVED
Feb 13 @ 3:15 pm – 4:15 pm
Colloquium: RESERVED @ BX102

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Feb
17
Mon
Galaxy group meeting
Feb 17 @ 2:00 pm – 3:00 pm
Colloquium: RESERVED
Feb 17 @ 3:15 pm – 4:15 pm
Colloquium: RESERVED @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text

Feb
19
Wed
Remote Colloquium: RESERVED
Feb 19 @ 1:00 pm – 2:00 pm
Remote Colloquium: RESERVED @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text