KICP Seminars & Colloquia, Current and Future

Seminar schedule for Current (Summer 2016) & Future Quarters
June 27, 2016
Astronomy Special Seminar
Mitsunori Araki
Tokyo University of Science, Japan
Detection of CH3CN in a Diffuse Cloud by Hot Axis Effect indicating its coexistence with C60+, a carrier of Diffuse Interstellar Bands   [Abstract]
July 6, 2016
Open Group seminar
Rhondale Tso
Caltech
Modeling the Propagation & Polarization of Gravitational Waves to Test GR   [Abstract]
July 6, 2016
Open Group seminar
Oleg Ruchayskiy
Niels Bohr Institute
MHD description of chiral relativistic plasma   [Abstract]
July 18, 2016
Astronomy Special Seminar
Mario Flock
JPL/Caltech
Radiation hydrodynamical models of the inner rim in protoplanetary disks   [Abstract]
October 5, 2016
Astronomy Colloquium
Alicia Soderberg
Harvard
TBA
October 19, 2016
Astronomy Colloquium
Zhi-Yun Li
Virginia
TBA
November 2, 2016
Astronomy Colloquium
Feryal Ozel
Arizona
TBA
November 16, 2016
Astronomy Colloquium
Richard Townsend
Wisconsin
TBA
November 30, 2016
Astronomy Colloquium
Konstantin Batygin
Caltech
TBA
 
WEDNESDAY COLLOQUIA
KICP Wednesday Colloquia: Unless otherwise noted, all talks are held in ERC 161 at 3:30 PM on Wednesdays. A reception will be held in the ERC 161 following the talk.


 
FRIDAY NOON SEMINARS
KICP Friday noon seminar: Unless otherwise noted, all talks are held in ERC 401 at Noon on Fridays.


 
SPECIAL SEMINARS


 
OPEN GROUP SEMINARS

  • July 6, 2016 | 12:00 PM | ERC 401
    Modeling the Propagation & Polarization of Gravitational Waves to Test GR
    Rhondale Tso, Caltech

    Abstract: To test General Relativity (GR) through gravitational wave (GW) detections the primary methods are: 1) modifying the source dynamics to account for corrections to GR, 2) modifying the propagation and dispersive properties of the GW. Often one can disentangle the latter from the former to investigate each independently. Our work looks at a new generic modification to the dispersion of GWs, irrespective of the source, to account for parametrized corrections to GR. This new model-independent approach encapsulates all previous studies and provides a roadmap for additional theories. In this talk the added features will be discussed, including frequency dependent dissipation, preferred space directions coupled to dissipation, and adjustments to the GW's polarization content during its time of flight. An overview of data analysis and potential pipeline implementation will be discussed.
  • July 6, 2016 | 2:00 PM | ERC 401
    MHD description of chiral relativistic plasma
    Oleg Ruchayskiy, Niels Bohr Institute

    In systems of relativistic particles, an electric current, parallel to the magnetic field, can flow. This phenomenon, known as "chiral magnetic effect", changes the dynamics of magnetized plasmas in an essential way. I will present proper equations of "chiral relativistic magnetohydrodynamics" and discuss their relevance for generation and evolution of cosmological magnetic fields in the electroweak epoch and for other relativistic systems.

 
THURSDAY LUNCH DISCUSSIONS
KICP's Thunch: KICP Cosmology Lunch (Thunch) Weekly on Thursdays, Noon, ERC 401A.

Please join us for an informal lunch discussion, led by KICP fellows, of recent news and papers in cosmology. Topics range from experiment and observations to theory in all areas of KICP science. To submit or view papers for this week's Thunch please visit the Thunch website.


 
ASTRONOMY COLLOQUIA
Colloquia of the Department of Astronomy & Astrophysics: Unless otherwise noted, all talks are held in ERC 161 at 3:30 PM on Wednesdays. A reception will be held in Astro Lounge (ERC 501) following the talk.

  • October 5, 2016 | 3:30 PM | ERC 161
    TBA
    Alicia Soderberg, Harvard
    Note: Refreshments served at 4:30 PM, Astro Lounge
  • October 19, 2016 | 3:30 PM | ERC 161
    TBA
    Zhi-Yun Li, Virginia
    Note: Refreshments served at 4:30 PM, Astro Lounge
  • November 2, 2016 | 3:30 PM | ERC 161
    TBA
    Feryal Ozel, Arizona
    Note: Refreshments served at 4:30 PM, Astro Lounge
  • November 16, 2016 | 3:30 PM | ERC 161
    TBA
    Richard Townsend, Wisconsin
    Note: Refreshments served at 4:30 PM, Astro Lounge
  • November 30, 2016 | 3:30 PM | ERC 161
    TBA
    Konstantin Batygin, Caltech
    Note: Refreshments served at 4:30 PM, Astro Lounge

 
ASTRONOMY TUESDAY SEMINARS


 
ASTRONOMY SPECIAL SEMINARS

  • June 27, 2016 | 12:00 PM | ERC 545
    Detection of CH3CN in a Diffuse Cloud by Hot Axis Effect indicating its coexistence with C60+, a carrier of Diffuse Interstellar Bands
    Mitsunori Araki, Tokyo University of Science, Japan

    Diffuse interstellar bands (DIBs) are optical absorption lines by molecules in diffuse cloud. Initially observed more than 100 years ago, they still remain the longest standing unsolved problem in spectroscopy and astrochemistry, although five DIBs have recently been identified as due to fullerene ion C60+. Identifications of DIBs are important because they can give us information for chemical composition in space. To identify carrier molecules of DIBs we have measured DIB candidate molecules produced in the laboratory to compare their absorption spectra with astronomically observed DIB spectra. In this talk, I first present our latest results on the search for the thiophenoxy radical C6H5S by using our cavity ringdown spectrometer. I then present a new insight into diffuse clouds. Molecules in diffuse clouds are collisionally heated and radiatively cooled. Due to the spectroscopic selection rules, acetonitrile CH3CN is cooled well for the end-over-end rotation but is not cooled for rotation around its molecular axis. We made a model of this peculiar rotation as "Hot Axis Effect." Based on this model, we estimated a rotational absorption spectrum of CH3CN in the radio frequency region. By using Nobeyama 45 m radio telescope, the absorption line was detected in the diffuse cloud in front of Orion molecular cloud. Absorption lines of the fullerene have also been reported in this diffuse cloud. Thus we found that CH3CN coexists with C60+ in this diffuse cloud.
  • July 18, 2016 | 2:00 PM | ERC 545
    Radiation hydrodynamical models of the inner rim in protoplanetary disks
    Mario Flock, JPL/Caltech

    Many stars host planets orbiting within one astronomical unit (AU). These close planets' origins are a mystery that motivates investigating protoplanetary disks' central regions. A key factor governing the conditions near the star is the silicate sublimation front, which largely determines where the starlight is absorbed, and which is often called the inner rim. We present the first radiation hydrodynamical modeling of the sublimation front in the disks around the young intermediate-mass stars called Herbig Ae stars. The models are axisymmetric, and include starlight heating, silicate grains sublimating and condensing to equilibrium at the local, time-dependent temperature and density, and accretion stresses parametrizing the results of MHD magneto rotational turbulence models. The results show for the first time the dynamical stability of the rim. Passing the model disks into Monte Carlo radiative transfer calculations allows us to directly compare with observational constraints. The inner rim has a substantial radial extent, corresponding to several disk scale heights. A pressure maximum develops at the position of thermal ionization at temperatures about 1000 K. The pressure maximum is capable of halting solid pebbles' radial drift and concentrating them in a zone where temperatures are sufficiently high for annealing to form crystalline silicates.