July 31 Wed 15:30-16:30
NAOJ Science Colloquium
hybrid; Large Seminar Room in Subaru Building and Zoom
Aug 2 Fri 15:30-16:30
NAOJ Seminar
hybrid; Large Seminar Room in Subaru Building and Zoom
詳細は下記からご覧ください。
=============== July 31 Wed===============
Seminar: NAOJ Science Colloquium
Date and time: 2024 July 31 (Wed.), 15:30-16:30 JST
Place: the large seminar room / Zoom (hybrid)
Speaker: Jiaqing Bi
Affiliation: Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)/University of Toronto
Title: Where 3-dimensional analysis matters: dust distribution in protoplanetary disks under planet-disk interactions
Abstract:
Protoplanetary disks are the birthplaces of planets. However, these disks also
embed young planets, making them extremely difficult to detect. Substructures
within the disks, especially those observed in millimeter-wavelength dust thermal emissions, such as gaps and rings, have been used to suggest the presence of planets.
Nevertheless, planet-disk interactions are not the only mechanisms that can explain these features. Therefore, distinguishing substructures caused by planets from those of other origins is crucial for current planet-hunting efforts and understanding the planet formation process. In this talk, I will summarize our recent studies on dust dynamics under planet-disk interactions, utilizing three-dimensional numerical simulations.
Our findings show that incorporating the vertical dimension in planet-disk models reveals a wealth of dynamics, leading to possible characteristic features in observations.
Facilitator
-Name: Kazumasa Ono
-Comment: English
===============Aug 2 Fri==============
Campus：Mitaka
Seminar：NAOJ Seminar
Regularly Scheduled/Sporadic：Regular
Date and time：August 2, 2024 15:30-16:30
Place：Zoom/Large Seminar Room (hybrid)
Speaker：Dr. Toshihiro Fujii
Affiliation：Osaka Metropolitan University
Title：The 100-year endeavor for observing the Universe’s most energetic particles
Abstract: Clarifying origins and acceleration mechanisms of the most energetic
particles in the universe has been over-100-year endeavor, being one of the
most intriguing mysteries in an interdisciplinary research among
astroparticle physics, high-energy physics and nuclear physics. Since
ultra-high energy cosmic rays (UHECRs) are deflected less strongly by the
Galactic and extra-galactic magnetic fields due to their enormous kinetic
energies, their arrival directions would be correlated with their origins. A
next-generation “astronomy” using UHECRs is hence a potentially viable
probe to disentangle mysteries of extremely energetic phenomena in the
nearby universe.
In my talk, I will give an introduction of cosmic-ray physics, detection
techniques, history over 100 years, the latest results of the Telescope
Array experiment and ongoing upgrades, including the detection of an
extremely high-energy cosmic ray, dubbed “Amaterasu” particle. I will share
a new interdisciplinary project for combining the Subaru telescope and
cosmic ray detectors to decipher details of extensive air showers, dubbed
Air-shower Lensing Observatory at High Altitude (ALOHA).
Facilitator
-Name：Jun-Ichi Morino