July 9 Tue 10:00-11:30
太陽系小天体セミナー (Solar System Minor Body Seminar)
Zoom
July 10 Wed 10:30-12:00
SOKENDAI Colloquium
hybrid; Large Seminar Room in Subaru Building and Zoom
July 10 Wed 15:30-16:30
NAOJ Science Colloquium
hybrid; Large Seminar Room in Subaru Building and Zoom
July 11 Thu 14:00-
Visitor’s Talk
hybrid; Insei Seminar Room in Subaru Building and Zoom
July 12 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 9 Tue===============
キャンパス：三鷹
セミナー名：太陽系小天体セミナー (Solar System Minor Body Seminar)
定例・臨時の別：定例
日時： 7月 9日（火曜日）10時00分～11時30分
場所：zoom
講演者：橘省吾 所属: 東京大学
タイトル: 小惑星リュウグウ・べヌーサンプルから考える太陽系の起源と進化
Abstract:
「はやぶさ2」が持ち帰ったC型小惑星リュウグウやOSIRIS-REx が 持ち帰ったB型小惑星ベヌーの分析結果を通して，見えてきた太陽系や 小惑星の起源や進化について，皆さんと議論できればと考えております．
世話人の連絡先
-名前：渡部潤一
備考：zoomでの参加
=============== July 10 Wed===============
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Scheduled
Date and time：July 10 10:30-12:00
Place：Large Seminar Room in Subaru Building and Zoom
Speaker：Kyosuke Sato
Affiliation：SOKENDAI 3rd year (D1) (Supervisor:Sakurako Okamoto, Masayuki Tanaka, Miho Ishigaki)
Title：Study of the Formation Mechanism of Ursa Minor Dwarf Spheroidal
Galaxy using Subaru/HSC Wide Field Data
Speaker：Shun Ishigami
Affiliation：SOKENDAI 4th year (D2) (Supervisor:Hirohisa Hara, Yukio Katsukawa, Masahito Kubo)
Title：Review of “Solar coronal heating from small-scale magnetic braids (Chitta et al. 2022)”
Facilitator
-Name：Yoshiaki Sato
Comment：Language: English
===============July 10 Wed==============
Campus: Mitaka
Seminar: NAOJ Science Colloquium
Date and time: 2024 July 10 (Wed.), 15:30-16:30 JST
Place: the large seminar room / Zoom (hybrid)
Speaker: Hajime Fukushima
Affiliation: University of Tsukuba
Title: Radiation hydrodynamics simulations of massive star cluster formation
Abstract:
Globular clusters (GCs) are believed to form in early galaxies, but the formation mechanism of GCs are still debated. In the star cluster formation, radiative feedback hampers star formation and increase of stellar density. Hence, the stellar feedback is a key factor in determination of star cluster properties. In this talk, I will review the star cluster formation and star formation quenching mechanisms, and introduce our recent simulations of massive star cluster formation and metal enrichment in the GC formation.
Facilitator
-Name: Nanase Harada
Comment: English
===============July 11 Thu==============
Campus：Mitaka
Seminar：Visitor’s Talk
Regularly Scheduled/Sporadic：Sporadic
Date and time：July 11th (Thu) 14:00
On-site venue: Graduate student seminar room (院生セミナー室) in the Subaru building, NAOJ Mitaka
Speaker：Dr. Prasanta Gorai
Affiliation：University of Oslo
Title：Insights into Chemical Complexity and Diversity in Young Stellar Object
Abstract：Over 300 molecular species have been identified in the interstellar medium and circumstellar shells, revealing a diverse landscape of chemical complexity. Young Stellar Objects (YSOs) exhibit a wide variety of both simple and complex organic molecules (COMs), intricately linked to their physical properties and evolutionary stages. These objects play a pivotal role in shaping their surroundings, acting as potent sources of radiative and mechanical feedback that significantly influence the formation of interstellar molecules. Analyzing the millimeter and submillimeter spectra of YSOs offers crucial clues to the formation of numerous COMs, enhancing our understanding of the chemical complexity within these stellar nurseries. In this talk, I will discuss observational results from a large sample of YSOs and elaborate on how chemical diversity depends on the physical properties of the sources. I will also present astrochemical modeling results to describe the chemical evolution of several species and discuss how these models can be used to infer chemical origin and the physical properties of YSOs. By summarizing the current state of observational studies and astrochemical models, this presentation aims to elucidate the processes through which chemical complexity is attained in diverse YSOs.
Facilitator
-Name：Kotomi Taniguchi
Comment：(optional) English. You are also welcome to join us via zoom.
Zoom info: https://us02web.zoom.us/j/85668400316
Meeting ID: 856 6840 0316
Passcode: Please ask facilitator about zoom passcode
===============July 12 Fri==============
Campus：Mitaka
Seminar：NAOJ Seminar
Regularly Scheduled/Sporadic：Regular
Date and time：July 12, 2024 15:30-16:30
Place：Zoom/Large Seminar Room (hybrid)
Speaker：Dr. Maryam Saberi
Affiliation：University of Oslo
Title：Tracing the impact of Evolved Stars on the Galactic Chemical enrichment (ESGC)
Abstract:
In this presentation, I will discuss ESGC project, which is awarded funding from the Research Council of Norway.
The primary focus of the project is on evolved stars and their impact on enriching the chemical composition of interstellar mediums and galaxies.
I will begin by providing an introduction to evolved stars and the chemistry active in their outflow.
Solar-type stars eject a substantial amount of heavy elements and dust particles to the interstellar medium through strong stellar winds at late phases of stellar evolution, known as the asymptotic giant branch (AGB) phase, and therefore significantly influence the chemical composition of galaxies.In ESGC project, we aim to target two main gaps in our knowledge that can be significantly advanced with current observational facilities, new laboratory molecular data, and upgraded chemical models. These gaps concern the role of AGB stars in the production of fluorine in our Galaxy, which is an essential element for the maintenance of solidity in our bones and teeth, and the impact of a chromospheric UV radiation field on the chemistry and dust-formation process around AGB stars. Through this project, we aim to create a more realistic picture of the recycled materials and stardust from evolved stars by considering the impact of internal UV radiation in the chemical models. Finally, I will outline the observational and simulation approaches we are planning to use to achieve the main objectives of the project and highlighting the unique opportunities associated with each approach.
Facilitator
-Name：Jun-Ichi Morino