Search Results 1-20 of 375

  • Dust formation and evolution from mass-losing stars to the solar system  [in Japanese]

    瀧川 晶

    遊・星・人 = Planetary people : 日本惑星科学会誌 29(1), 4-13, 2020-03

  • Impact of space weather on climate and habitability of terrestrial-type exoplanets

    Airapetian V. S. , Barnes R. , Cohen O. , Collinson G. A. , Danchi W. C. , Dong C. F. , Del Genio A. D. , France K. , Garcia-Sage K. , Glocer A. , Gopalswamy N. , Grenfell J. L. , Gronoff G. , Güdel M. , Herbst K. , Henning W. G. , Jackman C. H. , Jin M. , Johnstone C. P. , Kaltenegger L. , Kay C. D. , Kobayashi K. , Kuang W. , Li G. , Lynch B. J. , Lüftinger T. , Luhmann J. G. , Maehara H. , Mlynczak M. G. , Notsu Y. , Osten R. A. , Ramirez R. M. , Rugheimer S. , Scheucher M. , Schlieder J. E. , Shibata K. , Sousa-Silva C. , Stamenković V. , Strangeway R. J. , Usmanov A. V. , Vergados P. , Verkhoglyadova O. P. , Vidotto A. A. , Voytek M. , Way M. J. , Zank G. P. , Yamashiki Y.

    … the conditions favourable for the origin, development and sustainment of life as we know it in other worlds, we need to understand the nature of global (astrospheric), and local (atmospheric and surface) environments of exoplanets in the habitable zones (HZs) around G-K-M dwarf stars including our young Sun. Global environment is formed by propagated disturbances from the planet-hosting stars in the form of stellar flares, coronal mass ejections, energetic particles and winds collectively known as astrospheric space …

    International Journal of Astrobiology, 1-59, 2019-07-31

    IR 

  • Orbital evolution of a circumbinary planet in a gaseous disk

    Yamanaka Akihiro , Sasaki Takanori

    … Sub-Jupiter classed circumbinary planets discovered in close-in binary systems have orbits just beyond the dynamically unstable region, which is determined by the eccentricity and mass ratio of the host binary stars. … This outward transportation is driven by the balance of orbital excitation of the central stars inside the gravitationally unstable region and damping by the gas-drag force. … We find CBPs' orbits close to the instability boundaries are explained by our orbital evolution scenario. …

    Earth, Planets and Space (71), 2019-07-30

    IR 

  • Time Evolution of Broadband Nonthermal Emission from Supernova Remnants in Different Circumstellar Environments

    Yasuda Haruo , Lee Shiu-Hang

    … We find that time evolution of emission characteristics in the VHE regime is mainly dictated by two factors: the number density of the target particles and the amplified magnetic field in the shocked medium. … Future SNR observations with CTA will thus be promising for probing the CSM environment of SNe and hence their progenitor properties, including the mass-loss history of massive stars. …

    Astrophysical Journal (876), 2019-05-01

    IR 

  • The spectrum of a fast shock breakout from a stellar wind

    Ioka Kunihito , Levinson Amir , Nakar Ehud

    … The model incorporates photon escape through the finite optical depth wind, assuming a diffusion approximation and a quasi-steady evolution of the shock structure during the breakout phase. …

    Monthly Notices of the Royal Astronomical Society 484(3), 3502-3509, 2019-04

    IR 

  • Formation of the first generation of stars and blackholes in the Universe

    YOSHIDA Naoki

    … It is thought that all of the rich content in the present-day Universe developed through gravitational amplification of primeval density fluctuations generated in the very early phase of cosmic evolution. … The standard theoretical model based on an array of recent observations accurately predicts the physical conditions in the early Universe, and powerful super-computers allow us to simulate in detail the formation and evolution of cosmic structure to the present epoch. …

    Proceedings of the Japan Academy, Series B 95(1), 17-28, 2019

    J-STAGE 

  • Oxygen Isotopic Exchange between Amorphous Silicate and Water Vapor and Its Implications for Oxygen Isotopic Evolution in the Early Solar System

    Yamamoto Daiki , Kuroda Minami , Tachibana Shogo , Sakamoto Naoya , Yurimoto Hisayoshi

    Astrophysical journal 865(2), 98, 2018-10-01

  • Practicing a newly developed framework for cultivating scientific thinking and problem-solving in high school Earth Science "the evolution of stars"  [in Japanese]

    小荒井 千人 , 松川 正樹 , 原田 和雄 , KOARAI Kazuto , MATSUKAWA Masaki , HARADA Kazuo , 小荒井 千人(慶應義塾横浜初等部) , 松川 正樹(東京学芸大学 理科教員高度支援センター) , 原田 和雄(東京学芸大学 広域自然科学講座 生命科学分野)

    東京学芸大学紀要. 自然科学系 = Bulletin of Tokyo Gakugei University 70, 151-159, 2018-09

    IR 

  • The Impact of Feedback in Massive Star Formation. II. Lower Star Formation Efficiency at Lower Metallicity

    Tanaka Kei E. I. , Tan Jonathan C. , Zhang Yichen , Hosokawa Takashi

    … We conduct a theoretical study of the formation of massive stars over a wide range of metallicities from 10⁻⁵ to 1 Z☉ and evaluate the star formation efficiencies (SFEs) from prestellar cloud cores taking into account multiple feedback processes. … At solar metallicity, launching of magneto-centrifugally driven outflows is the dominant feedback process to set SFEs, while radiation pressure, which has been regarded as pivotal, makes only a minor contribution even in the formation of stars over 100 M☉. …

    The Astrophysical Journal 861(1), 2018-07-01

    IR 

  • Searching for previously unknown classes of objects in the AKARI-NEP Deep data with fuzzy logic SVM algorithm

    Poliszczuk Artem , Solarz Aleksandra , Pollo Agnieszka , The NEP-Deep Team

    … In this proceedings application of a fuzzy Support Vector Machine (FSVM) learning algorithm, to classify mid-infrared (MIR) sources from the AKARI NEP Deep field into three classes: stars, galaxies and AGNs, is presented. … We created reliable catalogues of galaxies, stars and AGNs consisting of objects with MIR measurements, some of them with no optical counterparts. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 375-378, 2018-03-09

    IR 

  • DEIMOS Spectroscopy of Star-Forming Galaxies in the AKARI North Ecliptic Pole-Deep Field

    Kim Helen K. , Malkan Matthew A. , 大井 渚 , Burgarella Denis , Buat Veronique , 高木 俊暢 , 松原 英雄 , Kim Helen K. , Malkan Matthew A. , Oi Nagisa , Burgarella Denis , Buat Veronique , Takagi Toshinobu , Matsuhara Hideo

    We present follow-up optical DEIMOS/Keck-II spectra of in the order of 180 galaxies (median z in the order of 0.7) in the AKARI NEP-Deep field. The spectroscopic redshifts (z(sub spec)) agree well wit …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 371-374, 2018-03-09

    IR 

  • Line flux measurement of infrared galaxies in the AKARI NEP field with Keck/DEIMOS

    正垣 綾乃 , 松浦 周二 , 大井 渚 , 後藤 友嗣 , 松原 英雄 , 村田 一心 , 高木 俊暢 , 大塚 拓也 , Malkan Matthew , 中禮 沙也加 , Shogaki Ayano , Matsuura Shuji , Oi Nagisa , Goto Tomotsugu , Matsuhara Hideo , Murata Kazumi , Takagi Toshinobu , Otsuka Takuya , Malkan Matthew , Churei Sayaka

    We analyzed 553 spectra of infrared sources in the AKARI NEP deep field observed with Keck/DEIMOS in 2011. In previous work, we conducted a spectroscopic diagnostics of the sources based on relative l …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 367-370, 2018-03-09

    IR 

  • Herschel 250 micrometers detected star-forming (SF) galaxies over the North Ecliptic Pole (NEP) Wide field of AKARI

    Kim Seong Jin , Jeong Woong-Seob , Lee Hyung Mok , 後藤 友嗣 , Pearson Chris , Shim Hyunjin , 松原 英雄 , The AKARI NEP Team , Kim Seong Jin , Jeong Woong-Seob , Lee Hyung Mok , Goto Tomotsugu , Pearson Chris , Shim Hyunjin , Matsuhara Hideo , The AKARI NEP Team

    We study infrared properties of star-forming (SF) galaxies selected by 250 micrometers band detection of the Herschel/SPIRE survey on the entire North Ecliptic Pole (NEP) field of AKARI. We matched SP …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 363-365, 2018-03-09

    IR 

  • AKARI MIR slitless spectroscopic survey of galaxies at z less than 0.5

    大山 陽一 , 和田 武彦 , 松原 英雄 , 高木 俊暢 , Malkan M. , 後藤 友嗣 , 江上 英一 , Lee Hyung Mok , Im Myung , Kim J. -H. , Pearson Chris , 稲見 華恵 , 大薮 進喜 , 臼井 文彦 , Burgarella Denis , Mazyed F. , 今西 昌俊 , Jeong Woong-Seob , 宮地 崇光 , DiazTello J. , 中川 貴雄 , Oyama Yoichi , Wada Takehiko , Matsuhara Hideo , Takagi Toshinobu , Malkan M. , Goto Tomotsugu , Egami Eiichi , Lee Hyung Mok , Im Myung , Kim J. -H. , Pearson Chris , Inami Hanae , Oyabu Shinki , Usui Fumihiko , Burgarella Denis , Mazyed F. , Imanishi Masatoshi , Jeong Woong-Seob , Miyaji Takamitsu , DiazTello J. , Nakagawa Takao

    … We aim to study star-forming galaxies by using a blind spectroscopic survey at mid-infrared (MIR) wavelengths to understand evolution of their star formation rate (SFR) and specific SFR (SFR per stellar mass) up to z in the order of 0.5, by paying particular attention to their Polycyclic Aromatic Hydrocarbon (PAH) properties. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 359-362, 2018-03-09

    IR 

  • Surface density: a new parameter in the fundamental metallicity relation of star-forming galaxies

    橋本 哲也 , 後藤 友嗣 , 百瀬 莉恵子 , Hashimoto Tetsuya , Goto Tomotsugu , Momose Rieko

    … or molecular-gas FMR), and it has a profound implication on models of galaxy evolution. … We suggest that future analyses and models of galaxy evolution should consider the FMR in a 4D space that includes surface density. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 351-354, 2018-03-09

    IR 

  • A systematic search for ULIRGs/HyLIRGs at intermediate redshifts with optically-faint AKARI FIS Bright sources

    Chen Xiaoyang , 秋山 正幸 , 野田 博文 , 渡邉 達朗 , Abdurrouf , 鳥羽 儀樹 , 山村 一誠 , Chen Xiaoyang , Akiyama Masayuki , Noda Hirofumi , Watanabe Tatsuro , Abdurrouf , Toba Yoshiki , Yamamura Issei

    Ultra- and Hyper-luminous IR galaxies (L(sub IR) greater than 10(exp 12) solar luminosity for ULIRGs and L(sub IR) greater than 10(exp 13) solar luminosity for HyLIRGs) are populations of galaxies wit …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 345-346, 2018-03-09

    IR 

  • AKARI slit-less spectroscopy and broadband infrared photometry observations of Hickson Compact Groups 56 and 92

    池内 綾人 , 左近 樹 , 尾中 敬 , Galliano Frederic , Wu Ronin , Ikeuchi Ayato , Sakon Itsuki , Onaka Takashi , Galliano Frederic , Wu Ronin

    … The study provides us information on the effects of interactions on the galactic environments of member galaxies and their evolution. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 333-336, 2018-03-09

    IR 

  • Analysis of Ice Absorption Features toward YSO Candidates using AKARI

    木村 智幸 , 尾中 敬 , 左近 樹 , 下西 隆 , Kimura Tomoyuki , Onaka Takashi , Sakon Itsuki , Shimonishi Takashi

    We serendipitously discovered two young stellar object (YSO) candidates using the slit-less spectroscopic mode of the InfraRed Camera (IRC) on board AKARI. They are not associated with any known star- …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 321-324, 2018-03-09

    IR 

  • Dust dissipation timescales of protoplanetary disks and debris disks

    前嶋 宏志 , 小島 拓也 , 中川 貴雄 , Kwon Jungmi , 瀧田 怜 , Maeshima Hiroshi , Kojima Takuya , Nakagawa Takao , Kwon Jungmi , Takita Satoshi

    … The far-infrared excess of stars with protoplanetary disks and debris disks is expected to provide us with key information on dust dissipation process in the outer disks. … We carried out two type of studies: one is the study on protoplanetary disks based on observations of T Tauri stars, and the other is the study on debris disks based on observations of A-type main sequence stars. …

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (JAXA-SP-17-009E), 313-316, 2018-03-09

    IR 

Page Top