Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Riouhei Nakatani"'
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 281 (2024)
Photoevaporation driven by hydrogen-ionizing extreme-ultraviolet (EUV) radiation profoundly shapes the lives of diverse astrophysical objects. We construct an analytical model accounting for the finite timescales of photoheating and photoionization a
Externí odkaz:
https://doaj.org/article/bd63324aaf5e4c9cb343bdb5fcbf0841
Autor:
Riouhei Nakatani, Neal J. Turner, Yasuhiro Hasegawa, Gianni Cataldi, Yuri Aikawa, Sebastián Marino, Hiroshi Kobayashi
Publikováno v:
The Astrophysical Journal Letters, Vol 959, Iss 2, p L28 (2023)
While most debris disks consist of dust with little or no gas, a fraction have significant amounts of gas detected via emission lines of CO, ionized carbon, and/or atomic oxygen. Almost all such gaseous debris disks known are around A-type stars with
Externí odkaz:
https://doaj.org/article/0708264e9d0f4d24925db22d525545fd
Autor:
Takahiro Oyama, Yuki Ohno, Akemi Tamanai, Yoshimasa Watanabe, Satoshi Yamamoto, Takeshi Sakai, Shaoshan Zeng, Riouhei Nakatani, Nami Sakai
Publikováno v:
The Astrophysical Journal, Vol 957, Iss 1, p 4 (2023)
Deuterium fractionation in molecules is known as one of the most powerful tools to study chemical processes during star and planet formation. Among various interstellar molecules, methanol often shows very high deuterium fractionation. It is the most
Externí odkaz:
https://doaj.org/article/b791a2176dc8464ba38b492e0535b136
Autor:
Yuki Ohno, Takahiro Oyama, Akemi Tamanai, Shaoshan Zeng, Yoshimasa Watanabe, Riouhei Nakatani, Takeshi Sakai, Nami Sakai
Publikováno v:
The Astrophysical Journal, Vol 932, Iss 2, p 101 (2022)
Methanol (CH _3 OH) is an abundant interstellar species and is known to be an important precursor of various interstellar complex organic molecules. Among the methanol isotopologues, CH _2 DOH is one of the most abundant isotopologues and it is often
Externí odkaz:
https://doaj.org/article/e312f8ddb1544e7cab7a1a83e3c851fc
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 512:855-860
Atmospheric escape of close-in exoplanets can be driven by high energy radiation from the host star. The planetary outflows interacting with the stellar wind may generate observable transit signals that depend on the strength of the stellar wind. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adba68bace534eaee831cb0ecec69722
https://doi.org/10.1093/mnras/stac556
https://doi.org/10.1093/mnras/stac556
Autor:
Takahiro Oyama, Nami Sakai, takeshi sakai, Riouhei Nakatani, Yoshimasa Watanabe, Shaoshan Zeng, Akemi Tamanai, Yuki Ohno
Publikováno v:
Proceedings of the 2022 International Symposium on Molecular Spectroscopy.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3af0544a5e2d31a7b82282bd4e48d527
https://doi.org/10.15278/isms.2022.wn06
https://doi.org/10.15278/isms.2022.wn06
Publikováno v:
Proceedings of the International Astronomical Union. 16:158-163
Transit observations have revealed the existence of atmospheric escape in several hot Jupiters. High energy photons from the host star heat the upper atmosphere and drive the hydrodynamic escape. The escaping atmosphere can interact with the stellar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33b80e38145405365f0ddfc00bc522a1
https://doi.org/10.1017/s1743921322001260
https://doi.org/10.1017/s1743921322001260
Publikováno v:
Proceedings of the International Astronomical Union. 16:294-299
Photoelectric effect of dust grains by UV radiation is an important process for disk heating, but as a disk evolves, the amount of dust grains decreases. Photoeaporation is a disk dispersal process, which is caused by high-energy radiation. We perfor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2eb2289a4eb9dd127e8b44b2e6d7a9ba
https://doi.org/10.1017/s1743921322001296
https://doi.org/10.1017/s1743921322001296
Autor:
Muneaki Imai, Yoko Oya, Brian Svoboda, Hauyu Baobab Liu, Bertrand Lefloch, Serena Viti, Yichen Zhang, Cecilia Ceccarelli, Claudio Codella, Claire J. Chandler, Nami Sakai, Yuri Aikawa, Felipe O. Alves, Nadia Balucani, Eleonora Bianchi, Mathilde Bouvier, Gemma Busquet, Paola Caselli, Emmanuel Caux, Steven Charnley, Spandan Choudhury, Nicolas Cuello, Marta De Simone, Francois Dulieu, Aurora Durán, Lucy Evans, Cécile Favre, Davide Fedele, Siyi Feng, Francesco Fontani, Logan Francis, Tetsuya Hama, Tomoyuki Hanawa, Eric Herbst, Shingo Hirano, Tomoya Hirota, Andrea Isella, Izaskun Jímenez-Serra, Doug Johnstone, Claudine Kahane, Romane Le Gal, Laurent Loinard, Ana López-Sepulcre, Luke T. Maud, María José Maureira, Francois Menard, Seyma Mercimek, Anna Miotello, George Moellenbrock, Shoji Mori, Nadia M. Murillo, Riouhei Nakatani, Hideko Nomura, Yasuhiro Oba, Ross O’Donoghue, Satoshi Ohashi, Yuki Okoda, Juan Ospina-Zamudio, Jaime Pineda, Linda Podio, Albert Rimola, Takeshi Sakai, Dominique Segura-Cox, Yancy Shirley, Vianney Taquet, Leonardo Testi, Charlotte Vastel, Naoki Watanabe, Yoshimasa Watanabe, Arezu Witzel, Ci Xue, Bo Zhao, Satoshi Yamamoto
Publikováno v:
The Astrophysical Journal
The Astrophysical Journal, 2022, 934 (1), pp.70. ⟨10.3847/1538-4357/ac77e7⟩
The Astrophysical Journal, 934(1):70
The Astrophysical Journal, 2022, 934 (1), pp.70. ⟨10.3847/1538-4357/ac77e7⟩
The Astrophysical Journal, 934(1):70
Imai et al.
The chemical diversity of low-mass protostellar sources has so far been recognized, and environmental effects are invoked as its origin. In this context, observations of isolated protostellar sources without the influence of nearby o
The chemical diversity of low-mass protostellar sources has so far been recognized, and environmental effects are invoked as its origin. In this context, observations of isolated protostellar sources without the influence of nearby o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2a785de5e380ad698a24e02aba5d587
https://hdl.handle.net/11391/1535373
https://hdl.handle.net/11391/1535373
Autor:
Hauyu Baobab Liu, Hiroshi Kobayashi, Yichen Zhang, Nami Sakai, Koji Murakawa, Satoshi Okuzumi, Hidekazu Tanaka, Satoshi Ohashi, Riouhei Nakatani
Publikováno v:
The Astrophysical Journal.
Ring structures are observed by (sub-)millimeter dust continuum emission in various circumstellar disks from early stages of Class 0 and I to late stage of Class II young stellar objects (YSOs). In this paper, we study one of the possible scenarios o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23c8377e6e09e94b23f7b8b6621d38bc
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100859561
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100859561