Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Hajime, Kawahara"'
Autor:
Sam O. M. Wright, Stevanus K. Nugroho, Matteo Brogi, Neale P. Gibson, Ernst J. W. de Mooij, Ingo Waldmann, Jonathan Tennyson, Hajime Kawahara, Masayuki Kuzuhara, Teruyuki Hirano, Takayuki Kotani, Yui Kawashima, Kento Masuda, Jayne L. Birkby, Chris A. Watson, Motohide Tamura, Konstanze Zwintz, Hiroki Harakawa, Tomoyuki Kudo, Klaus Hodapp, Shane Jacobson, Mihoko Konishi, Takashi Kurokawa, Jun Nishikawa, Masashi Omiya, Takuma Serizawa, Akitoshi Ueda, Sébastien Vievard, Sergei N. Yurchenko
Publikováno v:
The Astronomical Journal, Vol 166, Iss 2, p 41 (2023)
Individual vibrational band spectroscopy presents an opportunity to examine exoplanet atmospheres in detail, by distinguishing where the vibrational state populations of molecules differ from the current assumption of a Boltzmann distribution. Here,
Externí odkaz:
https://doaj.org/article/bee9f33443ea4f24b773a0ac03e15a1e
Autor:
Masataka Aizawa, Kojiro Kawana, Kazumi Kashiyama, Ryou Ohsawa, Hajime Kawahara, Fumihiro Naokawa, Tomoyuki Tajiri, Noriaki Arima, Hanchun Jiang, Tilman Hartwig, Kotaro Fujisawa, Toshikazu Shigeyama, Ko Arimatsu, Mamoru Doi, Toshihiro Kasuga, Naoto Kobayashi, Sohei Kondo, Yuki Mori, Shin-ichiro Okumura, Satoshi Takita, Shigeyuki Sako
Publikováno v:
Publications of the Astronomical Society of Japan. 74:1069-1094
We report a one-second-cadence wide-field survey for M-dwarf flares using the Tomo-e Gozen camera mounted on the Kiso Schmidt telescope. We detect 22 flares from M3-M5 dwarfs with rise times and amplitudes ranging from $5\, \mathrm{sec} \lesssim t_\m
Autor:
Thayne Currie, Kellen Lawson, Glenn Schneider, Wladimir Lyra, John Wisniewski, Carol Grady, Olivier Guyon, Motohide Tamura, Takayuki Kotani, Hajime Kawahara, Timothy Brandt, Taichi Uyama, Takayuki Muto, Ruobing Dong, Tomoyuki Kudo, Jun Hashimoto, Misato Fukagawa, Kevin Wagner, Julien Lozi, Jeffrey Chilcote, Taylor Tobin, Tyler Groff, Kimberly Ward-Duong, William Januszewski, Barnaby Norris, Peter Tuthill, Nienke van der Marel, Michael Sitko, Vincent Deo, Sebastien Vievard, Nemanja Jovanovic, Frantz Martinache, Nour Skaf
Publikováno v:
Nature Astronomy, 6, 751-759
Direct images of protoplanets embedded in disks around infant stars provide the key to understanding the formation of gas giant planets like Jupiter. Using the Subaru Telescope and Hubble Space Telescope, we find evidence for a jovian protoplanet aro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce6a51de4d0ee8b27a367f2a127c5305
http://arxiv.org/abs/2204.00633
http://arxiv.org/abs/2204.00633
Autor:
Christopher A. Watson, Ernst J. W. de Mooij, Stevanus K Nugroho, Stephanie Merritt, Neale P. Gibson, Hajime Kawahara
Publikováno v:
Nugroho, S K, Gibson, N P, de Mooij, E J W, Watson, C A, Kawahara, H & Merritt, S 2020, ' Searching for thermal inversion agents in the transmission spectrum of KELT-20b/MASCARA-2b: detection of neutral iron and ionised calcium H &K lines ', Monthly Notices of the Royal Astronomical Society, vol. 496, no. 1, pp. 504-522 . https://doi.org/10.1093/mnras/staa1459
We analyse the transmission spectra of KELT-20b/MASCARA-2b to search for possible thermal inversion agents. The data consist of three transits obtained using HARPSN and one using CARMENES. We removed stellar and telluric lines before cross-correlatin
Autor:
Hiroki Harakawa, Takuya Takarada, Yui Kasagi, Teruyuki Hirano, Takayuki Kotani, Masayuki Kuzuhara, Masashi Omiya, Hajime Kawahara, Akihiko Fukui, Yasunori Hori, Hiroyuki Tako Ishikawa, Masahiro Ogihara, John Livingston, Timothy D Brandt, Thayne Currie, Wako Aoki, Charles A Beichman, Thomas Henning, Klaus Hodapp, Masato Ishizuka, Hideyuki Izumiura, Shane Jacobson, Markus Janson, Eiji Kambe, Takanori Kodama, Eiichiro Kokubo, Mihoko Konishi, Vigneshwaran Krishnamurthy, Tomoyuki Kudo, Takashi Kurokawa, Nobuhiko Kusakabe, Jungmi Kwon, Yuji Matsumoto, Michael W McElwain, Koyu Mitsui, Takao Nakagawa, Norio Narita, Jun Nishikawa, Stevanus K Nugroho, Eugene Serabyn, Takuma Serizawa, Aoi Takahashi, Akitoshi Ueda, Taichi Uyama, Sébastien Vievard, Ji Wang, John Wisniewski, Motohide Tamura, Bun’ei Sato
We report the near-infrared radial-velocity (RV) discovery of a super-Earth planet on a 10.77-day orbit around the M4.5 dwarf Ross 508 ($J_\mathrm{mag}=9.1$). Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ad5d76e7e553e48e1c87d6a72ebdaae
Autor:
Alison Wong, Sebastiaan Y. Haffert, Frantz Martinache, Tyler D. Groff, Nemanja Jovanovic, Steven P. Bos, Vincent Deo, Kyohoon Ahn, Alexander T. Rodack, Michael Bottom, Barnaby Norris, Hajime Kawahara, Benjamin A. Mazin, Jared R. Males, Kelsey Miller, Takayuki Kotani, Kyle Van Gorkom, Richard A. Frazin, Nour Skaf, Sébastien Vievard, Julien Lozi, Thayne Currie, Olivier Guyon, Ruslan Belikov
Publikováno v:
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 1182303. SPIE
STARTPAGE=1182303;TITLE=Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
STARTPAGE=1182303;TITLE=Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
To directly detect exoplanets and protoplanetary disks, the development of high accuracy wavefront sensing and control (WFS&C) technologies is essential, especially for ground-based Extremely Large Telescopes (ELTs). The Subaru Coronagraphic Extreme
Autor:
Hajime Kawahara, Yui Kawashima, Kento Masuda, Ian J. M. Crossfield, Erwan Pannier, Dirk van den Bekerom
We present an auto-differentiable spectral modeling of exoplanets and brown dwarfs. This model enables a fully Bayesian inference of the high--dispersion data to fit the ab initio line-by-line spectral computation to the observed spectrum by combinin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e70ccb45707f94fa34397a801871060
http://arxiv.org/abs/2105.14782
http://arxiv.org/abs/2105.14782
Publikováno v:
The Astrophysical Journal. 930:162
The time series of light reflected from exoplanets by future direct imaging can provide spatial information with respect to the planetary surface. We apply sparse modeling to the retrieval method that disentangles the spatial and spectral information
Autor:
Nemanja Jovanovic, Olivier Guyon, Masato Ishizuka, Takayuki Kotani, Ananya Sahoo, Hajime Kawahara, Kenta Yoneta, Motohide Tamura, Julien Lozi, Sébastien Vievard
We will present a new instrument, REACH (Rigorous Exoplanetary Atmosphere Characterization with High dispersion coronography) to realize very high spectral resolution, over R=100,000 at extreme contrast by combining the high-resolution spectrograph I
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b5bb21500e36174cfad86f0661abe56
https://resolver.caltech.edu/CaltechAUTHORS:20210120-102416336
https://resolver.caltech.edu/CaltechAUTHORS:20210120-102416336
Autor:
Nemanja Jovanovic, Vincent Deo, Olivier Guyon, Takayuki Kotani, Ananya Sahoo, Julien Lozi, Masato Ishizuka, Sébastien Vievard, Hajime Kawahara
Publikováno v:
Adaptive Optics Systems VII.
Orbital parameters of stellar companions can be constrained by multi-epoch observations where the astrometric position relative to the host star is measured. Additionally, radial velocity (RV) measurements of the host star may constrain the companion