Zobrazeno 1 - 10
of 693
pro vyhledávání: '"Ishikawa Hiroyuki"'
Autor:
Kawashima, Yui, Kawahara, Hajime, Kasagi, Yui, Ishikawa, Hiroyuki Tako, Masuda, Kento, Kotani, Takayuki, Kudo, Tamoyuki, Hirano, Teruyuki, Kuzuhara, Masayuki, Nugroho, Stevanus K, Livingston, John, Harakawa, Hiroki, Nishikawa, Jun, Omiya, Masashi, Takarada, Takuya, Tamura, Motohide, Ueda, Akitoshi
Brown dwarfs provide a unique opportunity to study atmospheres and their physical and chemical processes with high precision, especially in temperature ranges relevant to exoplanets. In this study, we performed high-resolution ($R \sim 70,000$) spect
Externí odkaz:
http://arxiv.org/abs/2410.11561
Autor:
Kawahara, Hajime, Kawashima, Yui, Tada, Shotaro, Ishikawa, Hiroyuki Tako, Hosokawa, Ko, Kasagi, Yui, Kotani, Takayuki, Masuda, Kento, Nuguroho, Stevanus, Tamura, Motohide, Yama, Hibiki, Kitzmann, Daniel, Minesi, Nicolas, Morris, Brett M.
Modeling based on differentiable programming holds great promise for astronomy, as it can employ techniques such as Hamiltonian Monte Carlo, gradient-based optimization, and other machine learning techniques. This new programming paradigm has motivat
Externí odkaz:
http://arxiv.org/abs/2410.06900
Autor:
Kagetani, Taiki, Narita, Norio, Kimura, Tadahiro, Hirano, Teruyuki, Ikoma, Masahiro, Ishikawa, Hiroyuki Tako, Giacalone, Steven, Fukui, Akihiko, Kodama, Takanori, Gore, Rebecca, Schroeder, Ashley, Hori, Yasunori, Kawauchi, Kiyoe, Watanabe, Noriharu, Mori, Mayuko, Zou, Yujie, Ikuta, Kai, Krishnamurthy, Vigneshwaran, Zink, Jon, Hardegree-Ullman, Kevin, Harakawa, Hiroki, Kudo, Tomoyuki, Kotani, Takayuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kuzuhara, Masayuki, de Leon, Jerome P., Livingston, John H., Nishikawa, Jun, Omiya, Masashi, Palle, Enric, Parviainen, Hannu, Serizawa, Takuma, Teng, Huan-Yu, Ueda, Akitoshi, Tamura, Motohide
We report the mass determination of TOI-519 b, a transiting substellar object around a mid-M dwarf. We carried out radial velocity measurements using Subaru / InfraRed Doppler (IRD), revealing that TOI-519 b is a planet with a mass of $0.463^{+0.082}
Externí odkaz:
http://arxiv.org/abs/2304.14703
Autor:
Uyama, Taichi, Beichman, Charles, Kuzuhara, Masayuki, Janson, Markus, Kotani, Takayuki, Mawet, Dimitri, Sato, Bun'ei, Tamura, Motohide, Ishikawa, Hiroyuki Tako, Cale, Bryson, Currie, Thayne, Harakawa, Hiroki, Henning, Thomas, Hirano, Teruyuki, Hodapp, Klaus, Hori, Yasunori, Ishizuka, Masato, Jacobson, Shane, Kasagi, Yui, Kokubo, Eiichiro, Konishi, Mihoko, Kudo, Tomoyuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kwon, Jungmi, Machida, Masahiro, Nakagawa, Takao, Narita, Norio, Nishikawa, Jun, Ogihara, Masahiro, Omiya, Masashi, Serizawa, Takuma, Ueda, Akitoshi, Vievard, Sebastien, Wang, Ji
The Subaru telescope is currently performing a strategic program (SSP) using the high-precision near-infrared (NIR) spectrometer IRD to search for exoplanets around nearby mid/late-M~dwarfs via radial velocity (RV) monitoring. As part of the observin
Externí odkaz:
http://arxiv.org/abs/2302.13354
Autor:
Hirano, Teruyuki, Dai, Fei, Livingston, John H., Kasagi, Yui, Narita, Norio, Ishikawa, Hiroyuki Tako, Grziwa, Sascha, Lam, Kristine W. F., Miyakawa, Kohei, Serrano, Luisa M., Matsumoto, Yuji, Kokubo, Eiichiro, Kimura, Tadahiro, Ikoma, Masahiro, Winn, Joshua N., Wisniewski, John P., Harakawa, Hiroki, Teng, Huan-Yu, Cochran, William D., Fukui, Akihiko, Gandolfi, Davide, Guenther, Eike W., Hori, Yasunori, Ikuta, Kai, Kawauchi, Kiyoe, Knudstrup, Emil, Korth, Judith, Kotani, Takayuki, Krishnamurthy, Vigneshwaran, Kudo, Tomoyuki, Kurokawa, Takashi, Kuzuhara, Masayuki, Luque, Rafael, Mori, Mayuko, Nishikawa, Jun, Omiya, Masashi, Orell-Miquel, Jaume, Palle, Enric, Persson, Carina M., Redfield, Seth, Serabyn, Eugene, Smith, Alexis M. S., Takahashi, Aoi, Takarada, Takuya, Ueda, Akitoshi, Van Eylen, Vincent, Vievard, Sebastien, Tamura, Motohide, Sato, Bun'ei
We report on the discovery of an Earth-sized transiting planet ($R_p=1.015\pm0.051\,R_\oplus$) in a $P=4.02$ day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light curve data b
Externí odkaz:
http://arxiv.org/abs/2302.00699
Autor:
Harakawa, Hiroki, Takarada, Takuya, Kasagi, Yui, Hirano, Teruyuki, Kotani, Takayuki, Kuzuhara, Masayuki, Omiya, Masashi, Kawahara, Hajime, Fukui, Akihiko, Hori, Yasunori, Ishikawa, Hiroyuki Tako, Ogihara, Masahiro, Livingston, John, Brandt, Timothy D., Currie, Thayne, Aoki, Wako, Beichman, Charles A., Henning, Thomas, Hodapp, Klaus, Ishizuka, Masato, Izumiura, Hideyuki, Jacobson, Shane, Janson, Markus, Kambe, Eiji, Kodama, Takanori, Kokubo, Eiichiro, Konishi, Mihoko, Krishnamurthy, Vigneshwaran, Kudo, Tomoyuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kwon, Jungmi, Matsumoto, Yuji, McElwain, Michael W., Mitsui, Koyu, Nakagawa, Takao, Narita, Norio, Nishikawa, Jun, Nugroho, Stevanus K., Serabyn, Eugene, Serizawa, Takuma, Takahashi, Aoi, Ueda, Akitoshi, Uyama, Taichi, Vievard, Sébastien, Wang, Ji, Wisniewski, John, Tamura, Motohide, Sato, Bun'ei
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:
http://arxiv.org/abs/2205.11986
Autor:
Takizawa, Takeshi, Tanabe, Satoshi, Nakano, Hisashi, Utsunomiya, Satoru, Maruyama, Katsuya, Kaidu, Motoki, Ishikawa, Hiroyuki, Onda, Kiyoshi
Publikováno v:
In Physica Medica November 2024 127
Autor:
Mori, Mayuko, Livingston, John H., de Leon, Jerome, Narita, Norio, Hirano, Teruyuki, Fukui, Akihiko, Collins, Karen A., Fujita, Naho, Hori, Yasunori, Ishikawa, Hiroyuki Tako, Kawauchi, Kiyoe, Stassun, Keivan G., Watanabe, Noriharu, Giacalone, Steven, Gore, Rebecca, Schroeder, Ashley, Dressing, Courtney D., Bieryla, Allyson, Jensen, Eric L. N., Massey, Bob, Shporer, Avi, Kuzuhara, Masayuki, Charbonneau, David, Ciardi, David R., Doty, John P., Esparza-Borges, Emma, Harakawa, Hiroki, Hodapp, Klaus, Ikoma, Masahiro, Ikuta, Kai, Isogai, Keisuke, Jenkins, Jon M., Kagetani, Taiki, Kimura, Tadahiro, Kodama, Takanori, Kotani, Takayuki, Krishnamurthy, Vigneshwaran, Kudo, Tomoyuki, Kurita, Seiya, Kurokawa, Takashi, Kusakabe, Nobuhiko, Latham, David W., McLean, Brian, Murgas, Felipe, Nishikawa, Jun, Nishiumi, Taku, Omiya, Masashi, Osborn, Hugh P., Palle, Enric, Parviainen, Hannu, Ricker, George R., Seager, Sara, Serizawa, Takuma, Tamura, Motohide, Teng, Huan-Yu, Terada, Yuka, Twicken, Joseph D., Ueda, Akitoshi, Vanderspek, Roland, Vievard, Sébastien, Winn, Joshua N., Zou, Yujie
We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of $3.09 \pm 0.11 \,R_\oplus$ and an orbital period of $2.5 \,\rm{days}$, using a combination of TESS and follow-
Externí odkaz:
http://arxiv.org/abs/2203.02694
Autor:
Aoki, Wako, Beers, Timothy C., Honda, Satoshi, Ishikawa, Hiroyuki T., Matsuno, Tadafumi, Placco, Vinicius M., Yoon, Jinmi, Harakawa, Hiroki, Hirano, Teruyuki, Hodapp, Klaus, Ishizuka, Masato, Jacobson, Shane, Kotani, Takayuki, Kudo, Tomoyuki, Kurokawa, Takashi, Kuzuhara, Masayuki, Nishikawa, Jun, Omiya, Masashi, Serizawa, Takuma, Tamura, Motohide, Ueda, Akitoshi, Vievard, Sebastien
Silicon and Strontium are key elements to explore the nucleosynthesis and chemical evolution of the Galaxy by measurements of very metal-poor stars. There are, however, only a few useful spectral lines of these elements in the optical range that are
Externí odkaz:
http://arxiv.org/abs/2112.07433
Autor:
Ishikawa, Hiroyuki Tako, Aoki, Wako, Hirano, Teruyuki, Kotani, Takayuki, Kuzuhara, Masayuki, Omiya, Masashi, Hori, Yasunori, Kokubo, Eiichiro, Kudo, Tomoyuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Narita, Norio, Nishikawa, Jun, Ogihara, Masahiro, Ueda, Akitoshi, Currie, Thayne, Henning, Thomas, Kasagi, Yui, Kolecki, Jared R., Kwon, Jungmi, Machida, Masahiro N., McElwain, Michael W., Nakagawa, Takao, Vievard, Sebastien, Wang, Ji, Tamura, Motohide, Sato, Bun'ei
Detailed chemical analyses of M dwarfs are scarce but necessary to constrain the formation environment and internal structure of planets being found around them. We present elemental abundances of 13 M dwarfs (2900 < Teff < 3500 K) observed in the Su
Externí odkaz:
http://arxiv.org/abs/2112.00173