Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Koji Murakawa"'
Autor:
Mitsuhiko Honda, Ryo Tazaki, Koji Murakawa, Hiroshi Terada, Tomoyuki Kudo, Takashi Hattori, Jun Hashimoto, Motohide Tamura, Makoto Watanabe
Publikováno v:
Publications of the Astronomical Society of Japan. 74:851-856
Spatially resolved L-band spectro-polarimetric observations were carried out toward a protoplanetary disk around the Herbig Fe star HD 142527 using the polarimetry mode of the InfraRed Camera and Spectrometer on the 8.2 m Subaru Telescope. The 2.9–
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1c8eac39481b21a72e25a650b4f275c
https://doi.org/10.1093/pasj/psac041
https://doi.org/10.1093/pasj/psac041
Relativistic aberration of light mimicked by microring resonator-based optical All-Pass Filter (APF)
Autor:
Nathaniel Joseph C. Libatique, Koji Murakawa, Aria Buenaventura, Annelle Chua, Benjamin B. Dingel
Publikováno v:
Optik. 183:82-91
We report a photonic circuit analogue of the relativistic aberration of light (AL) phenomenon in Special Relativity (SR) using an All-Pass Filter (APF). The APF is one of the key building blocks in Photonic Integrated Circuits (PICs). We investigate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ceaa897879db602eef2bb9408a95a97
https://doi.org/10.1016/j.ijleo.2018.12.149
https://doi.org/10.1016/j.ijleo.2018.12.149
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
Publikováno v:
Astrophysical Journal, 921(2):173. IOP Publishing Ltd.
We study the $3~\mu$m scattering feature of water ice detected in the outer disk of HD 142527 by performing radiative transfer simulations. We show that an ice mass abundance at the outer disk surface of HD 142527 is much lower than estimated in a pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ffe1a2f9b012dc79b2dcc39efca8741
Publikováno v:
Journal of Modern Optics. 65:2171-2178
We report a link (or optical analogue) between the relativistic Thomas rotation angle effect found in the special theory of relativity (STR), and the phase response of an all-pass filter (APF), one of the building blocks of the rapidly evolving field
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45de34f20329ba1f0d763da0605ec51a
https://doi.org/10.1080/09500340.2018.1502826
https://doi.org/10.1080/09500340.2018.1502826
Publikováno v:
Astronomy & Astrophysics. 492:731-734
We present the JHK-band high-resolution polarimetric images of the low-mass proto-stellar object HL Tau using the adaptive optics-equipped CIAO instrument on the Subaru telescope. Our polarization images show a butterfly-shaped polarization disk with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60b607577dbc4f8ff9de46d81f695132
https://doi.org/10.1051/0004-6361:200810723
https://doi.org/10.1051/0004-6361:200810723
Publikováno v:
Astronomy & Astrophysics. 490:673-684
Aims. We investigate the physical properties of the dust environment of the massive proto-stellar object CRL 2136 by means of two-dimensional radiative transfer modeling, which combines fitting of the spectral energy distribution, the intensity image
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12e127a781cc3aa4bf17ce708752e220
https://doi.org/10.1051/0004-6361:200809901
https://doi.org/10.1051/0004-6361:200809901
Autor:
Miki Ishii, Thomas Preibisch, Koji Murakawa, N. Ageorges, Dieter Schertl, Karl-Heinz Hofmann, Gerd Weigelt, S. Oya, A. Rosen, Stefan Kraus
Publikováno v:
Astronomy & Astrophysics. 488:L75-L78
Aims. We investigate the dust properties of the disk and envelope of the Herbig Be star R Mon by means of near-infrared multiwave-length imaging polarimetry. Methods. We obtained JHK-band polarimetric images using the adaptive optics instruments NACO
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9ea75819b82256b9604f04bbb435cff
https://doi.org/10.1051/0004-6361:200810462
https://doi.org/10.1051/0004-6361:200810462
Autor:
Karl-Heinz Hofmann, Shin Oya, Dieter Schertl, Gerd Weigelt, Keiichi Ohnaka, Thomas Driebe, Koji Murakawa
Publikováno v:
Astronomy & Astrophysics. 489:195-206
Aims. We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo. Methods. We performed bi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09201983b206bcfa26a575799dd69d07
https://doi.org/10.1051/0004-6361:20078623
https://doi.org/10.1051/0004-6361:20078623
Autor:
Indra Bains, Anna Bartkiewicz, Anita M. S. Richards, Marian Szymczak, Jeremy Yates, Malcolm Gray, E. Mendoza-Torres, H. J. van Langevelde, M. R. W. Masheder, R. J. Cohen, Sandra Etoka, Philip J. Diamond, Wouter Vlemmings, E. E. Lekht, Koji Murakawa
Publikováno v:
Proceedings of the International Astronomical Union. 3:261-265
Rapidly-evolving red supergiants (RSG) lose half or more of their mass before ending their lives as supernovae. Masers allow us to study the mass loss from 4 nearby RSG in AU-scale detail using MERLIN and EVN/global VLBI. The water maser clouds are o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3a932cacbe47275f42ed30fecefcdc10
https://doi.org/10.1017/s1743921307013105
https://doi.org/10.1017/s1743921307013105