Article
Astronomy & Astrophysics
Martin Glatzle, Luca Graziani, Benedetta Ciardi
Summary: The presence of charged dust grains has a significant impact on the physical evolution of the interstellar medium, but this process is still poorly explored in numerical simulations. A novel implementation of grain charging in a radiative transfer code is introduced in this study, and its effects on grain properties and charge distribution are evaluated. The findings open up possibilities for further studies on the physical evolution of the dusty ISM accessible through observations of galaxies at different redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Andrea Ferrara, Celine Peroux
Summary: The cosmic dust mass density significantly drops from redshift z = 1 to z = 0, with dust mainly destroyed by astration and supernova shocks within galaxies. Each supernova is found to destroy only a small amount of dust, potentially due to effective shielding mechanisms.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Lopez-Corredoira, C. M. Gutierrez
Summary: The study explores the relation between dust distribution, internal absorption, and FIR emission in spiral galaxies, finding that the average internal attenuation of galaxies is negligible on average due to the relation of dust mass with size. The study also provides a formula that can be used as a cosmological test at any redshift, showing potential for future use when observing galaxies with improved sensitivity.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Fang Yi, Yuan Haibo, Zhang Ruoyi, Gao Jian, Xu Shuai
Summary: We calculated empirical reddening and extinction coefficients using the 'star pair' method, photometric data, and spectroscopic data. The coefficients for different colors and bands were found and they are consistent with the predictions of Fitzpatrick's extinction law. Temperature-dependent variations of coefficients were observed, especially for ultraviolet passbands. The new coefficients are recommended for dereddening the Swift-UVOT data in the future.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Venkata Lakshmi Karri, Sumalya Kaluva, Ajay Chaudhari, Takashi Onaka, Mahadevappa Naganathappa
Summary: This paper discusses the infrared features of C-24 based on density functional theory calculation and suggests that some features observed in celestial objects may be attributed to C-24. The electronic absorption spectra of C-24 isomers are calculated and compared with the bump feature at 217 nm in the interstellar extinction curve. Four groups of C-24 isomers, namely cage, planar, bowl, and ring forms, are considered in neutral and charged states. The study reveals significant changes in infrared and electronic absorption spectra, as well as structural parameters, upon ionization.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Relano, I De Looze, A. Saintonge, K-C Hou, L. E. C. Romano, K. Nagamine, H. Hirashita, S. Aoyama, I Lamperti, U. Lisenfeld, M. W. L. Smith, J. Chastenet, T. Xiao, Y. Gao, M. Sargent, S. A. van der Giessen
Summary: This study analyzes the spectral energy distribution of a large sample of galaxies and investigates the evolution of dust grain size distribution. It finds that the observed distribution is generally consistent with simulations, but there are some massive galaxies deviating from the predictions. The inclusion of diffusion mechanism could explain the observed deviations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jeremy Chastenet, Ilse De Looze, Brandon S. Hensley, Bert Vandenbroucke, Mike J. Barlow, Jeonghee Rho, Aravind P. Ravi, Haley L. Gomez, Florian Kirchschlager, Juan Macias-Perez, Mikako Matsuura, Kate Pattle, Nicolas Ponthieu, Felix D. Priestley, Monica Relano, Alessia Ritacco, Roger Wesson
Summary: In this paper, the authors present the detection of polarized dust emission in the Crab pulsar wind nebula and constrain the composition and properties of the dust. They find the presence of large grains and the coexistence of carbonaceous and silicate grains in the Crab Nebula. The study also provides the temperature and mass ranges of the dust.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Anton A. Smirnov, Sergey S. Savchenko, Denis M. Poliakov, Alexander A. Marchuk, Aleksandr V. Mosenkov, Vladimir B. Il'in, George A. Gontcharov, Javier Roman, Jonah Seguine
Summary: Using machine learning and neural networks, we successfully isolated galactic cirrus filaments from SDSS Stripe 82 data. Our study found that only filaments brighter than 26 mag arcsec(-2) in the SDSS r band can be identified based on their distinctive colors in the optical bands. We also discovered a significant impact of data processing on color estimation, including flat-fielding, masking of bright stars, and sky subtraction. By analyzing the color distribution of filaments with mock simulations, we concluded that most filaments fall within the ranges of 0.55 <= g - r <= 0.73 and 0.01 <= r - i <= 0.33. Our work provides a useful framework for analyzing various types of low surface brightness features in deep optical surveys and includes a catalog of dust filaments for practical purposes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alexander A. Marchuk, Anton A. Smirnov, Aleksandr Mosenkov, Vladimir B. Il'in, George A. Gontcharov, Sergey S. Savchenko, Javier Roman
Summary: This study measures the fractal dimension of cirrus clouds using optical data for the first time, finding that the averaged fractal dimension in optical data is significantly larger than in IR data. The discrepancy in fractal dimensions may be explained by differences in angular resolution and physical properties of the clouds, with further simulations needed for confirmation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
F. D. Priestley, I De Looze, M. J. Barlow
Summary: In the diffuse interstellar medium, small grains grow by efficiently accreting positively charged ions until they become positively charged and growth is halted. Gas-phase depletions are significantly overestimated when assuming a constant grain size distribution under diffuse ISM conditions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
L. Vacher, J. Chluba, J. Aumont, A. Rotti, L. Montier
Summary: The modeling and removal of foregrounds is a major challenge in the search for inflation signals in the cosmic microwave background (CMB). This work introduces a generalization of intensity moment expansion to the spin-2 field of linear polarization and demonstrates its application in modeling the frequency-dependent polarization angle.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
N. Ysard, M-A Miville-Deschenes, L. Verstraete, A. P. Jones
Summary: This study explores the origin of AME outside the Galactic Plane, and finds that nano-carbon dust can explain all the observations, while nano-silicates are excluded as the sole source of AME.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. P. Jones, N. Ysard
Summary: This study aims to derive optical constants and properties of nano-diamonds for modeling their existence and viability in various astronomical sources. The results indicate that nano-diamonds could be abundant in the interstellar medium (ISM) but remain undetectable.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. P. Jones
Summary: The aim of the study is to determine the sizes and shapes of nano-diamonds by observing the ratio of their CH2 and CH infrared bands. The results show that the size and shape of nano-diamonds strongly affect this ratio. It is difficult to determine the size of nano-diamonds solely based on the 3-4 μm spectra.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Bianchi, M. Murgia, A. Melis, V Casasola, F. Galliano, F. Govoni, A. P. Jones, S. C. Madden, R. Paladino, F. Salvestrini, E. M. Xilouris, N. Ysard
Summary: This study observed four nearby spiral galaxies with the aim of detecting anomalous microwave emission (AME). The results showed no clear detection of AME, but were consistent with previous studies. The study suggests further searching for AME in galaxies with relatively low radio luminosity.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Shijie Wang, Kazuhiro D. Kanagawa, Yasushi Suto
Summary: Recent ALMA observations have identified various dust gaps in protoplanetary disks, with predictions of embedded planet masses depending on gap structures in both the dust and gas components. The study found that outer gaps are mostly dust alone, while inner gaps are more likely to be associated with a gas gap as well, indicating significant inward migration is required in the evolution of these embedded planets, which differs from observed planetary system architectures.
ASTROPHYSICAL JOURNAL
(2021)
Correction
Astronomy & Astrophysics
Toshinori Hayashi, Yasushi Suto
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Shijie Wang, Kazuhiro D. Kanagawa, Yasushi Suto
Summary: Recent ALMA observations have revealed the presence of embedded protoplanets in a large number of disk substructures, providing valuable insights into the initial configurations and long-term orbital stability of these planetary systems. The results indicate that the disk-stage evolution and final configurations are influenced by initial mass assignments and viscosity. Moreover, it is found that strong perturbation sources like stellar flybys are required to drive the planetary system unstable after the disk stage.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Yasushi Suto, Shin Sasaki, Yuta Nakagawa, Othman Benomar
Summary: We present an analytic model for interpreting the photometric variation of stars and discuss the feasibility of recovering the properties of starspots and differential rotation parameters through periodogram analysis. The model is particularly important for interpreting Kepler data and future space missions, as well as photometric modulations induced by rotation of various astronomical objects.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2022)
Article
Astronomy & Astrophysics
Toshinori Hayashi, Alessandro A. Trani, Yasushi Suto
Summary: This study explores the stability of hierarchical triple systems through direct N-body simulations, revealing that coplanar retrograde triple systems are more stable. It also estimates the disruption timescales of triple systems meeting stability criteria, showing high sensitivity to small changes in initial parameters. The relationship between mutual inclination and disruption timescales can be explained by an energy transfer model and a random walk model.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Yuting Lu, Othman Benomar, Shoya Kamiaka, Yasushi Suto
Summary: We analyzed the rotation periods of 92 Kepler solar-like main-sequence stars using intensity variability analyses and asteroseismic analysis. We found that the photometrically estimated rotation periods are often simplified characterizations of the true stellar rotation periods, especially in the presence of latitudinal differential rotation.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Yasushi Suto, Shin Sasaki, Masataka Aizawa, Kotaro Fujisawa, Kazumi Kashiyama
Summary: We have developed a general framework to compute photometric variations caused by the oblique rotation of a star with an axisymmetric inhomogeneous surface. We applied this framework to compute light curves of white dwarfs, using two simple models for their surface inhomogeneity. The resulting light curve deviates from a purely sinusoidal curve, depending on the surface model and the location of the observer.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2023)
Article
Astronomy & Astrophysics
Yuta Nakagawa, Takanori Kodama, Masaki Ishiwatari, Hajime Kawahara, Yasushi Suto, Yoshiyuki O. Takahashi, George L. Hashimoto, Kiyoshi Kuramoto, Kensuke Nakajima, Shin-ichi Takehiro, Yoshi-Yuki Hayashi
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Toshinori Hayashi, Yasushi Suto
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Shijie Wang, Kazuhiro D. Kanagawa, Toshinori Hayashi, Yasushi Suto
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Toshinori Hayashi, Shijie Wang, Yasushi Suto
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Yasushi Suto, Shoya Kamiaka, Othman Benomar
ASTRONOMICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Shoya Kamiaka, Othman Benomar, Yasushi Suto, Fei Dai, Kento Masuda, Joshua N. Winn
ASTRONOMICAL JOURNAL
(2019)
Meeting Abstract
Oncology
T. Nakamura, M. Ikeda, S. Shibata, Y. Kon, K. Konuma, T. Sanada, H. Gonda, Y. Suto, K. Kobayashi, H. Tamura, M. Kobayashi, A. Hasegawa, Y. Amagasa, A. Suzuki, M. Fukuda, C. Aoyagi, N. Matsuura, Y. Kawashima, M. Shimura, N. Takita
ANNALS OF ONCOLOGY
(2018)
Article
Astronomy & Astrophysics
Shutaro Ueda, Tetsu Kitayama, Masamune Oguri, Eiichiro Komatsu, Takuya Akahori, Daisuke Iono, Takumi Izumi, Ryohei Kawabe, Kotaro Kohno, Hiroshi Matsuo, Naomi Ota, Yasushi Suto, Shigehisa Takakuwa, Motokazu Takizawa, Takahiro Tsutsumi, Kohji Yoshikawa
ASTROPHYSICAL JOURNAL
(2018)