60 citations · 521 across the 29 of their papers we have counts for
29 papers
Examining Neutrino-Matter Interactions in the Cassiopeia A Supernova
Toshiki Sato, Takashi Yoshida, Hideyuki Umeda +4
Neutrino interactions with stellar material are widely believed to be fundamental to the explosion of massive stars. However, this important process has remained difficult to confi…
Richardson-Lucy deconvolution with a spatially Variant point-spread function of Chandra: Supernova Remnant Cassiopeia A as an Example
Yusuke Sakai, Shinya Yamada, Toshiki Sato +3
Richardson-Lucy (RL) deconvolution is one of the classical methods widely used in X-ray astronomy and other areas. Amid recent progress in image processing, RL deconvolution still…
A broadband X-ray imaging spectroscopy in the 2030s: the FORCE mission
Koji Mori, Takeshi G. Tsuru, Kazuhiro Nakazawa +49
In this multi-messenger astronomy era, all the observational probes are improving their sensitivities and overall performance. The Focusing on Relativistic universe and Cosmic Evol…
Xtend, the Soft X-ray Imaging Telescope for the X-ray Imaging and Spectroscopy Mission (XRISM)
Koji Mori, Hiroshi Tomida, Hiroshi Nakajima +52
Xtend is a soft X-ray imaging telescope developed for the X-Ray Imaging and Spectroscopy Mission (XRISM). XRISM is scheduled to be launched in the Japanese fiscal year 2022. Xtend…
ASCENT - A balloon-borne hard X-ray imaging spectroscopy telescope using transition edge sensor microcalorimeter detectors
Fabian Kislat, Daniel Becker, Douglas Bennett +26
Core collapse supernovae are thought to be one of the main sources in the galaxy of elements heavier than iron. Understanding the origin of the elements is thus tightly linked to o…
The 3-D X-ray Ejecta Structure of Tycho's Supernova Remnant
Matthew J. Millard, Sangwook Park, Toshiki Sato +5
We present our velocity measurements of 59 clumpy, metal-rich ejecta knots in the supernova remnant (SNR) of SN 1572 (Tycho). We use our 450 ks Chandra High Energy Transmission Gra…
X-ray Studies of the Inverted Ejecta Layers in the Southeast Area of Cassiopeia A
Tomoya Tsuchioka, Toshiki Sato, Shinya Yamada +1
The central strong activities in core-collapse supernovae expect to produce the overturning of the Fe- and Si/O-rich ejecta during the supernova explosion based on multi-dimensiona…
Discovery of Stable Titanium at the Northeastern Jet of Cassiopeia A: Need for a Weak Jet Mechanism?
Takuma Ikeda, Yasunobu Uchiyama, Toshiki Sato +3
The origin of the jet-like structures observed in Cassiopeia A is still unclear, although it seems to be related to its explosion mechanism. X-ray observations of the characteristi…
High-entropy ejecta plumes in Cassiopeia A from neutrino-driven convection
Toshiki Sato, Keiichi Maeda, Shigehiro Nagataki +6
Recent multi-dimensional simulations suggest that high-entropy buoyant plumes help massive stars to explode. Outwardly protruding iron-rich fingers in the galactic supernova remnan…
Discovery of the Highly-Neutronized Ejecta Clump with Enhanced Abundances of Titanium and Chromium in the Type Ia Supernova Remnant 3C 397
Yuken Ohshiro, Hiroya Yamaguchi, Shing-Chi Leung +7
The supernova remnant (SNR) 3C 397 is thought to originate from a Type Ia supernova (SN Ia) explosion of a near-Chandrasekhar-mass () progenitor, based on the enhanced…
Spatially Resolved RGS Analysis of Kepler's Supernova Remnant
Tomoaki Kasuga, Jacco Vink, Satoru Katsuda +4
The distribution and kinematics of the circumstellar medium (CSM) around a supernova remnant (SNR) tell us useful information about the explosion of its natal supernova (SN). Keple…
On the origin of the asymmetry of the ejecta structure and explosion of G350.10.3
Tomoya Tsuchioka, Yasunobu Uchiyama, Ryota Higurashi +4
We present X-ray analysis of the ejecta of supernova remnant G350.10.3 observed with Chandra and Suzaku, and clarify the ejecta's kinematics over a decade and obtain a new obser…
From supernova to supernova remnant: comparison of thermonuclear explosion models
Gilles Ferrand, Donald C. Warren, Masaomi Ono +6
Progress in the three-dimensional modeling of supernovae (SN) prompts us to revisit the supernova remnant (SNR) phase. We continue our study of the imprint of a thermonuclear explo…
Formation pathway for lonely stripped-envelope supernova progenitors: implications for Cassiopeia A
Ryosuke Hirai, Toshiki Sato, Philipp Podsiadlowski +2
We explore a new scenario for producing stripped-envelope supernova progenitors. In our scenario, the stripped-envelope supernova is the second supernova of the binary, in which th…
A Sub-Solar Metallicity Progenitor for Cassiopeia A, the remnant of a Type IIb Supernova
Toshiki Sato, Takashi Yoshida, Hideyuki Umeda +7
We report, for the first time, the detection of the Mn-K line in the Type IIb supernova (SN IIb) remnant, Cassiopeia A. Manganese (Mn after decay of Co), a neutron…
A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant
Toshiki Sato, Eduardo Bravo, Carles Badenes +3
{\it Chandra} X-ray observations of Kepler's supernova remnant indicate the existence of a high speed Fe-rich ejecta structure in the southwestern region. We report strong K-shell…
A concept for the X-ray telescope system with an angular-resolution booster
Yoshitomo Maeda, Ryo Iizuka, Takayuki Hayashi +7
We present a concept of the X-ray imaging system with high angular-resolution and moderate sensitivity. In this concept, a two-dimensional detector, i.e., imager, is put at a sligh…
An Ejecta Kinematics Study of Kepler's Supernova Remnant with High-Resolution HETG Spectroscopy
Matthew J. Millard, Jayant Bhalerao, Sangwook Park +6
We report our measurements of the bulk radial velocity from a sample of small, metal-rich ejecta knots in Kepler's Supernova Remnant (SNR). We measure the Doppler shift of the He-l…
Genus Statistic Applied to the X-ray Remnant of SN 1572: Clues to the Clumpy Ejecta Structure of Type Ia Supernovae
Toshiki Sato, John P. Hughes, Brian J. Williams +1
Clumpy structures are a common feature in X-ray images of young Type Ia supernova remnants (SNRs). Although the precise origin of such clumps remains unclear there are three generi…
Asymmetric Expansion of the Fe ejecta in Kepler's Supernova Remnant
Tomoaki Kasuga, Toshiki Sato, Koji Mori +2
The ejecta kinematics of supernova remnants (SNRs) is one of crucial clues to understand the explosion mechanism of type Ia supernovae (SNe). In particular, the kinematic asymmetry…
In-flight Calibration of Hitomi Soft X-ray Spectrometer (3) Effective Area
Masahiro Tsujimoto, Takashi Okajima, Megan E. Eckart +14
We present the result of the in-flight calibration of the effective area of the Soft X-ray Spectrometer (SXS) onboard the Hitomi X-ray satellite using an observation of the Crab ne…
Inflight Calibration of the Hitomi Soft X-ray Spectrometer (2) Point Spread Function
Yoshitomo Maeda, Toshiki Sato, Takayuki Hayashi +14
We present results of inflight calibration of the point spread function (PSF) of the Soft X-ray Telescope (SXT-S) that focuses X-ray onto the pixel array of the Soft X-ray Spectrom…
Hitomi Observations of the LMC SNR N132D: Highly Redshifted X-ray Emission from Iron Ejecta
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +191
We present Hitomi observations of N132D, a young, X-ray bright, O-rich core-collapse supernova remnant in the Large Magellanic Cloud (LMC). Despite a very short observation of only…
X-ray Measurements of the Particle Acceleration Properties at Inward Shocks in Cassiopeia A
Toshiki Sato, Satoru Katsuda, Mikio Morii +5
We present new evidence that the bright non-thermal X-ray emission features in the interior of the Cassiopeia A supernova remnant (SNR) are caused by inward moving shocks based on…