535 citations · 1.9k across the 42 of their papers we have counts for
42 papers
No Surviving Companion to the Galactic SN 1181: Evidence for a Double-Degenerate Channel for Type Iax Supernovae
Kohki Uno, Daichi Tsuna, Daichi Hiramatsu +2
Type Iax supernovae (SNe Iax) are the recently-established, yet peculiar subclass of thermonuclear supernovae, whose progenitor systems and explosion mechanisms remain debated. A l…
Impact of Spin Priors on the Population Inference of Merging Binary Black Holes
Kazuya Kobayashi, Masaki Iwaya, Soichiro Morisaki +2
The spins of merging binary black holes (BBHs) inferred from gravitational-wave (GW) observations provide key insights into their formation channels. However, spin parameters are t…
Population Synthesis Study on the Binary Origin of Type Ibn Supernovae
Takatoshi Ko, Tomoya Kinugawa, Daichi Tsuna +2
Type Ibn supernovae (SNe) are a class of SN explosions whose progenitors are surrounded by dense helium-rich circumstellar matter (CSM). Some models have been proposed for how to f…
The diffuse supernova neutrino background: an update with modern population synthesis and core-collapse simulations
Cecilia Lunardini, Tomoya Takiwaki, Tomoya Kinugawa +2
We present a new, state-of-the-art computation of the Diffuse Supernova Neutrino Background (DSNB), where we use neutrino spectra from multi-dimensional, multi-second core collapse…
An analytical joint prior for effective spins for inference on the spin distribution of binary black holes
Masaki Iwaya, Kazuya Kobayashi, Soichiro Morisaki +2
We derive an analytical form of the joint prior of effective spin parameters, and , assuming an isotropic and uniform-in-magnitude spin distribution.…
Hidden in Pixels. I. Discovery of dual "little red dots" indicates excess clustering on kilo-parsec scales
Takumi S. Tanaka, John D. Silverman, Kazuhiro Shimasaku +56
``Little Red Dots'' (LRDs) are an abundant high-redshift population newly discovered by the James Webb Space Telescope (JWST) and considered to be an early growth phase of supermas…
Constraint on the progenitor of binary black hole merger using Population III star formation channel
Masaki Iwaya, Tomoya Kinugawa, Hideyuki Tagoshi
The observations of gravitational waves have revealed the existence of black holes above . A variety of channels have been proposed as their origin, including the Popul…
Fate of supernova progenitors in massive binary systems
Tomoya Kinugawa, Shunsaku Horiuchi, Tomoya Takiwaki +1
How massive stars end their lives depends on the core mass, core angular momentum, and hydrogen envelopes at death. However, these key physical facets of stellar evolution can be s…
Mass Ratio of Binary Black Holes Determined from LIGO/Virgo Data Restricted to Small False Alarm Rate
Tomoya Kinugawa, Takashi Nakamura, Hiroyuki Nakano
We focus on gravitational-wave events of binary black-hole mergers up to the third observing run with the minimum false alarm rate smaller than . These even…
Merger Conditions of Population III Protostar Binaries
Takanobu Kirihara, Hajime Susa, Takashi Hosokawa +1
Massive close binary stars with extremely small separations have been observed, and they are possible progenitors of gravitational-wave sources. The evolution of massive binaries i…
On the population III binary black hole mergers with intermediate mass black holes: dependence on common envelope parameter
Kotaro Hijikawa, Tomoya Kinugawa, Ataru Tanikawa +2
The current gravitational wave (GW) detectors have successfully observed many binary compact objects, and the third generation ground-based GW detectors such as Einstein telescope…
Search for a Black Hole Binary in Gaia DR3 Astrometric Binary Stars with Spectroscopic Data
Ataru Tanikawa, Kohei Hattori, Norita Kawanaka +3
We report the discovery of a candidate binary system consisting of a black hole (BH) and a red giant branch star from the Gaia DR3. This binary system is discovered from 64108 bina…
Can Population III stars be major origins of both merging binary black holes and extremely metal poor stars?
Ataru Tanikawa, Gen Chiaki, Tomoya Kinugawa +2
Population (Pop) III stars, first stars, or metal-free stars are made of primordial gas. We have examined if they can be dominant origins of merging binary black holes (BHs) and ex…
Constraints on Population I/II neutron star-black hole binary formation by gravitational wave and radio observations
Tomoya Kinugawa, Takashi Nakamura, Hiroyuki Nakano
Two neutron star (NS)-black hole (BH) binaries, GW200105 and GW200115 found in the LIGO/Virgo O3b run have smaller BH mass of 6--9\, which is consistent with Population…
Merger rate density of binary black holes through isolated Population I, II, III and extremely metal-poor binary star evolution
Ataru Tanikawa, Takashi Yoshida, Tomoya Kinugawa +4
We investigate the formation of merging binary black holes (BHs) through isolated binary evolution, performing binary population synthesis calculations covering an unprecedentedly…
On the population III binary black hole mergers beyond the pair-instability mass gap
Kotaro Hijikawa, Ataru Tanikawa, Tomoya Kinugawa +2
We perform a binary population synthesis calculation incorporating very massive population (Pop.) III stars up to 1500 , and investigate the nature of binary black hole (B…
Gravitational waves from Population III binary black holes are consistent with LIGO/Virgo O3a data for the chirp mass larger than
Tomoya Kinugawa, Takashi Nakamura, Hiroyuki Nakano
The probability number distribution function of binary black hole mergers observed by LIGO/Virgo O3a has double peaks as a function of chirp mass , total mass , primary b…
Impact of binary interactions on the diffuse supernova neutrino background
Shunsaku Horiuchi, Tomoya Kinugawa, Tomoya Takiwaki +2
Binary interactions, especially mass transfer and mergers, can strongly influence the evolution of massive stars and change their final properties and the occurrence of supernovae.…
Population III Binary Black Holes: Effects of Convective Overshooting on Formation of GW190521
Ataru Tanikawa, Tomoya Kinugawa, Takashi Yoshida +2
GW190521 is a merger of two black holes (BHs), wherein at least one BH lies within the pair-instability (PI) mass gap, and it is difficult to form because of the effects of PI supe…
Formation of Binary Black Holes Similar to GW190521 with a Total Mass of from Population III Binary Star Evolution
Tomoya Kinugawa, Takashi Nakamura, Hiroyuki Nakano
In the case of zero-metal (population III or Pop III) stars, we show that the total mass of binary black holes from binary Pop III star evolution can be , whi…
Merger rate density of Population III binary black holes below, above, and in the pair-instability mass gap
Ataru Tanikawa, Hajime Susa, Takashi Yoshida +2
We present the merger rate density of Population (Pop.) III binary black holes (BHs) by means of a widely-used binary population synthesis code BSE with extensions to very massive…
Formation of mass gap compact object and black hole binary from Population III stars
Tomoya Kinugawa, Takashi Nakamura, Hiroyuki Nakano
We performed population synthesis simulations of Population III binary stars with Maxwellian kick velocity distribution when MGCOs (Mass Gap Compact Objects with mass 2--5$\,M_{\od…
Chirp Mass and Spin of Binary Black Holes from First Star Remnants
Tomoya Kinugawa, Takashi Nakamura, Hiroyuki Nakano
We performed Population III (Pop III) binary evolution by using population synthesis simulations for seven different models. We found that Pop III binaries tend to be binary black…
Formation rate of LB-1-like systems through dynamical interactions
Ataru Tanikawa, Tomoya Kinugawa, Jun Kumamoto +1
We estimate formation rates of LB-1-like systems through dynamical interactions in the framework of the theory of stellar evolution before the discovery of the LB-1 system. The LB-…