M. Spera
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View article: Assembling GW231123 in Star Clusters through the Combination of Stellar Binary Evolution and Hierarchical Mergers
Assembling GW231123 in Star Clusters through the Combination of Stellar Binary Evolution and Hierarchical Mergers Open
GW231123 is the most massive binary black hole (BBH) merger detected to date by the LIGO–Virgo–KAGRA collaboration. With at least one black hole (BH) in the upper mass gap and both BHs exhibiting high spins ( χ 1,2 ≳ 0.8), this event chall…
View article: Accelerating Gravitational N-Body Simulations Using the RISC-V-Based Tenstorrent Wormhole
Accelerating Gravitational N-Body Simulations Using the RISC-V-Based Tenstorrent Wormhole Open
Although originally developed primarily for artificial intelligence workloads, RISC-V-based accelerators are also emerging as attractive platforms for high-performance scientific computing. In this work, we present our approach to accelera…
View article: Data for "Assembling GW231123 in star clusters through the combination of stellar binary evolution and hierarchical mergers"
Data for "Assembling GW231123 in star clusters through the combination of stellar binary evolution and hierarchical mergers" Open
This repository contains the catalogues used for the low-spin analysis in the paper "Assembling GW231123 in star clusters through the combination of stellar binary evolution and hierarchical mergers". Each catalogue contains the binary bla…
View article: Enhanced mass loss of very massive stars: Impact on the evolution, binary processes, and remnant mass spectrum
Enhanced mass loss of very massive stars: Impact on the evolution, binary processes, and remnant mass spectrum Open
Very massive stars (VMS) play a fundamental role in astrophysics. Their powerful stellar winds, which dictate their evolution, supernovae, and fate as black holes (BHs), are a key uncertainty, as evidence suggests their mass-loss rates may…
View article: <tt>StAGE</tt>: Stellar Archaeology-driven Galaxy Evolution
StAGE: Stellar Archaeology-driven Galaxy Evolution Open
We build a semiempirical framework of galaxy evolution (dubbed StAGE ) firmly grounded on stellar archaeology. The latter provides data-driven prescriptions that, on a population statistical ground, allow us to define the age and the star …
View article: The more accurately the metal-dependent star formation rate is modeled, the larger the predicted excess of binary black hole mergers
The more accurately the metal-dependent star formation rate is modeled, the larger the predicted excess of binary black hole mergers Open
As the number of gravitational wave detections grows, the merger rate of binary black holes (BBHs) can help us to constrain their formation, the properties of their progenitors, and their birth environment. Here, we aim to address the impa…
View article: StAGE: Stellar Archaeology-driven Galaxy Evolution
StAGE: Stellar Archaeology-driven Galaxy Evolution Open
We build a semi-empirical framework of galaxy evolution (dubbed StAGE) firmly grounded on stellar archaeology. The latter provides data-driven prescriptions that, on a population statistical ground, allow to define the age and the star for…
View article: A new prescription for the spectral properties of population III stellar populations
A new prescription for the spectral properties of population III stellar populations Open
We investigated various emission properties of extremely low metallicity stellar populations in the Epoch of Reionization (EoR), using the new GALSEVN model, which has shown promising agreement between spectral predictions and observations…
View article: The initial mass-remnant mass relation for core collapse supernovae
The initial mass-remnant mass relation for core collapse supernovae Open
Context. The first direct detection of gravitational waves in 2015 marked the beginning of a new era for the study of compact objects. Upcoming detectors, such as the Einstein Telescope, are expected to add thousands of binary coalescences…
View article: A new prescription for the spectral properties of population III stellar populations
A new prescription for the spectral properties of population III stellar populations Open
We investigated various emission properties of extremely low metallicity stellar populations in the Epoch of Reionization (EoR), using the new GALSEVN model, which has shown promising agreement between spectral predictions and observations…
View article: The initial mass-remnant mass relation for core collapse supernovae
The initial mass-remnant mass relation for core collapse supernovae Open
The first direct detection of gravitational waves in 2015 marked the beginning of a new era for the study of compact objects. Upcoming detectors, such as the Einstein Telescope, are expected to add thousands of binary coalescences to the l…
View article: The more accurately the metal-dependent star formation rate is modeled, the larger the predicted excess of binary black hole mergers
The more accurately the metal-dependent star formation rate is modeled, the larger the predicted excess of binary black hole mergers Open
As the number of gravitational-wave detections grows, the merger rate of binary black holes (BBHs) can help us to constrain their formation, the properties of their progenitors, and their birth environment. Here, we aim to address the impa…
View article: Constraining the Initial Mass Function via Stellar Transients
Constraining the Initial Mass Function via Stellar Transients Open
The stellar initial mass function (IMF) represents a fundamental quantity in astrophysics and cosmology describing the mass distribution of stars from low mass all the way up to massive and very massive stars. It is intimately linked to a …
View article: Constraining the Initial-Mass Function via Stellar Transients
Constraining the Initial-Mass Function via Stellar Transients Open
The stellar initial-mass function (IMF) represents a fundamental quantity in astrophysics and cosmology, describing the mass distribution of stars from low to very-high masses. It is intimately linked to a wide variety of topics, including…
View article: The cosmic rate of pair-instability supernovae
The cosmic rate of pair-instability supernovae Open
Pair-instability supernovae (PISNe) have crucial implications for many astrophysical topics, including the search for very massive stars, the black hole mass spectrum, and galaxy chemical enrichment. To this end, we need to understand wher…
View article: The boring history of <i>Gaia</i> BH3 from isolated binary evolution
The boring history of <i>Gaia</i> BH3 from isolated binary evolution Open
Gaia BH3 is the first observed dormant black hole (BH) with a mass of ≈30 M ⊙ , and it represents the first confirmation that such massive BHs are associated with metal-poor stars. Here, we explore the isolated binary formation channel for…
View article: Nebular emission from young stellar populations including binary stars
Nebular emission from young stellar populations including binary stars Open
We investigate the nebular emission produced by young stellar populations using the new galsevn model based on the combination of the sevn population-synthesis code including binary-star processes and the galaxev code for the spectral evol…
View article: Astrophysical and Cosmological Relevance of the High-Frequency Features in the Stochastic Gravitational-Wave Background
Astrophysical and Cosmological Relevance of the High-Frequency Features in the Stochastic Gravitational-Wave Background Open
The stochastic gravitational-wave background (SGWB) produced by merging neutron stars exhibits a peak in the kHz band. In this paper, we develop a theoretical framework to exploit this distinctive feature through a Markov Chain Monte Carlo…
View article: Compact object mergers: exploring uncertainties from stellar and binary evolution with <scp>sevn</scp>
Compact object mergers: exploring uncertainties from stellar and binary evolution with <span>sevn</span> Open
Population-synthesis codes are an unique tool to explore the parameter space of massive binary star evolution and binary compact object (BCO) formation. Most population-synthesis codes are based on the same stellar evolution model, limitin…
View article: Binary neutron star populations in the Milky Way
Binary neutron star populations in the Milky Way Open
Galactic binary neutron stars (BNSs) are a unique laboratory to probe the evolution of BNSs and their progenitors. Here, we use a new version of the population synthesis code SEVN to evolve the population of Galactic BNSs, by modeling the …
View article: SEVN parameter file from the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023
SEVN parameter file from the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023 Open
The repository contains the runtime parameters used in the SEVN simulations analysed in the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023. Repository content: - used_params_Sgallet…
View article: SEVN parameter file from the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023
SEVN parameter file from the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023 Open
The repository contains the runtime parameters used in the SEVN simulations analysed in the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023. Repository content: - used_params_Sgallet…
View article: Isolated and dynamical black hole mergers with<tt>B-POP</tt>: the role of star formation and dynamics, star cluster evolution, natal kicks, mass and spins, and hierarchical mergers
Isolated and dynamical black hole mergers withB-POP: the role of star formation and dynamics, star cluster evolution, natal kicks, mass and spins, and hierarchical mergers Open
The current interpretation of LIGO–Virgo–KAGRA data suggests that the primary mass function of merging binary black holes (BBHs) at redshift z ≲ 1 contains multiple structures, while spins are relatively low. Theoretical models of BBH form…
View article: Compact object mergers: exploring uncertainties from stellar and binary evolution with SEVN
Compact object mergers: exploring uncertainties from stellar and binary evolution with SEVN Open
Population-synthesis codes are an unique tool to explore the parameter space of massive binary star evolution and binary compact object (BCO) formation. Most population-synthesis codes are based on the same stellar evolution model, limitin…
View article: Growing Black Holes through Successive Mergers in Galactic Nuclei: I. Methods and First Results
Growing Black Holes through Successive Mergers in Galactic Nuclei: I. Methods and First Results Open
We present a novel, few-body computational framework designed to shed light on the likelihood of forming intermediate-mass (IM) and supermassive (SM) black holes (BHs) in nuclear star clusters (NSCs) through successive BH mergers, initiate…
View article: The Black Hole Mass Function across Cosmic Time. II. Heavy Seeds and (Super)Massive Black Holes
The Black Hole Mass Function across Cosmic Time. II. Heavy Seeds and (Super)Massive Black Holes Open
This is the second paper in a series aimed at modeling the black hole (BH) mass function from the stellar to the (super)massive regime. In the present work, we focus on (super)massive BHs and provide an ab initio computation of their mass …
View article: Compact Binary Coalescences: Astrophysical Processes and Lessons Learned
Compact Binary Coalescences: Astrophysical Processes and Lessons Learned Open
On 11 February 2016, the LIGO and Virgo scientific collaborations announced the first direct detection of gravitational waves, a signal caught by the LIGO interferometers on 14 September 2015, and produced by the coalescence of two stellar…
View article: Modeling gravitational few-body problems with TSUNAMI and OKINAMI
Modeling gravitational few-body problems with TSUNAMI and OKINAMI Open
In recent years, an increasing amount of attention is being paid to the gravitational few-body problem and its applications to astrophysical scenarios. Among the main reasons for this renewed interest there is large number of newly discove…
View article: Revisiting Common Envelope Evolution -- A New Semi-Analytic Model for N-body and Population Synthesis Codes
Revisiting Common Envelope Evolution -- A New Semi-Analytic Model for N-body and Population Synthesis Codes Open
We present a novel way of modeling common envelope evolution in binary and few-body systems. We consider the common envelope inspiral as driven by a drag force with a power-law dependence in relative distance and velocity. The orbital moti…
View article: Impact of very massive stars on the chemical evolution of extremely metal-poor galaxies
Impact of very massive stars on the chemical evolution of extremely metal-poor galaxies Open
Context. In recent observations of extremely metal-poor, low-mass, starburst galaxies, almost solar Fe/O ratios are reported, despite N/O ratios consistent with the low metallicity. Aims. We aim to investigate if the peculiar Fe/O ratios c…