Article
Astronomy & Astrophysics
C. Maitra, F. Haberl, G. Vasilopoulos, L. Ducci, K. Dennerl, S. Carpano
Summary: In this study, the X-ray properties of the supergiant HMXB XMMU J053108.3-690923 in the Large Magellanic Cloud were investigated. The source was confirmed to exhibit pulsations and extreme variability, with flares seen in the eROSITA light curves. This provides direct evidence of an SFXT exhibiting a high dynamic range in luminosity and fast flaring behavior.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
E. Bozzo, L. Ducci, M. Falanga
Summary: This paper presents a semi-analytical treatment of the accretion process in wind-fed neutron star supergiant X-ray binaries with eccentric orbits. The study includes calculations of photoionization of the stellar wind by X-rays from the accreting NS and modulation of mass accretion rate induced by eccentric orbit. It is suggested that the bimodality of low- and high-X-ray luminosity solutions in supergiant X-ray binaries is likely due to the NS approaching and moving away from the companion without coexisting simultaneously.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
K. M. Rajwade, J. van den Eijnden
Summary: Recent observations suggest that repeating FRBs may originate from binary systems with a highly energetic neutron star and a massive companion star. We investigated the host galaxy properties, binary formation rates, rotation and dispersion measure evolution, birth site offsets, and the origin of persistent radio emission. The results indicate a preference for neutron star-massive star binary systems in host galaxies, but more discoveries and localizations are needed for conclusive evidence. The birth rate of considered binaries significantly exceeds the estimated rate of FRBs, suggesting that only a small subset of these systems produce FRBs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Felipe Navarete, Augusto Damineli, Aura E. Ramirez, Danilo F. Rocha, Leonardo A. Almeida
Summary: This study used photometric and astrometric data from Gaia Early Data Release 3 to determine the distance of Westerlund 1 star cluster as 4.06(-0.34)(+0.36) kpc and derived an age of 10.7 +/- 1 Myr for the cluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Erin R. Higgins, Jorick S. Vink
Summary: The traditional method of determining stellar ages using isochrone fitting of standardized grids of models has many systematic uncertainties. This study proposes a new method utilizing the mass-luminosity (M-L) plane and mixing-corrected models, providing more accurate estimates of stellar ages. The results show discrepancies in the spectroscopic masses of O supergiants and suggest that most B supergiants are still burning hydrogen in their cores.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Amy H. Knight, Adam Ingram, Matthew Middleton, Jeremy Drake
Summary: Determining the maximum possible neutron star mass helps to constrain the equation of state of ultra-dense matter. By analyzing X-ray eclipses in a low-mass X-ray binary, it is found that the companion star may be experiencing outer layer ablation, suggesting a transition into a redback millisecond pulsar. The derived mass ratio, inclination, and radial velocity measurements support a hard equation of state, but considering other emission lines, a canonical neutron star mass is also possible.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Danilo F. Rocha, Leonardo A. Almeida, Augusto Damineli, Felipe Navarete, Michael Abdul-Masih, Gregory N. Mace
Summary: Westerlund 1 (Wd 1) is an important star cluster for studying massive star formation. By modeling the eclipsing binary W36, it was found that it is hotter and more luminous than previously thought. The distance of W36 was calculated and found to agree with other recent distance measurements. This study suggests that Wd 1 has experienced multiple episodes of star formation, similar to the R136/30 Dor LMC cluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Federico A. Fogantini, Federico Garcia, Jorge A. Combi, Sylvain Chaty
Summary: The study aims to investigate the geometrical and physical properties of stellar wind structures formed by the interaction between the compact object and the supergiant star. The XMM-Newton light curves show that the source hardens during the eclipse, and a reduced pulse modulation is observed on the ingress to the eclipse. By analyzing the spectral analysis, a scenario is proposed where a photo-ionization wake and an accretion wake are responsible for the absorption column, continuum emission, and variability seen at the Fe-line complex.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
F-X Li, S-B Qian, J. Zhang, L-Y Zhu, E-G Zhao, W-P Liao
Summary: Based on the analysis of light curves and spectra from TESS, we have determined that V375 Cas is a semidetached binary undergoing mass transfer and a third body is causing cyclic variations. This discovery is significant for understanding stellar structures and evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
John Antoniadis, David R. Aguilera-Dena, Alejandro Vigna-Gomez, Michael Kramer, Norbert Langer, Bernhard Mueller, Thomas M. Tauris, Chen Wang, Xiao-Tian Xu
Summary: The first three observing runs with Advanced LIGO and Virgo have detected binary black hole mergers with highly unequal mass components, challenging traditional formation paradigms. Researchers propose a new mechanism suggesting that stars with pre-collapse carbon-oxygen core masses above 10 solar masses may produce highly asymmetric binary systems, such as GW190814. Examples of specific evolutionary channels leading to the formation of GW190814 and GW200210 are presented. The estimated merger-rate density of these events in this scenario is around 5% of the total binary black hole merger rate.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Alejandro Vigna-Gomez, Michelle Wassink, Jakub Klencki, Alina Istrate, Gijs Nelemans, Ilya Mandel
Summary: Binary neutron stars undergo a common-envelope phase in their evolution, where the envelope of a giant star engulfs the whole binary system, but can be ejected through energy transfer. This study investigates the final stages of the common-envelope phase using one-dimensional single stellar evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Mauro Sereno, Lorenzo Lovisari, Weiguang Cui, Gerrit Schellenberger
Summary: Research shows that massive galaxy clusters in the observed universe achieved an advanced thermal equilibrium around 1.8 billion years ago, influenced by the matching densities of matter and dark energy in the universe. From a statistical sample, it is found that the efficiency of hot gas in converting kinetic energy to thermal energy increases with time, as measured by X-ray observations within clusters. The evolution of hot gas is strongly linked to cosmic structure formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rita Lau
Summary: It has been discovered that the beta+decay rates and neutrino loss rates of Ga-64 and Se-68 greatly affect the light curves and final abundances of X-ray bursts. By comparing the results with observations, it was found that the modified beta decay rates of Ga-64 produce a light curve more comparable to observations. The beta-Fdecay rate and neutrino loss rate of Se-68 greatly modify the final mass fractions of the ashes of the X-ray bursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
N. N. Shchechilin, M. E. Gusakov, A. Chugunov
Summary: This study presents the first thermodynamically consistent calculations of crustal heating for realistic compositions of thermonuclear ashes, taking into account neutron superfluidity and rapid diffusion effects. A simplified reaction network is used to model nuclear evolution, leading to a lower limit for the deep crustal heating energy release, while the actual value depends on the ash composition and used mass model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. D. Khokhriakova, S. B. Popov
Summary: Recently, several accreting neutron stars inside supernova remnants have been discovered. Their ages are much shorter than expected, which poses a puzzle for the standard magnetorotational evolution of neutron stars. By considering early fallback accretion and asymmetry in the transitions between different evolutionary stages, this study provides an explanation for the appearance of these systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V. Grinberg, K. Pottschmidt, M. Boeck, C. Schmid, M. A. Nowak, P. Uttley, J. A. Tomsick, J. Rodriguez, N. Hell, A. Markowitz, A. Bodaghee, M. Cadolle Bel, R. E. Rothschild, J. Wilms
ASTRONOMY & ASTROPHYSICS
(2014)
Article
Astronomy & Astrophysics
Brian Punsly, Jerome Rodriguez, Sergei A. Trushkin
ASTROPHYSICAL JOURNAL
(2014)
Article
Astronomy & Astrophysics
G. Marcel, F. Cangemi, J. Rodriguez, J. Neilsen, J. Ferreira, P-O Petrucci, J. Malzac, S. Barnier, M. Clavel
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
N. Dagoneau, S. Schanne, J. Rodriguez, J. -L. Atteia, B. Cordier
Summary: The SVOM mission will carry various instruments, including the coded-mask telescope ECLAIRs, to detect high-energy transients. ECLAIRs will search for new X-ray sources and peculiar behavior from known sources, utilizing an onboard source catalogue to distinguish between known and new sources.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
John A. Tomsick, Benjamin M. Coughenour, Jeremy Hare, Roman Krivonos, Arash Bodaghee, Sylvain Chaty, Maica Clavel, Francesca M. Fornasini, Jerome Rodriguez, Aarran W. Shaw
Summary: Through observations with the Chandra X-ray Observatory, we confirmed the specific locations of six 17-60 keV sources and classified them, with four identified as magnetic cataclysmic variables and one classified as a likely active galactic nucleus. The other two sources are likely transient, highly variable, or highly absorbed.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
J. Ferreira, G. Marcel, P. -O. Petrucci, J. Rodriguez, J. Malzac, R. Belmont, M. Clavel, G. Henri, S. Corbel, M. Coriat
Summary: This study proposes a new explanation for LFQPOs in black hole X-ray binaries, suggesting that they are a response of the disk to instabilities triggered in the jets. This scenario is consistent with observational results and the overall behavior of black hole binaries.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Arash Bodaghee, Vallia Antoniou, Andreas Zezas, John A. Tomsick, Zachary Jordan, Brenton Jackson, Ryan Agnew, Eric Frechette, Ann E. Hornschemeier, Jerome Rodriguez
Summary: In the Small Magellanic Cloud, a significant spatial correlation was found between observed high-mass X-ray binaries (HMXBs) and OB associations (OBAs). It is inferred that the average kick velocity inherited by an HMXB during the formation of its compact object is 2-34 km/s, considerably lower than their counterparts in the Milky Way. This suggests that the galactic environment has an impact on setting the average kick velocity of HMXBs.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
S. E. Motta, J. Rodriguez, E. Jourdain, M. Del Santo, G. Belanger, F. Cangemi, V. Grinberg, J. J. E. Kajava, E. Kuulkers, J. Malzac, K. Pottschmidt, J. P. Roques, C. Sanchez-Fernandez, J. Wilms
Summary: This paper focuses on the research of black hole binaries using data from the ESA mission INTEGRAL. Through a review of 18 years of observations, it highlights the latest advances in the field of black hole binaries and emphasizes the significant contributions of INTEGRAL to this area of study.
NEW ASTRONOMY REVIEWS
(2021)
Article
Astronomy & Astrophysics
John A. Tomsick, Arash Bodaghee, Sylvain Chaty, Maica Clavel, Francesca M. Fornasini, Jeremy Hare, Roman Krivonos, Farid Rahoui, Jerome Rodriguez
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Michael A. Nowak, Adamantia Paizis, Gaurava Kumar Jaisawal, Jerome Chenevez, Sylvain Chaty, Francis Fortin, Jerome Rodriguez, Rim Wilms
ASTROPHYSICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Peggy Varniere, Jerome Rodriguez
ASTROPHYSICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
Charith S. Peris, Ronald A. Remillard, James F. Steiner, Saeqa D. Vrtilek, Peggy Varniere, Jerome Rodriguez, Guy Pooley
ASTROPHYSICAL JOURNAL
(2016)
Article
Astronomy & Astrophysics
Jerome Rodriguez, Victoria Grinberg, Philippe Laurent, Marion Cadolle Bel, Katja Pottschmidt, Guy Pooley, Arash Bodaghee, Joern Wilms, Christian Gouiffes
ASTROPHYSICAL JOURNAL
(2015)
Article
Astronomy & Astrophysics
J. P. Halpern, J. A. Tomsick, E. V. Gotthelf, F. Camilo, C. -Y. Ng, A. Bodaghee, J. Rodriguez, S. Chaty, F. Rahoui
ASTROPHYSICAL JOURNAL LETTERS
(2014)
Article
Astronomy & Astrophysics
Chien-Ying Yang, Yi-Chi Chang, Hung-Hsiang Liang, Che-Yen Chu, Jr-Yue Hsiang, Jeng-Lun Chiu, Chih-Hsun Lin, Philippe Laurent, Jerome Rodriguez, Hsiang-Kuang Chang
ASTRONOMICAL JOURNAL
(2020)