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Article
Astronomy & Astrophysics
E. Quintin et al.
Summary: Researchers have discovered a new candidate quasi-periodic eruption (QPE) source, AT 2019vcb, with X-ray properties indicative of QPE. Observations showed significant changes in temperature and luminosity, strengthening the observational link between transient events and QPEs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
G. Miniutti et al.
Summary: X-ray quasi-periodic eruptions (QPEs) are intense repeating soft X-ray bursts from the nuclei of nearby galaxies. The physical origin of QPEs is still unknown, and various theoretical models have been proposed. In this study, the authors present observation results of QPEs in the galactic nucleus GSN 069 and investigate their spectral properties. They find that QPEs can either represent an additional emission component or the transient evolution of the disc emission. The reappearance of QPEs reveals an Eddington luminosity threshold for their presence.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Itai Linial et al.
Summary: We discuss the formation and evolution of systems composed of a low-mass main-sequence star orbiting a supermassive black hole. We argue that the resulting mass transfer is likely unstable and can produce recurring flares similar to quasiperiodic eruptions.
ASTROPHYSICAL JOURNAL
(2023)
Review
Physics, Particles & Fields
Pau Amaro-Seoane et al.
Summary: The Laser Interferometer Space Antenna (LISA) is an innovative experiment for gravitational wave astronomy, offering unique opportunities to address key astrophysical questions in a novel way. By synergizing with ground-based and space-born instruments, LISA enables multi-messenger observations, enhancing its discovery potential. This review highlights the extensive landscape of astrophysical theory, numerical simulations, and astronomical observations necessary for modeling and interpreting LISA's upcoming datastream. It also discusses open issues, gaps in understanding, and potential research avenues that LISA can contribute to in combination with electromagnetic domain studies.
LIVING REVIEWS IN RELATIVITY
(2023)
Article
Astronomy & Astrophysics
Mauri J. Valtonen et al.
Summary: The bright blazar OJ 287 shows high brightness flares, which are believed to be caused by the impact of a secondary supermassive black hole (SMBH) on the accretion disc of a more massive primary SMBH in a binary system. These flares occur at predicted times based on a modified Kepler equation inspired by general relativity. The 26th flare in 2022 breaks the usual pattern of two impact flares per 12-year cycle. The arrival time of this flare is sensitive to the level of the primary SMBH's accretion disc. Evidence of pre-flare activity is explored through spectral and polarimetric data from 2004/05 and 2021/22.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
G. Miniutti et al.
Summary: GSN 069 is the first galactic nucleus where quasi-periodic eruptions (QPEs) have been identified. These QPEs are high-amplitude, soft X-ray bursts that recur every approximately 9 hours and last for about 1 hour. The X-ray spectral properties and long-term evolution of GSN 069 suggest a long-lived tidal disruption event (TDE). The study provides important observational results that can inform further theoretical and numerical studies on the origin of QPEs in GSN 069. The findings also have implications for other sources where QPEs have been identified.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
T. Wevers et al.
Summary: The study reveals the presence of AGN signatures in all QPE host galaxies, indicating the significant role of a long-lived accretion flow in the QPE phenomenon. Furthermore, there is a substantial over-representation of quiescent Balmer strong galaxies among QPE hosts, which may be linked to both TDE and interacting extreme mass ratio inspiral hypotheses.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Elisa Bortolas
Summary: A tidal disruption event (TDE) occurs when a star is destroyed by the strong tidal shear of a massive black hole (MBH). The accumulation of TDE observations over the last years has revealed that post-starburst galaxies are significantly overrepresented in the sample of TDE hosts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
R. Arcodia et al.
Summary: The trigger mechanism of quasi-periodic eruptions (QPEs) is still unknown and various models have been proposed. Recent observations have shown that QPEs have unique phenomenology, including single isolated bursts and chaotic mixtures of multiple overlapping bursts. Furthermore, QPEs peak later and are broader at lower energies, and they also start earlier at lower energies. These results provide insights into the trigger mechanism and the behavior of QPEs.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Z. Y. Zhao et al.
Summary: Quasi-periodic eruptions (QPEs), a new type of X-ray burst with irregular recurrence time of several hours, have been detected from supermassive black holes (SMBHs) in galactic nuclei. The observational characteristics of QPEs, such as asymmetric light curves, have not been explained by current models. This study proposes that QPEs can be generated by Roche lobe overflows during periapsis passage of an evolved star orbiting a SMBH. Additionally, the extreme mass ratio between the SMBH and the companion star may lead to millihertz gravitational waves.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Xian Chen et al.
Summary: Extreme-mass-ratio inspirals (EMRIs) are important targets for future space-borne gravitational-wave detectors like LISA. Recent studies suggest that a population of newly discovered X-ray transients called quasiperiodic eruptions (QPEs) may consist of EMRIs. This research investigates whether LISA could detect the QPEs in the future and finds that the currently detected QPEs are too weak to be resolved by LISA. However, if the QPEs are made of eccentric WD-MBH binary systems, they could radiate gravitational waves across a wide range of frequencies, potentially impacting future searches for seed black holes and stellar-mass binary black holes.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Xin Pan et al.
Summary: In this study, a disk instability model is used to explain the quasi-periodic eruptions of GSN 069 and the effectiveness of the model is confirmed through experiments. Furthermore, it is found that the profiles of the eruptions can be changed by adjusting the parameter mu.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Luca Broggi et al.
Summary: This paper presents a computationally efficient approach to study tidal disruption events, extreme mass ratio inspirals, and direct plunges occurring around massive black holes in galactic nuclei. The study finds that the event rates decline with time and provides a simple scaling method to reproduce the time-dependent event rates. The results warn against using steady-state models and call for a more sophisticated, time-dependent treatment of the problem.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Mengye Wang et al.
Summary: This study explains the connection between quasi-periodic eruptions (QPEs) and tidal disruption events (TDEs) in the center of galaxies through a model. Based on the model estimation, the remaining time after the QPEs is only 1-2 years, after which the white dwarf (WD) will be fully disrupted.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Andrew King
Summary: This article investigates quasi-periodic eruptions (QPEs) from galaxy nuclei and argues that they are naturally explained by accretion from white dwarfs in highly eccentric orbits around central black holes, which decay through gravitational wave emission. The author suggests that ESO 243-39 HLX-1 is an earlier stage QPE source with a longer period, more extreme eccentricity, and a significantly more massive white dwarf donor. The study shows that mass transfer in QPE systems is always highly stable, contrary to recent claims in the literature, and this stability may explain the alternating long-short eruptions observed in some QPE sources. The article highlights the importance of searching for quasi-periodicities in bright low-mass galaxy nuclei.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Brian D. Metzger
Summary: We present a toy model for the thermal optical/UV/X-ray emission from tidal disruption events (TDEs). This model is compared to recent observations and shows both agreement and points of tension.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Julian H. Krolik et al.
Summary: Quasiperiodic erupters show very-large-amplitude quasiperiodic X-ray flares. The properties of their radiation suggest a model in which a main-sequence star periodically transfers mass to the black hole, leading to relativistic shocks and thermal X-rays emitting from the gas flowing away from the shock.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jingtao Xian et al.
Summary: By assuming that X-ray quasi-periodic eruptions in active galaxies are caused by star-disk collisions, researchers used a full relativistic method to show that the orbital parameters of the star and the characteristics of the massive black hole can be revealed through the time of arrival of the eruptions. This model was applied to observed eruptions in GSN069, revealing that the star is in a near-circular orbit.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Rebecca G. Martin et al.
Summary: This passage describes how Type I Be/X-ray binary outbursts are driven by mass transfer from a Be star decretion disk to a neutron star companion, and in some cases nonperiodic Type I outbursts may occur.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Joheen Chakraborty et al.
Summary: X-ray quasi-periodic eruptions (QPEs) are high-amplitude soft X-ray flares associated with supermassive black holes at the centers of galaxies. The cause of these flares remains uncertain, and a recent study found a fifth QPE candidate in a star-forming galaxy with a relatively low-mass nuclear black hole. The study observed QPE-like flares in soft X-rays and corresponding dips in the UV light curves, shedding light on the behavior and properties of QPEs in different galaxies.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
A. Raj et al.
Summary: Accretion disks around black holes can become warped and unstable, leading to a dynamic and variable accretion flow. Recent studies have shown that strongly warped disks may break into discrete rings, causing observable fluctuations in the accretion process.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Adam Ingram et al.
Summary: The study explores a gravitational self-lensing binary supermassive black hole model to explain the observed X-ray flares from two low-mass active galactic nuclei. The model reveals behaviors of self-lensing binary systems and suggests features that can be searched for in future X-ray and optical surveys. Discovery of such features would provide very strong evidence for the presence of a supermassive binary system.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
R. Arcodia et al.
Summary: Research findings suggest that X-ray quasi-periodic eruptions detected from two previously inactive galaxies may be caused by an orbiting compact object.
Article
Astronomy & Astrophysics
Petra Sukova et al.
Summary: This study investigates how the passage of a star can influence the gaseous environment of a supermassive black hole, finding that a quasi-stationary inflow can be temporarily inhibited by a transiting star and plasmoids can be ejected along the magnetic field lines. By observing the power spectrum of accretion variability, there is potential for multi-messenger detection of these transient events.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Erica Hammerstein et al.
Summary: By studying the properties of galaxies hosting the first 19 tidal disruption events detected by the Zwicky Transient Facility (ZTF), it was found that the sample of TDE hosts is dominated by compact green valley galaxies, with concentrated red sequence galaxies not producing TDEs at elevated levels. The overrepresentation of E + A galaxies in the ZTF sample can be fully explained when considering the masses, colors, and Sersic indices of the TDE hosts. The combination of both green colors and high Sersic index in typical TDE host galaxies could be due to a temporary enhancement in TDE rate following a merger leading to a higher central concentration of stars.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Margherita Giustini et al.
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(2020)
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K. Decker French et al.
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(2012)
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(2009)
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S Nayakshin et al.
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P Kroupa
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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