M. Guolo

HLX-1 as a Repeating Partial Tidal Disruption Event around an Intermediate-Mass Black Hole

Fangyuan Yu, Andrew Mummery, Muryel Guolo

ESO 243 $-$ 49 HLX--1 is one of the first known compelling intermediate-mass black hole (IMBH) candidates, but the origin of its recurrent X-ray outbursts remains unsettled. In this…

Even a precessing clock is right twice per orbit -- The super-periods of eRO-QPE2 and challenges for quasi-periodic eruption orbital models

R. Arcodia, G. Miniutti, J. Chakraborty +25

We present O $-$ C (``observed minus calculated'') timing analysis of the quasi-periodic eruption (QPE) source eRO-QPE2 with a multi-mission X-ray campaign, which includes 32 observe…

AT2024lhc and AT2024kmq in the landscape of featureless tidal disruption events

Yuhan Yao, Ryan Chornock, Andrew Mummery +39

We study AT2024kmq and AT2024lhc, two tidal disruption events (TDEs) with blue featureless spectra associated with high-mass black holes ( $M_{BH} \sim 1 0^{8} M_{⊙}$ ). Both even…

The Wandering Supermassive Black Hole Powering the off-nuclear TDE AT2024tvd

M. Guolo, A. Mummery, S. van Velzen +11

We present an analysis of the spectral energy distribution (SED) of the off-nuclear tidal disruption event (TDE) AT2024tvd during its late-time plateau phase, combining X-ray spect…

astro-ph.HE2026★ 1 cited

Tidal disruption event rates across cosmic time: forecasts for LSST, Roman, and JWST and their constraints on the supermassive black hole mass function

Mitchell Karmen, Suvi Gezari, Colin Norman +1

Measuring the mass distribution of supermassive black holes (SMBHs) over cosmic time remains particularly challenging for the low mass (M_BH<10^8 M_sun) population at z>1. This pop…

astro-ph.HE2025★ 3 cited

Tidal disruption event Calorimetry: Observational constraints on the physics of TDE optical flares

Andrew Mummery, Brian Metzger, Sjoert van Velzen +1

Tidal disruption events are routinely discovered as bright optical/UV flares, the properties of which are now well categorized on the population level. The underlying physical proc…

astro-ph.HE2025★ 2 cited

Compact Accretion Disks in the Aftermath of Tidal Disruption Events: Parameter Inference from Joint X-ray Spectra and UV/Optical Photometry Fitting

M. Guolo, A. Mummery, S. van Velzen +8

We present a multi-wavelength analysis of 14 tidal disruption events (TDEs)-including an off-nuclear event associated with an ultra-compact dwarf galaxy-selected for having availab…

A Time-Dependent Solution for GSN 069 Disk Evolution and the Nature of Long-Lived Tidal Disruption Events

M. Guolo, A. Mummery, A. Ingram +3

We present the implementation of a fully time-dependent relativistic disk model-based on the light curve fitting package FitTeD-into the X-ray spectral fitting environment, pyXspec…

Galaxy scale consequences of tidal disruption events: extended emission line regions, extreme coronal lines and infrared-to-optical light echoes

Andrew Mummery, Muryel Guolo, James Matthews +3

Stars in galactic centers are occasionally scattered so close to the central supermassive black hole that they are completely disrupted by tidal forces, initiating a transient accr…

astro-ph.HE2025★ 16 cited

JWST's First View of Tidal Disruption Events: Compact, Accretion-Driven Emission Lines & Strong Silicate Emission in an Infrared-selected Sample

Megan Masterson, Kishalay De, Christos Panagiotou +7

Mid-infrared (MIR) emission from tidal disruption events (TDEs) is a powerful probe of the circumnuclear environment around dormant supermassive black holes. This emission arises f…

astro-ph.HE2025★ 1 cited

Discovery of a likely Type II SN at $z$ =3.6 with JWST

D. A. Coulter, J. D. R. Pierel, C. DeCoursey +30

Transient astronomy in the early, high-redshift (z > 3) Universe is an unexplored regime that offers the possibility of probing the first stars and the Epoch of Reionization. Durin…

Time-resolved Hubble Space Telescope UV observations of an X-ray quasi-periodic eruption source

Thomas Wevers, Muryel Guolo, Sean Lockwood +3

X-ray quasi-periodic eruptions (QPEs) are a novel mode of variability in nearby galactic nuclei whose origin remains unknown. Their multi-wavelength properties are poorly constrain…

The properties of GSN 069 accretion disk from a joint X-ray and UV spectral analysis: stress-testing quasi-periodic eruption models

M. Guolo, A. Mummery, T. Wevers +4

We present an analysis of Hubble Space Telescope (HST) and XMM-Newton data of the tidal disruption event (TDE) candidate and quasi-periodic eruption (QPE) source GSN 069. Using ult…

astro-ph.HE2024★ 1 cited

Quasi-periodic X-ray eruptions years after a nearby tidal disruption event

M. Nicholl, D. R. Pasham, A. Mummery +61

Quasi-periodic Eruptions (QPEs) are luminous bursts of soft X-rays from the nuclei of galaxies, repeating on timescales of hours to weeks. The mechanism behind these rare systems i…

astro-ph.HE2024★ 1 cited

The size of accretion disks from self-consistent X-ray spectra and UV/optical/NIR photometry fitting: applications to ASASSN-14li and HLX-1

Muryel Guolo, Andrew Mummery

We implement a standard thin disk model with the outer disk radius ( $R_{out}$ ) as a free parameter, integrating it into standard X-ray fitting package to enable self-consistent…

A Potential Second Shutoff from AT2018fyk: An updated Orbital Ephemeris of the Surviving Star under the Repeating Partial Tidal Disruption Event Paradigm

Dheeraj Pasham, Eric Coughlin, Muryel Guolo +4

The tidal disruption event (TDE) AT2018dyk/ASASSN-18UL showed a rapid dimming event 500 days after discovery, followed by a re-brightening roughly 700 days later. It has been hypot…

Quasi-periodic X-ray eruptions and tidal disruption events prefer similar host galaxies

T. Wevers, K. D. French, A. I. Zabludoff +10

In the past five years, six quasi-periodic X-ray eruption (QPE) sources have been discovered in the nuclei of nearby galaxies. Their origin remains an open question. We present MUS…

astro-ph.HE2024★ 30 cited

Discovery of a Relativistic Stripped Envelope Type Ic-BL Supernova at z = 2.83 with JWST

M. R. Siebert, C. Decoursey, D. A. Coulter +26

We present JWST NIRCam and NIRSpec observations of a Type Ic supernova (SN Ic) and its host galaxy (JADES-GS+53.13533-27.81457) at $z = 2.83$ . This SN (named SN 2023adta) was ident…

astro-ph.HE2024★ 1 cited

Sub-relativistic Outflow and Hours-Timescale Large-amplitude X-ray Dips during Super-Eddington Accretion onto a Low-mass Massive Black Hole in the Tidal Disruption Event AT2022lri

Yuhan Yao, Muryel Guolo, Francesco Tombesi +32

We present the tidal disruption event (TDE) AT2022lri, hosted in a nearby ( $\approx 144$ Mpc) quiescent galaxy with a low-mass massive black hole ($10^4\,M_\odot < M_{\rm BH} < 10…

A Case for a Binary Black Hole System Revealed via Quasi-Periodic Outflows

Dheeraj R. Pasham, Francesco Tombesi, Petra Sukova +33

Binaries containing a compact object orbiting a supermassive black hole are thought to be precursors of gravitational wave events, but their identification has been extremely chall…

astro-ph.HE2024★ 32 cited

Lense-Thirring Precession after a Supermassive Black Hole Disrupts a Star

Dheeraj R. Pasham, Michal Zajacek, C. J. Nixon +8

An accretion disk formed around a supermassive black hole (SMBH) after it disrupts a star is expected to be initially misaligned with respect to the black hole's equatorial plane.…