Search Publications
CHEX-MATE: Characterization of the intra-cluster medium temperature distribution
Kim, J.; Pointecouteau, E.; Pratt, G. W. +23 more
Context. Galaxy clusters grow through the accretion of mass over cosmic time. Their observed properties are then shaped by how baryons distribute and energy is diffused. Thus, a better understanding of spatially resolved, projected thermodynamic properties of the intra-cluster medium (ICM) may provide a more consistent picture of how mass and ener…
Identification and characterization of six spectroscopically confirmed massive protostructures at 2.5 < z < 4.5
Shen, Lu; Koekemoer, Anton M.; Tresse, Laurence +22 more
We present six spectroscopically confirmed massive protostructures, spanning a redshift range of 2.5 < z < 4.5 in the Extended Chandra Deep Field South (ECDFS) field discovered as part of the Charting Cluster Construction in VUDS and ORELSE (C3VO) survey. We identify and characterize these remarkable systems by applying an overdensity measur…
An Earth-sized Planet on the Verge of Tidal Disruption
Latham, David W.; Knutson, Heather A.; Huber, Daniel +94 more
TOI-6255 b (GJ 4256) is an Earth-sized planet (1.079 ± 0.065 R ⊕) with an orbital period of only 5.7 hr. With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine the planet's mass to be 1.44 ± 0.14 M ⊕. The planet is just outside the Roche limit, with P orb/P Roche = 1.13 ±…
Action and energy clustering of stellar streams in deforming Milky Way dark matter haloes
Sanders, Jason L.; Petersen, Michael S.; Brooks, Richard A. N. +2 more
We investigate the non-adiabatic effect of time-dependent deformations in the Milky Way (MW) halo potential on stellar streams. Specifically, we consider the MW's response to the infall of the Large Magellanic Cloud (LMC) and how this impacts our ability to recover the spherically averaged MW mass profile from observation using stream actions. Pre…
The Gaia white dwarf revolution
Munday, James; Sahu, Snehalata; Tremblay, Pier-Emmanuel +4 more
This review highlights the role of the Gaia space mission in transforming white dwarf research. These stellar remnants constitute 5%–7% of the local stellar population in volume, yet before Gaia the lack of trigonometric parallaxes hindered their identification. The mission's Data Release 2 in 2018 provided the first unbiased colour-absolute magni…
A targeted radio pulsar survey of redback candidates with MeerKAT
Ransom, S. M.; Calore, F.; Possenti, A. +18 more
Redbacks are millisecond pulsar binaries with low-mass, irradiated companions. These systems have a rich phenomenology that can be used to probe binary evolution models, pulsar wind physics, and the neutron star mass distribution. A number of high-confidence redback candidates have been identified through searches for variable optical and X-ray so…
Geometry-driven and dark-matter-sustained Milky Way rotation curves with Gaia DR3
Lattanzi, Mario G.; Crosta, Mariateresa; Beordo, William +2 more
Thanks to Gaia DR2, we proved for the first time that a general relativistic Milky Way rotation curve is statistically indistinguishable from its state-of-the-art dark matter analogue. Those results supported the ansatz that gravitational dragging can explain the observed flatness of the Milky Way rotation curve with a consistent radial matter den…
Fragments of harmony amid apparent chaos: A closer look at the X-ray quasi-periodic eruptions of the galaxy RX J1301.9+2747
Alexander, Kate D.; Miniutti, Giovanni; Kara, Erin +17 more
Quasi-periodic eruptions (QPEs) are an extreme X-ray variability phenomenon associated with low-mass (MBH < 107 M⊙) supermassive black holes (SMBHs). First discovered in the nucleus of the galaxy GSN 069, they have been so far securely detected in five other galaxies, including RX J1301.9+2747. When detected, th…
The early evolution of young massive clusters. II. The kinematic history of NGC 6618/M 17
Kaper, L.; de Koter, A.; Rogers, C. +5 more
Context. Characterising the outcome of the star formation process is key to understand and predict the evolution of stellar populations. Especially the fraction of massive stars in young stellar clusters is of importance as they are the dominant sources of both mechanical and radiative feedback, strongly influencing the thermal and dynamical state…
Differential Rotation of the Solar Chromosphere: A Century-long Perspective from Kodaikanal Solar Observatory Ca II K Data
Chatzistergos, Theodosios; Ermolli, Ilaria; Chatterjee, Subhamoy +5 more
Chromospheric differential rotation is a key component in comprehending the atmospheric coupling between the chromosphere and the photosphere at different phases of the solar cycle. In this study, we therefore utilize the newly calibrated multidecadal Ca II K spectroheliograms (1907-2007) from the Kodaikanal Solar Observatory (KoSO) to investigate…