Search Publications
TOI-837 b: Characterisation, formation, and evolutionary history of an infant warm Saturn-mass planet
Baratella, M.; Marzari, F.; Sozzetti, A. +15 more
Context. The detection and characterisation of planets younger than ~100 Myr offer the opportunity to get snapshots of systems immediately after their formation, where the main evolutionary processes that sculpt mature planetary systems are still ongoing. Known infant exoplanets are currently scarce, and dedicated surveys are required to increase …
Genuine Retrieval of the AGN Host Stellar Population (GRAHSP)
Nandra, Kirpal; Li, Junyao; Netzer, Hagai +11 more
Context. The assembly and co-evolution of super-massive black holes (SMBHs) and their host galaxy stellar population is one of the key open questions in modern galaxy evolution. Observationally constraining this question is challenging. Important parameters of galaxies, such as the stellar mass (M⋆) and star formation rate (SFR), are in…
New Galaxy UV Luminosity Constraints on Warm Dark Matter from JWST
Liu, Bin; Shan, Huanyuan; Zhang, Jiajun
We exploit the recent James Webb Space Telescope (JWST) determination of galaxy UV luminosity functions over the redshift range z = 9–14.5 to derive constraints on warm dark matter (WDM) models. The delayed structure formations in WDM universes make high-redshift observations a powerful probe to set limits on the particle mass m x of WD…
WISDOM Project - XVI. The link between circumnuclear molecular gas reservoirs and active galactic nucleus fuelling
Williams, Thomas G.; Cappellari, Michele; Davis, Timothy A. +8 more
We use high-resolution data from the millimetre-Wave Interferometric Survey of Dark Object Masses (WISDOM) project to investigate the connection between circumnuclear gas reservoirs and nuclear activity in a sample of nearby galaxies. Our sample spans a wide range of nuclear activity types including radio galaxies, Seyfert galaxies, low-luminosity…
A Unified Model for Bipolar Outflows from Young Stars: Kinematic and Mixing Structures in HH 30
Johnstone, Doug; Liu, Chun-Fan; Shang, Hsien +2 more
The young stellar source HH 30 is a textbook example of an ionic optical jet originating from a disk in an edge-on system shown by the Hubble Space Telescope. It has a remnant envelope in 12CO observed by the Atacama Large Millimeter/submillimeter Array. The optical jet is characterized by its narrow appearance, large line width at the …
Application of hydrostatic local thermodynamic equilibrium atmosphere models to interpretations of supersoft X-ray source spectra
Werner, K.; Doroshenko, V.; Suleimanov, V. F. +1 more
Supersoft X-ray sources (SSSs) are accreting white dwarfs (WDs) with stable or recurrent thermonuclear burning on their surfaces. High-resolution X-ray spectra of such objects are rather complex, often consist of several components, and are difficult to interpret accurately. The main emission source is the hot surface of the WD and the emergent ra…
Kinematic Age of the β-Pictoris Moving Group
Song, Inseok; Lee, Jinhee
Accurate age estimation of nearby young moving groups (NYMGs) is important as they serve as crucial testbeds in various fields of astrophysics, including the formation and evolution of stars and planets, as well as loose stellar associations. The β-Pictoris moving group (BPMG), being one of the closest and youngest NYMGs, has been extensively inve…
Deciphering cometary outbursts: linking gas composition changes to trigger mechanisms
Mall, Urs; De Keyser, Johan; Berthelier, Jean-Jacques +9 more
Dust and gas outbursts are recurrent cometary phenomena, playing a crucial role in shaping the coma. Proposed outburst trigger mechanisms include cliff collapse, pressure pockets, and amorphous-to-crystalline phase transition of water ice; however, the underlying processes remain inadequately understood. In this study, we analyse Rosetta/ROSINA da…
GRB 231115A: A Nearby Magnetar Giant Flare or a Cosmic Short Gamma-Ray Burst?
Zhou, Hao; Jin, Zhi-Ping; Wang, Yun +3 more
There are two classes of gamma-ray transients with a duration shorter than 2 s. One consists of cosmic short gamma-ray bursts (GRBs) taking place in the deep Universe via the neutron star mergers, and the other is the magnetar giant flares (GFs) with energies of ∼1044 ‑ 1046 erg from "nearby" galaxies. Though the magnetar GFs…
The Outflow of The Protostar in B335. I.
Johnstone, Doug; Rieke, George; Rieke, Marcia J. +10 more
The isolated globule B335 contains a single, low-luminosity Class 0 protostar associated with a bipolar nebula and outflow system seen nearly perpendicular to its axis. We observed the innermost regions of this outflow as part of JWST/NIRCam Guaranteed Time Observations program 1187, primarily intended for wide-field slitless spectroscopy of backg…