Search Publications
Cluster population demographics in NGC 628 derived from stochastic population synthesis models
Grasha, Kathryn; Krumholz, Mark R.; Tang, Jianling
The physical properties of star cluster populations offer valuable insights into their birth, evolution, and disruption. However, individual stars in clusters beyond the nearest neighbours of the Milky Way are unresolved, forcing analyses of star cluster demographics to rely on integrated light, a process fraught with uncertainty. Here, we infer t…
The origin of the X-ray emission from the non-starburst gas-rich luminous infrared galaxies Arp 302
Jiang, Jiachen; Gallo, Luigi; Baker, William +1 more
We present an analysis of the XMM-Newton observation of luminous infrared merging galaxies Arp 302 and a joint re-analysis of its Chandra observation. In particular, we focus on the more significant X-ray emitter of the pair, Arp 302N. Chandra detects significant soft X-ray emission from the hot gas in the star-forming region of Arp 302N spreading…
A reanalysis of the LHS 1140 b atmosphere observed with the Hubble Space Telescope
Petralia, Antonino; Micela, Giuseppina; Maldonado, Jesús +3 more
The super-Earth LHS 1140 b is an interesting target for atmospheric observations since it is close to the habitable zone of its star and falls in the gap of the radius distribution of small exoplanets, in the region thought to correspond to the transition between planets with and without atmospheres. Observations of the primary transit with WFC3 o…
The VISCACHA survey - IX. The SMC Southern Bridge in 8D
Minniti, D.; Bica, E.; Fernández-Trincado, J. G. +16 more
The structure of the Small Magellanic Cloud (SMC) outside of its main body is characterized by tidal branches resulting from its interactions mainly with the Large Magellanic Cloud (LMC). Characterizing the stellar populations in these tidal components helps to understand the dynamical history of this galaxy and of the Magellanic system in general…
Upper limits of 44Ti decay emission in four nearby thermonuclear supernova remnants
Zhou, Ping; Wik, Daniel R.; Chen, Yang +2 more
To identify progenitors and investigate evidence of He burning, we searched for decay radiation of freshly synthesized 44Ti in four young nearby thermonuclear supernova remnants: Kepler, SN 1885, G1.9+0.3, and SN 1006, by analysing the up-to-date NuSTAR archival data. No apparent flux excess from the 68 and 78 keV line emissions accompa…
Doppler signature of a possible termination shock in an off-limb solar flare
Chen, Bin; Yu, Sijie; Matthews, Sarah A. +2 more
We report striking Doppler velocity gradients observed during the well-observed 2017 September 10 solar flare, and argue that they are consistent with the presence of an above-the-looptop termination shock beneath the flare current sheet. Observations from the Hinode Extreme-ultraviolet Imaging Spectrometer measure plasma sheet Doppler shifts up t…
A search for intermediate-mass black holes in compact stellar systems through optical emissions from tidal disruption events
Norris, Mark A.; Pomeroy, Richard T.
Intermediate-mass black holes (IMBHs) are expected to exist in globular clusters (GCs) and compact stellar systems (CSSs) in general, but none have been conclusively detected. Tidal disruption events (TDEs), where a star is tidally disrupted by the gravitational field of a black hole, have been observed to occur around the supermassive black holes…
Three young planets around the K-dwarf K2-198: high-energy environment, evaporation history, and expected future
Baratella, M.; Poppenhaeger, K.; Ilin, E. +1 more
Planets orbiting young stars are thought to experience atmospheric evaporation as a result of the host stars' high-magnetic activity. We study the evaporation history and expected future of the three known transiting exoplanets in the young multiplanet system K2-198. Based on spectroscopic and photometric measurements, we estimate an age of the K-…
Studying the variability of fluorescence emission and the presence of clumpy wind in HMXB GX 301-2 using XMM-Newton
Paul, Biswajit; Roy, Kinjal; Manikantan, Hemanth
We present the results from an analysis of data from an XMM-Newton observation of the accreting high-mass X-ray binary pulsar GX 301-2. Spectral analysis in the non-flaring segment of the observation revealed that the equivalent width of the iron fluorescence emission is correlated with the observed absorption column density and the ratio of the i…
The wave-like disc oscillations of mono-age stellar populations in the Solar neighbourhood from Gaia DR3
Chen, Bing-Qiu; Wang, Tao; Liu, Xiao-Wei +2 more
The North-South asymmetry in the number density and bulk velocity of stars in the Solar neighbourhood provides valuable insights into the formation and evolution of the Milky Way disc. Our objective is to investigate the wave-like disc oscillations of mono-age stellar populations in the Solar neighbourhood using data from Gaia Data Release 3. We h…