Search Publications
The Variable Detection of Atmospheric Escape around the Young, Hot Neptune AU Mic b
Youngblood, Allison; Lowrance, Patrick J.; Mann, Andrew W. +5 more
Photoevaporation is a potential explanation for several features within exoplanet demographics. Atmospheric escape observed in young Neptune-sized exoplanets can provide insight into and characterize which mechanisms drive this evolution and at what times they dominate. AU Mic b is one such exoplanet, slightly larger than Neptune (4.19 R ⊕
Radio variable and transient sources on minute time-scales in the ASKAP pilot surveys
Bannister, Keith W.; Kaplan, David L.; Lenc, Emil +12 more
We present results from a radio survey for variable and transient sources on 15-min time-scales, using the Australian SKA Pathfinder (ASKAP) pilot surveys. The pilot surveys consist of 505 h of observations conducted at around 1 GHz observing frequency, with a total sky coverage of 1476 deg2. Each observation was tracked for approximate…
Time evolution of Ce as traced by APOGEE using giant stars observed with the Kepler, TESS and K2 missions
Chiappini, C.; Tailo, M.; Miglio, A. +11 more
Context. Abundances of slow neutron-capture process (s-process) elements in stars with exquisite asteroseismic, spectroscopic, and astrometric constraints offer a novel opportunity to study stellar evolution, nucleosynthesis, and Galactic chemical evolution.
Aims: We investigate one of the least studied s-process elements in the literature, c…
DUVET survey: mapping outflows in the metal-poor starburst Mrk 1486
Cameron, Alex J.; Kacprzak, Glenn G.; Chisholm, John +11 more
We present a method to characterize star-formation driven outflows from edge-on galaxies and apply this method to the metal-poor starburst galaxy, Mrk 1486. Our method uses the distribution of emission line flux (from H β and [O III] 5007) to identify the location of the outflow and measure the extent above the disc, the opening angle, and the tra…
Observations of a Failed Solar Filament Eruption Involving External Reconnection
Chen, Jun; Ding, Mingde; Cheng, Xin +2 more
We report a failed solar filament eruption that involves external magnetic reconnection in a quadrupolar magnetic configuration. The evolution exhibits three phases of kinematic evolution: a slow rise, an acceleration, and a deceleration. In the early slow rise, extreme-ultraviolet brightenings appear at the expected null point above the filament …
Hidden cooling flows in clusters of galaxies - III. Accretion on to the central black hole
Fabian, A. C.; Pinto, C.; Ferland, G. J. +3 more
Recently, we have uncovered hidden cooling flows (HCFs) in the X-ray spectra of the central brightest galaxies of 11 clusters, 1 group, and 2 elliptical galaxies. Here, we report such flows in a further 15 objects, consisting of 8 clusters, 3 groups, 3 ellipticals, and 1 Red Nugget. The mass cooling rates are about $1\hbox{$\hbox{$\rm \, {\rm M}_{…
The RS Oph Outburst of 2021 Monitored in X-Rays with NICER
Steiner, James F.; Enoto, Teruaki; Nichols, Joy S. +19 more
The 2021 outburst of the symbiotic recurrent nova RS Oph was monitored with the Neutron Star Interior Composition Explorer Mission (NICER) in the 0.2-12 keV range from day one after the optical maximum, until day 88, producing an unprecedented, detailed view of the outburst development. The X-ray flux preceding the supersoft X-ray phase peaked alm…
The relationship between the incidence of X-ray selected AGN in nearby galaxies & star-formation rate
Birchall, Keir L.; Watson, M. G.; Aird, J. +1 more
We present the identification and analysis of an X-ray selected AGN sample that lie within the local (z < 0.35) galaxy population. From a parent sample of 22 079 MPA-JHU (based on SDSS DR8) galaxies, we identified 917 galaxies with central, excess X-ray emission (from 3XMM-DR7) likely originating from an AGN. We measured the host galaxies' star…
Prospects of Detecting Nonthermal Protons in Solar Flares via Lyman Line Spectroscopy: Revisiting the Orrall-Zirker Effect
Kowalski, Adam F.; Milligan, Ryan O.; Kerr, Graham S. +5 more
Solar flares are efficient particle accelerators, with a substantial fraction of the energy released manifesting as nonthermal particles. While the role that nonthermal electrons play in transporting flare energy is well studied, the properties and importance of nonthermal protons are rather less well understood. This is in large part due to the p…
Rotational modulation in A and F stars: magnetic stellar spots or convective core rotation?
García, Rafael A.; Antoci, Victoria; Murphy, Simon J. +7 more
The Kepler mission revealed a plethora of stellar variability in the light curves of many stars, some associated with magnetic activity or stellar oscillations. In this work, we analyse the periodic signal in 162 intermediate-mass stars, interpreted as Rossby modes and rotational modulation - the so-called hump and spike feature. We investigate wh…