Search Publications
On the follow-up efforts of long-period transiting planet candidates detected with Gaia astrometry
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +1 more
The class of transiting cold Jupiters, orbiting at ≳0.5-1.0 au, is to-date underpopulated. Probing their atmospheric composition and physical characteristics is particularly valuable, as it allows for direct comparisons with the Solar system giant planets. We investigate some aspects of the synergy between Gaia astrometry and other ground-based an…
Extended line emission in the BCG of Abell 2390
Drissen, Laurent; Muzzin, Adam; Yee, H. K. C. +10 more
We report CFHT/SITELLE imaging Fourier Transform Spectrograph observations of the brightest cluster galaxy (BCG) of galaxy cluster Abell 2390 at z = 0.228. The BCG displays a prominent cone of emission in H α, H β, [N II], and [O II] to the North-West with PA = 42°, 4.4 arcsec in length (15.9 kpc), which is associated with elongated and asymmetric…
Virial black hole mass estimates of quasars in the XQ-100 legacy survey
Wolf, Christian; Lai, Samuel; Bian, Fuyan +4 more
The black hole (BH) mass and luminosity are key factors in determining how a quasar interacts with its environment. In this study, we utilize data from the European Southern Observatory Large Programme XQ-100, a high-quality sample of 100 X-shooter spectra of the most luminous quasars in the redshift range 3.5 < z < 4.5, and measure the prop…
Unresolved Rossby and gravity modes in 214 A and F stars showing rotational modulation
Bowman, Dominic M.; Pallé, P. L.; Antoci, Victoria +9 more
Here, we report an ensemble study of 214 A- and F-type stars observed by Kepler, exhibiting the so-called hump and spike periodic signal, explained by Rossby modes (r modes) - the hump - and magnetic stellar spots or overstable convective (OsC) modes - the spike, respectively. We determine the power confined in the non-resolved hump features and f…
The MOSDEF-LRIS survey: detection of inflowing gas towards three star-forming galaxies at z 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +9 more
We report on the discovery of cool gas inflows towards three star-forming galaxies at <z> ~ 2.30. Analysis of Keck Low-Resolution Imaging Spectrometer spectroscopy reveals redshifted low-ionization interstellar (LIS) metal absorption lines with centroid velocities of 60-130 km s-1. These inflows represent some of the most robust d…
The false widow link between neutron star X-ray binaries and spider pulsars
Ingram, Adam; Middleton, Matthew; Rhodes, Lauren +3 more
The discovery of transitional millisecond pulsars (tMSPs) provided conclusive proof that neutron star (NS) low-mass X-ray binaries (LMXBs) comprise part of the evolutionary pathway towards binary millisecond pulsars (MSPs). Redback and black widow 'spider' pulsars are a subcategory of binary MSPs that 'devour' their companions through ablation - t…
Globular cluster ultraluminous X-ray sources in the furthest early-type galaxies
Kundu, Arunav; Dage, Kristen C.; Zepf, Stephen E. +5 more
Ultraluminous X-ray sources (ULXs) in globular clusters (GCs) are low-mass X-ray binaries that achieve high X-ray luminosities through a currently uncertain accretion mechanism. Using archival Chandra and Hubble Space Telescope observations, we perform a volume-limited search (≲70 Mpc) of 21 of the most massive ($\gt 10^{11.5} \, \mathrm{M}_\odot$…
Origins of the UV/X-ray relation in Arakelian 120
Done, C.; Porquet, D.; Lobban, A. +1 more
We explore the accretion geometry in Arakelian 120 using intensive UV and X-ray monitoring from Swift. The hard X-rays (1-10 keV) show large amplitude, fast (few-day) variability, so we expect reverberation from the disc to produce UV variability from the varying hard X-ray illumination. We model the spectral energy distribution (SED) including an…
Exploring source region of 3-min slow magnetoacoustic waves observed in coronal fan loops rooted in sunspot umbra
Gupta, Girjesh R.; Rawat, Ananya
Sunspots host various oscillations and wave phenomena like umbral flashes, umbral oscillations, running penumbral waves, and coronal waves. All fan loops rooted in sunspot umbra constantly show a 3-min period propagating slow magnetoacoustic waves in the corona. However, their origin in the lower atmosphere is still unclear. In this work, we studi…
Observational signatures of carbon-oxygen white dwarf merger remnants
Goulding, Andy; Quataert, Eliot; Yao, Philippe Z.
Many double white dwarf (WD) mergers likely do not lead to a prompt thermonuclear explosion. We investigate the prospects for observationally detecting the surviving remnants of such mergers, focusing on the case of mergers of double Carbon-Oxygen WDs. For ~104 yr, the merger remnant is observationally similar to an extreme AGB star evo…