Search Publications
SMA observations of Haro 2: molecular gas around a hot superbubble
Beck, Sara C.; Hsieh, Pei-Ying; Turner, Jean
Haro 2, a nearby dwarf starburst dwarf galaxy with strong Ly α emission, hosts a starburst that has created outflows and filaments. The clear evidence for galactic outflow makes it an ideal candidate for studying the role of molecular gas in feedback processes in a dwarf galaxy. We observed CO(2-1) in Haro 2 at the Submillimeter Array in the compa…
NLTE spectral analysis of the intermediate helium-rich subdwarf B star CPD-20°1123
Löbling, L.
Subdwarf B (sdB) stars are core helium-burning stars with stratified atmospheres. Their atmospheres are dominated by hydrogen (H) while the helium (He) and metal abundances are shaped by an interplay of gravitational settling and radiative levitation. However, a small fraction of these show spectra dominated by He I absorption lines. In between th…
Cross-correlating Planck with VST ATLAS LRGs: a new test for the ISW effect in the Southern hemisphere
Metcalfe, Nigel; Shanks, Tom; Ansarinejad, Behzad +1 more
The integrated Sachs-Wolfe (ISW) effect probes the late-time expansion history of the Universe, offering direct constraints on dark energy. Here, we present our measurements of the ISW signal at redshifts of $\bar{z}=0.35$ , 0.55, and 0.68, using the cross-correlation of the Planck cosmic microwave background temperature map with ∼0.5 million lumi…
Pulsation and rotation in NGC 6811: the Kepler short-cadence stars
Rodríguez, E.; Martín-Ruiz, S.; Rodríguez-López, C. +3 more
We have analysed a selected sample of 36 Kepler short-cadence stars in the field of NGC 6811. The results reveal that all the targets are variable: two red giant stars with solar-like oscillations, 21 main-sequence pulsators (16 δ Scuti and five γ Doradus stars), and 13 rotating variables. Three new γ Doradus (γ Dor) variables (one is a hot γ Dor …
Doppler shifts and spectral line profile changes in the starlight scattered from an exoplanet
Anglada-Escudé, Guillem; Strachan, John B. P.
Scattered starlight from an exoplanet, commonly called reflected light, can be used to characterize the planet including the determination of its albedo and inclination of orbit. The relatively low flux ratio between directly observed starlight and starlight scattered off hot Jupiters make these systems the prime candidates for detection of reflec…
Properties of CVSO 30 from TESS measurements: probably a binary T Tauri star with complex light curves and no obvious planets
Koen, Chris
'Transiting Exoplanet Survey Satellite' (TESS) photometry of CVSO 30 spanned 21.8 d, with a single large gap of 1.1 d. This allows alias-free determination of the two periodicities in the data. It is confirmed that both of these are non-sinusoidal: the dominant P1 = 0.4990 d has two detectable harmonics and P2 = 0.4486 d has …
Elucidating the global distribution of reprocessing gas in NGC 1194
Turner, T. J.; Kraemer, S. B.; Reeves, J. N. +3 more
A joint XMM-Newton and NuSTAR observation was conducted for the bright, local Seyfert 1.9 galaxy, NGC 1194. The hard spectral form of this active galactic nucleus (AGN) was modelled using the toroidal reprocessor MYTORUS. The decoupled model form provides a good description of the spectrum, with reflection arising from gas with a global average co…
An infrared study of the high-mass, multistage star-forming region IRAS 12272-6240
Elia, Davide; Tapia, Mauricio; Persi, Paolo +1 more
IRAS 12272-6240 is a complex star-forming region with a compact massive dense clump (DC) and several associated masers, located at a well-determined distance of d = 9.3 kpc from the Sun. For this study, we obtained sub-arcsec broad- and narrow-band near-infrared (near-IR) imaging and low-resolution spectroscopy with the Baade/Magellan telescope an…
Mixed-morphology supernova remnants: the case of SNR 0520-69.4 in the Large Magellanic Cloud
Rosado, M.; Reyes-Iturbide, J.; Ramírez-Ballinas, I. +2 more
We present observations in X-ray and optical emission of the supernova remnant (SNR) 0520-69.4 in the Large Magellanic Cloud. Using XMM-Newton observatory data, we produced images of the diffuse X-ray emission and spectra to obtain the X-ray parameters, such as luminosity and temperature, of hot plasma in the SNR. Diffuse X-ray emission with fille…
Detection of gamma-ray transients with wild binary segmentation
Antier, S.; Barynova, K.; Fryzlewicz, P. +2 more
In the context of time domain astronomy, we present an offline detection search of gamma-ray transients using a wild binary segmentation analysis called F-WBSB targeting both short and long gamma-ray bursts (GRBs) and covering the soft and hard gamma-ray bands. We use NASA Fermi/GBM archival data as a training and testing data set. This paper desc…