Search Publications
High-velocity runaway binaries from supernovae in triple systems
Li, Jiao; Jia, Shi; Gao, Yan
Recent studies on hypervelocity stars (HVSs) have generated a need to understand the high velocity limits of binary systems. If runaway binary systems with high movement speeds well in excess of 200 km s-1 were to exist, it would have implications on how HVS candidates are selected, and our current understanding of how they form needs t…
An unusually large gaseous transit in a debris disc
Wahhaj, Zahed; Kennedy, Grant M.; Godoy, Nicolás +9 more
We present the detection of an unusually large transient gas absorption in several ionized species in the debris disc star HD 37306 using high-resolution optical spectra. We have been analysing a large sample of debris discs searching for circumstellar gas absorptions aiming to determine the frequency of gas in debris discs. HD 37306 stood out sho…
The case for a high-redshift origin of GRB 100205A
Cenko, S. B.; Lyman, J. D.; Berger, E. +15 more
The number of long gamma-ray bursts (GRBs) known to have occurred in the distant Universe (z > 5) is small (∼15); however, these events provide a powerful way of probing star formation at the onset of galaxy evolution. In this paper, we present the case for GRB 100205A being a largely overlooked high-redshift event. While initially noted as a h…
Ultraviolet Mg II emission from fast neutral ejecta around Eta Carinae
Smith, Nathan; Morse, Jon A.
We present the first images of the nebula around η Carinae obtained with the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope (HST), including an ultraviolet (UV) image in the F280N filter that traces Mg II emission, plus contemporaneous imaging in the F336W, F658N, and F126N filters that trace near-UV continuum, [N II], and [Fe II], …
Analysis of layering-related linear features on comet 67P/Churyumov-Gerasimenko
Penasa, Luca; Boehnhardt, Hermann; Remetean, Emile +4 more
We analysed layering-related linear features on the surface of comet 67P/Churyumov-Gerasimenko (67P) to determine the internal configuration of the layerings within the nucleus. We used high-resolution images from the OSIRIS Narrow Angle Camera onboard the Rosetta spacecraft, projected on to the SHAP7 shape model of the nucleus, to map 171 layerin…
On the ultra-compact nature of the neutron star system 1RXS J170854.4-321857: insights from X-ray spectroscopy
Armas Padilla, M.; López-Navas, E.
The relatively small family of ultra-compact X-ray binary systems is of great interest for many areas of astrophysics. We report on a detailed X-ray spectral study of the persistent neutron star low-mass X-ray binary 1RXS J170854.4-321857. We analysed two XMM-Newton observations obtained in late 2004 and early 2005 when, in agreement with previous…
Searching for correlations in Gaia DR2 unbound star trajectories
García-Bellido, J.; Barrado, D.; Montanari, F.
Scattering events with compact objects are expected in the primordial black hole (PBH) cold dark matter (CDM) scenario, due to close encounters between stars and PBHs in the dense environments of dwarf spheroidals. We develop a Bayesian framework to search for correlations among Milky Way stellar trajectories and those of globular clusters and dwa…
Chemical evolution of HC3N in dense molecular clouds
Wang, Jun-Jie; Xu, Jin-Long; Yu, Naiping
We investigated the chemical evolution of HC3N in six dense molecular clouds, using archival available data from the Herschel infrared Galactic Plane Survey (Hi-GAL) and the Millimeter Astronomy Legacy Team Survey at 90 GHz (MALT90). Radio sky surveys of the Multi-Array Galactic Plane Imaging Survey (MAGPIS) and the Sydney University Mo…
New variable stars towards the Galactic Bulge - I. The bright regime
Rejkuba, M.; Anderson, J.; Zoccali, M. +8 more
We report the detection of 3714 variable stars towards the Galactic bulge, including 2521 previously uncatalogued variables, using time-series photometry extracted from data obtained with the VIMOS imager at the Very Large Telescope. Observations of the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS) field in the Galactic Bulge were…
NuSTAR and XMM-Newton observations of SXP 59 during its 2017 giant outburst
Weng, Shan-Shan; Ge, Ming-Yu; Zhao, Hai-Hui
The Be X-ray pulsar (BeXRP) SXP 59 underwent a giant outburst in 2017 with a peak X-ray luminosity of 1.1 × 1038 erg s-1. We report on the X-ray behaviour of SXP 59 with the XMM-Newton and NuSTAR observations collected at the outburst peak, decay, and the low luminosity states. The pulse profiles are energy dependent, the pul…