Search Publications
Forming One of the Most Massive Objects in the Universe: The Quadruple Merger in Abell 1758
O'Sullivan, E.; David, L.; Schellenberger, G. +2 more
The system A1758 is made up of two galaxy clusters, a more massive, northern cluster and a southern cluster. Both parts are undergoing major merger events at different stages. Although the mass of the merger constituents provides enough energy to produce visible shock fronts in the X-ray, none have been found to date. We present detailed temperatu…
Developing the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Oph
Mukai, K.; Lopes de Oliveira, R.
The X-rays in intermediate polars (IPs) originate in a compact region near the surface of a magnetic white dwarf (WD) and interact with the complex environment surrounding the emission region. Here we report a case study of two IPs, TV Col and V2731 Oph, with selected archival X-ray observations (NuSTAR, Swift, Suzaku, and XMM-Newton). For TV Col,…
Long-term soft and hard X-ray investigation of the colliding wind WN+O binary WR 25
Pandey, J. C.; De Becker, M.; Arora, Bharti
We investigated the long-term behaviour in X-rays of the colliding wind binary WR 25, using archival data obtained with Suzaku, Swift, XMM-Newton, and NuSTAR spanning over ∼16 yr. Our analysis reveals phase-locked variations repeating consistently over many consecutive orbits, in agreement with an X-ray emission fully explained by thermal emission…
An insight into the extragalactic transient and variable microJy radio sky across multiple decades
Thomson, A. P.; Garrett, Michael A.; Radcliffe, Jack F. +3 more
The mJy variable extragalactic radio sky is known to be broadly non-changing with approximately 3{{ per cent}} of persistent radio sources exhibiting variability that is largely active galactic nucleus-related (AGN). In the faint (<mJy) flux density regime, it is widely accepted that the radio source population begins to change from AGN dominat…
Bolometric corrections of stellar oscillation amplitudes as observed by the Kepler, CoRoT, and TESS missions
Lund, Mikkel N.
A better understanding of the amplitudes of stellar oscillation modes and surface granulation is essential for improving theories of mode physics and the properties of the outer convection zone of solar-like stars. A proper prediction of these amplitudes is also essential for appraising the detectability of solar-like oscillations for asteroseismi…
Secondary eclipse of the hot Jupiter WASP-121b at 2 µm
Kovács, Géza; Kovács, Tamás
Ground-based observations of the secondary eclipse in the 2MASS K band are presented for the hot Jupiter WASP-121b. These are the first occultation observations of an extrasolar planet that were carried out with an instrument attached to a 1 m class telescope (the SMARTS 1.3 m). We find a highly significant eclipse depth of (0.228 ± 0.023)%. Toget…
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds
Wang, W. -H.; Levshakov, S. A.; Agafonova, I. I. +4 more
Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the weak equivalence principle. Thus, values of fundamental constants such as the proton-to-electron mass ratio, &m…
The outbursting protostar 2MASS 22352345 + 7517076 and its environment
Prusti, T.; Ábrahám, P.; Kun, M. +2 more
We studied the Class I protostar 2MASS 22352345 + 7517076 whose dramatic brightening between the IRAS, Akari, and WISE surveys was reported by Onozato et al. 2MASS 22352345+7517076 is a member of a small group of low-mass young stellar objects, associated with IRAS 22343 + 7501 in the molecular cloud Lynds 1251. The IRAS, ISO, Spitzer, Akari, Hers…
The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?
Zharikov, S. V.; Karpova, A. V.; Zyuzin, D. A. +4 more
We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The position of the detected starlike source coincides with the pulsar coordinates within the 1σ uncertainty of ≈0.2 arcsec. Its magnitudes are r' = 26.51 ± 0.17 and i' = 25.49 ± 0.15. Comparing th…
MASCARA-3b. A hot Jupiter transiting a bright F7 star in an aligned orbit
Snellen, I. A. G.; Grundahl, F.; Hjorth, M. +12 more
We report the discovery of MASCARA-3b, a hot Jupiter orbiting its bright (V = 8.33) late F-type host every 5.55149 ± 0.00001 days in an almost circular orbit (e = 0.050-0.017+0.020). This is the fourth exoplanet discovered with the Multi-site All-Sky CAmeRA (MASCARA), and the first of these that orbits a late-type star. Follo…