Search Publications
Seven white dwarfs with circumstellar gas discs II: tracing the composition of exoplanetary building blocks
Melis, C.; Hodgkin, S.; Rogers, L. K. +8 more
This second paper presents an in-depth analysis of the composition of the planetary material that has been accreted on to seven white dwarfs with circumstellar dust and gas emission discs with abundances reported in Rogers et al. The white dwarfs are accreting planetary bodies with a wide range of oxygen, carbon, and sulphur volatile contents, inc…
Observation of a propagating slow magnetoacoustic wave in a coronal plasma fan with SDO/AIA and SolO/EUI
Nakariakov, Valery M.; Kolotkov, Dmitrii Y.; Zhong, Sihui +1 more
Simultaneous observations of a propagating disturbance of EUV intensity, with SDO/AIA at 171 Å and SolO/EUI-HRIEUV at 174 Å, are investigated. The disturbance moves outwards along a plasma fan structure in active region AR 12941 on February 7th 2022, at 12:45-14:15 UT. The spacecraft line-of-sight separation is 19°. The variation of the EUV intens…
Using Ly α transits to constrain models of atmospheric escape
Schreyer, Ethan; Owen, James E.; Loyd, R. O. Parke +1 more
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The X-ray rise and fall of the symbiotic recurrent nova system T CrB
Sacchi, Andrea; Toalá, Jesús A.; González-Martín, Omaira +1 more
We present the analysis of publicly available NuSTAR, Suzaku, and XMM-Newton observations of the symbiotic recurrent nova T CrB covering the 2006.77-2022.66 yr period. The X-ray spectra are analysed by adopting a model that includes a reflection component produced by the presence of a disc that mimics the accretion disc and the immediate surroundi…
The discovery of a z = 0.7092 OH megamaser with the MIGHTEE survey
Adams, Elizabeth A. K.; Baes, Maarten; Heywood, Ian +18 more
We present the discovery of the most distant OH megamaser (OHM) to be observed in the main lines, using data from the MeerKAT International Giga-Hertz Tiered Extragalactic Exploration (MIGHTEE) survey. At a newly measured redshift of z = 0.7092, the system has strong emission in both the 1665 MHz (L ≈ 2500 L⊙) and 1667 MHz (L ≈ 4.5 × 10…
Supervirial hot phase in Milky Way circumgalactic medium: further evidences
Mathur, Smita; Gupta, Anjali; Das, Sanskriti +2 more
Recent discoveries of a supervirial hot phase of the Milky Way circumgalactic medium (CGM) have launched new questions regarding the multiphase structure of the CGM around the Galaxy. We use 1.05 Ms of archival Chandra/high-energy transmission grating observations to characterize highly ionized metal absorption at z = 0 along the line of sight of …
A survey for radio emission from white dwarfs in the VLA Sky Survey
Dhillon, V. S.; Strader, Jay; Dage, Kristen C. +22 more
Radio emission has been detected from tens of white dwarfs, in particular in accreting systems. Additionally, radio emission has been predicted as a possible outcome of a planetary system around a white dwarf. We searched for 3 GHz radio continuum emission in 846 000 candidate white dwarfs previously identified in Gaia using the Very Large Array S…
The positional probability and true host star identification of TESS exoplanet candidates
Armstrong, David J.; Hadjigeorghiou, Andreas
We present a method for deriving a probabilistic estimate of the true source of a detected TESS transiting event. Our method relies on comparing the observed photometric centroid offset for the target star with models of the offset that would occur if the event was either on the target or any of the Gaia identified nearby sources. The comparison i…
The first measurements of carbon isotopic ratios in post-RGB stars: SZ Mon and DF Cyg
Ventura, Paolo; Masseron, Thomas; Van Winckel, Hans +4 more
Dusty post-red giant branch (post-RGB) stars are low- and intermediate-mass stars where the RGB evolution was prematurely terminated by a poorly understood binary interaction. These binary stars are considered to be low-luminosity analogues of post-asymptotic giant branch (post-AGB) binary stars. In this study, we investigated the chemical composi…
Galaxies decomposition with spiral arms - II. A multiwavelength case study of M 51
Gontcharov, George A.; Mosenkov, Aleksandr V.; Savchenko, Sergey S. +7 more
Spiral structure can contribute significantly to a galaxy's luminosity. However, only rarely are proper photometric models of spiral arms used in decompositions. As we show in the previous work, including the spirals as a separate component in a photometric model of a galaxy would both allow to obtain their structural parameters, and reduce the sy…