Search Publications
The puzzling story of flare inactive ultra fast rotating M dwarfs - I. Exploring their magnetic fields
Ramsay, Gavin; Hakala, Pasi; Doyle, Lauren +2 more
Stars which are rapidly rotating are expected to show high levels of activity according to the activity-rotation relation. However, previous TESS studies have found ultra fast rotating (UFR) M dwarfs with periods less than 1 d displaying low levels of flaring activity. As a result, in this study, we utilize VLT/FORS2 spectro-polarimetric data of 1…
Properties of shocked dust grains in supernova remnants
De Looze, I.; Gomez, H. L.; Barlow, M. J. +3 more
Shockwaves driven by supernovae both destroy dust and reprocess the surviving grains, greatly affecting the resulting dust properties of the interstellar medium (ISM). While these processes have been extensively studied theoretically, observational constraints are limited. We use physically motivated models of dust emission to fit the infrared (IR…
Quasi-periodic whispers from a transient ULX in M 101: signatures of a fast-spinning neutron star?
Soria, Roberto; Pintore, Fabio; Esposito, Paolo +7 more
We have studied the unusual time variability of an ultraluminous X-ray source in M 101, 4XMM J140314.2 + 541806 (henceforth, J1403), using Chandra and XMM-Newton data. Over the last two decades, J1403 has shown short-duration outbursts with an X-ray luminosity ~1-3 × 1039 erg s-1, and longer intervals at luminosities ~0.5-1 ×…
The Photo-Astrometric vertical tracer density of the Milky Way - I. The method
Everall, Andrew; Boubert, Douglas; Grand, Robert J. J. +2 more
We introduce a method to infer the vertical distribution of stars in the Milky Way using a Poisson likelihood function, with a view to applying our method to the Gaia catalogue. We show how to account for the sample selection function and for parallax measurement uncertainties. Our method is validated against a simulated sample drawn from a model …
Deep uGMRT observations of the ELAIS-North 1 field: statistical properties of radio-infrared relations up to z 2
Datta, Abhirup; Basu, Aritra; Sinha, Akriti +1 more
Comprehending the radio-infrared (IR) relations of the faint extragalactic radio sources is important for using radio emission as a tracer of star formation in high redshift (z) star-forming galaxies (SFGs). Using deep uGMRT observations of the ELAIS-N1 field in the 0.3-0.5 GHz range, we study the statistical properties of the radio-IR relations a…
Seimei KOOLS-IFU mapping of the gas and dust distributions in Galactic planetary nebulae: the case of IC 2165
Otsuka, Masaaki
We investigated the physical and chemical properties of the gas and dust components in a carbon-rich planetary nebula (PN) IC 2165 using two-dimensional emission-line maps with superior resolution. The extinction map is generated in a self-consistent and assumption-free manner. The circumstellar gas-to-dust mass ratio (GDR) map ranges radially fro…
Searching for the next Galactic Luminous red nova
Jones, David; Blagorodnova, Nadejda; Erasmus, Nicolas +3 more
Luminous red novae (LRNe) are astrophysical transients believed to be caused by the partial ejection of a binary star's common envelope (CE) and the merger of its components. The formation of the CE is likely to occur during unstable mass transfer, initiated by a primary star which is evolving off the main sequence (a Hertzsprung gap star) and a l…
Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era
Kovács, J.; Claret, A.; Kundra, E. +4 more
Rapidly rotating early-type main-sequence stars with transiting planets are interesting in many aspects. Unfortunately, several astrophysical effects in such systems are not well understood yet. Therefore, we performed a photometric mini-survey of three rapidly rotating stars with transiting planets, namely KELT-17b, KELT-19Ab, and KELT-21b, using…
Stars in the local galactic thick disc and halo in Gaia EDR3: a catalogue of half a million local main-sequence stars with photometric metallicities
Kim, Bokyoung; Lépine, Sebastien
We present a catalogue of 551 214 main-sequence stars in the local (d < 2 kpc) Galactic thick disc and halo, based on a search of stars with large proper motions ($\mu _{\rm tot} \gt 40.0~\rm mas\, yr^{-1}$) in the Gaia Early Data Release 3. We derive photometric metallicity calibrated from the colour-luminosity-metallicity distribution of 20 0…
The XMM Cluster Survey: an independent demonstration of the fidelity of the eFEDS galaxy cluster data products and implications for future studies
Romer, A. K.; Mann, R. G.; Klein, M. +10 more
We present the first comparison between properties of clusters of galaxies detected by the eROSITA Final Equatorial-Depth Survey (eFEDS) and the XMM Cluster Survey (XCS). We have compared, in an ensemble fashion, properties from the eFEDS X-ray cluster catalogue with those from the Ultimate XMM eXtragaLactic (XXL) survey project (XXL-100-GC). We f…