Search Publications
Comparison of methods used to derive the Galactic star formation history from white dwarf samples
Tremblay, Pier-Emmanuel; O'Brien, Mairi W.; Bédard, Antoine +4 more
We compare three methods of deriving the local Galactic star formation history, using as a benchmark the Gaia-defined 40 pc white dwarf sample, currently the largest volume complete sample of stellar remnants with medium-resolution spectroscopy. We create a population synthesis model to (1) reproduce the observed white dwarf luminosity function, (…
Complex investigations of an active star formation region in the southern part of Mon R2
Moiseev, A. V.; Bally, J.; Movsessian, T. A. +1 more
We continue to present the results of a Byurakan Narrow Band Imaging Survey (BNBIS). In this work, we present the results of the search and further detailed investigation of the objects, found in the course of the BNBIS survey in the southern part of the Mon R2 (Monoceros R2) association. For the search of Herbig-Haro (HH) objects, the narrow-band…
Detection of ubiquitous circumbinary matter in hot subdwarfs formed from common-envelope ejections
Han, Zhanwen; Chen, Xuefei; Wolf, Christian +7 more
The formation of compact binary systems is largely driven by their evolution through a common envelope (CE) phase, crucial for understanding phenomena such as type Ia supernovae and black hole mergers. Despite their importance, direct observational evidence for CE material has been elusive due to the transient nature of these envelopes. Numerical …
Characterizing planetary material accreted by cool helium-atmosphere white dwarfs using an exponentially decaying disc model
Melis, Carl; Klein, Beth L.; Veras, Dimitri +5 more
We present Keck High Resolution Echelle Spectrometer observations and model atmosphere analysis for two nearby, cool, helium-dominated atmosphere white dwarfs that have been polluted by accretion: WD J1927-0355 and WD J2141-3300. Detected elements common to both white dwarfs are Mg, Ca, Ti, Cr, Fe, and Ni, with additional detections of Na, Al, Si,…
Constraints on optical and near-infrared variability in the localization of the long-period radio transient GLEAM-X J1627-52
Lyman, J. D.; Dhillon, V. S.; Steeghs, D. T. H. +5 more
GLEAM-X J1627-52 was discovered as a periodic (
Miscentring of optical galaxy clusters based on Sunyaev-Zeldovich counterparts
Strauss, Michael A.; Hilton, Matt; Sifón, Cristóbal +7 more
The 'miscentring effect', i.e. the offset between a galaxy cluster's optically defined centre and the centre of its gravitational potential, is a significant systematic effect on brightest cluster galaxy (BCG) studies and cluster lensing analyses. We perform a cross-match between the optical cluster catalogue from the Hyper Suprime-Cam (HSC) Surve…
HD 60435: the star that stopped pulsating
Antoci, Victoria; Murphy, Simon J.; Hey, Daniel R. +10 more
HD 60435 is a well known rapidly oscillating (roAp) Ap star with a series of alternating even and odd degree modes, making it a prime asteroseismic target. It is also an oblique pulsator with rotational inclination, i, and magnetic/pulsation obliquity,
Land of gas and dust - exploring bursting cavities on comet 67P
De Keyser, Johan; Berthelier, Jean-Jacques; Wurz, Peter +9 more
Gas and dust outbursts are recurring phenomena on comets, offering critical insights into their subsurface activities. On comet 67P/Churyumov-Gerasimenko, two distinct outburst types have been identified: CO
Mind the gaps: improved methods for the detection of periodicities in unevenly sampled data
Gúrpide, Andrés; Middleton, Matthew
The detection of periodic signals in irregularly sampled time series is a problem commonly encountered in astronomy. Traditional tools used for periodic searches, such as the periodogram, have poorly defined statistical properties under irregular sampling, which complicate inferring the underlying aperiodic variability used for hypothesis testing.…
Correction to: Constraints on light decaying dark matter candidates from 16 yr of INTEGRAL/SPI observations
Calore, F.; Dekker, A.; Serpico, P. D. +1 more