Search Publications
SCUBA-2 observations of candidate starbursting protoclusters selected by Planck and Herschel-SPIRE
Andreani, P.; Valtchanov, I.; Clements, D. L. +21 more
We present SCUBA-2 850 µm observations of 13 candidate starbursting protoclusters selected using Planck and Herschel data. The cumulative number counts of the 850 µm sources in 9 of 13 of these candidate protoclusters show significant overdensities compared to the field, with the probability <10-2 assuming the sources are…
Classifying exoplanet candidates with convolutional neural networks: application to the Next Generation Transit Survey
Wheatley, Peter J.; Eigmüller, Philipp; Casewell, Sarah L. +13 more
Vetting of exoplanet candidates in transit surveys is a manual process, which suffers from a large number of false positives and a lack of consistency. Previous work has shown that convolutional neural networks (CNN) provide an efficient solution to these problems. Here, we apply a CNN to classify planet candidates from the Next Generation Transit…
Spectral analysis of the extremely hot DA white dwarf PG 0948+534
Rauch, T.; Werner, K.; Reindl, N.
There is a striking paucity of hydrogen-rich (DA) white dwarfs (WDs) relative to their hydrogen-deficient (non-DA) counterparts at the very hot end of the WD cooling sequence. The three hottest known DAs (surface gravity log g ≥ 7.0) have effective temperatures around T_{eff} = 140 000 K, followed by only five objects in the range 104 000-120 000 …
Temperature stability in the sub-milliHertz band with LISA Pathfinder
Mendes, L.; Russano, G.; Lloro, I. +79 more
LISA Pathfinder (LPF) was a technology pioneering mission designed to test key technologies required for gravitational wave detection in space. In the low frequency regime (milliHertz and below), where space-based gravitational wave observatories will operate, temperature fluctuations play a crucial role since they can couple into the interferomet…
Wide binary companions to massive stars and their use in constraining natal kicks
Igoshev, Andrei P.; Perets, Hagai B.
The origin of ultrawide massive binaries (orbital separations 103-2 × 105 au) and their properties are neither well characterized nor understood. Here we use the second Gaia data release to search for wide astrometric companions to Galactic O-B5 stars which share similar parallax and proper motion with the primaries. Using th…
Calibration of the mixing-length theory for structures of helium-dominated atmosphere white dwarfs
Ludwig, H. -G.; Fontaine, G.; Tremblay, P. -E. +5 more
We perform a calibration of the mixing-length parameter at the bottom boundary of the convection zone for helium-dominated atmospheres of white dwarfs. This calibration is based on a grid of 3D DB (pure-helium) and DBA (helium-dominated with traces of hydrogen) model atmospheres computed with the CO5BOLD radiation-hydrodynamics code, and a grid of…
Three candidate globular clusters discovered in the Galactic bulge
Minniti, D.; Camargo, D.
This work reports the discovery of three new globular clusters (GCs) towards the Galactic bulge - Camargo 1107, 1108, and 1109. The discovery was made using the WISE, 2MASS, VVV, and Gaia-DR2 photometry. The new findings are old (12.0-13.5 Gyr) and metal-poor GCs ([Fe/H] < -1.5 dex) located in the bulge area close to the Milky Way (MW) mid-plan…
X-ray scaling relations from a complete sample of the richest maxBCG clusters
Jones, Christine; Vikhlinin, Alexey; Nagai, Daisuke +5 more
We use a complete sample of 38 richest maxBCG clusters to study the ICM-galaxy scaling relations and the halo mass selection properties of the maxBCG algorithm, based on X-ray and optical observations. The clusters are selected from the two largest bins of optical richness in the Planck stacking work with the maxBCG richness N200 ≥ 78. …
The wavelength dependence of interstellar polarization in the Local Hot Bubble
Wyatt, Mark C.; Bailey, Jeremy; Cotton, Daniel V. +6 more
The properties of dust in the interstellar medium (ISM) nearest the Sun are poorly understood because the low column densities of dust toward nearby stars induce little photometric reddening, rendering the grains largely undetectable. Stellar polarimetry offers one pathway to deducing the properties of this diffuse material. Here we present multi-…
Hypervelocity stars from star clusters hosting intermediate-mass black holes
Fragione, Giacomo; Gualandris, Alessia
Hypervelocity stars (HVSs) represent a unique population of stars in the Galaxy reflecting properties of the whole Galactic potential. Determining their origin is of fundamental importance to constrain the shape and mass of the dark halo. The leading scenario for the ejection of HVSs is an encounter with the supermassive black hole in the Galactic…