Search Publications
Analysis of apsidal motion in eclipsing binaries using TESS data. I. A test of gravitational theories
Ribas, I.; Anglada-Escudé, G.; Morales, J. C. +3 more
Context. The change in the argument of periastron of eclipsing binaries, that is, the apsidal motion caused by classical and relativistic effects, can be measured from variations in the difference between the time of minimum light of the primary and secondary eclipses. Poor apsidal motion rate determinations and large uncertainties in the classica…
A KMOS survey of the nuclear disk of the Milky Way. I. Survey design and metallicities
Schultheis, M.; Prieto, M. A.; Fritz, T. K. +7 more
Context. In the central few degrees of the bulge of the Milky Way there is a flattened structure of gas, dust, and stars, known as the central molecular zone, that is similar to nuclear disks in other galaxies. As a result of extreme foreground extinction, we possess only sparse information about the (mostly old) stellar population of the nuclear …
AGN Triality of Triple Mergers: Detection of Faint X-Ray Point Sources
Gültekin, Kayhan; Runnoe, Jessie C.; Foord, Adi +1 more
We present results from our X-ray analysis of a systematic search for triple active galactic nuclei (AGNs) in nearby (z < 0.077) triple galaxy mergers. We analyze archival Chandra observations of seven triple galaxy mergers with BAYMAX (Bayesian Analysis of Multiple AGNs in X-rays), fitting each observation with single, dual, and triple X-ray p…
The dipper population of Taurus seen with K2
Cody, Ann Marie; Rebull, Luisa M.; Roggero, Noemi +1 more
Context. Dippers are typically low-mass, pre-main-sequence stars that display dips in their light curves. These dips have been attributed to dusty warps that form in the inner part of the disk.
Aims: Our goal is to derive the characteristics of dipper stars in Taurus to assess the physical mechanisms that induce dipper light curves.
Meth…
Double Image Polarimeter—Ultra Fast: Simultaneous Three-color (BV R) Polarimeter with Electron-multiplying Charge-coupled Devices
Piirola, Vilppu; Poutanen, Juri; Berdyugin, Andrei V. +2 more
We describe a new instrument capable of high-precision (10-5) polarimetric observations simultaneously in three passbands (BVR). The instrument utilizes electron-multiplying charge-coupled device (EM CCD) cameras for high efficiency and fast image readout. The key features of the Double Image Polarimeter—Ultra Fast (DIPol-UF) are: (i) t…
A transit timing variation observed for the long-period extremely low-density exoplanet HIP 41378 f
Triaud, Amaury H. M. J.; Wheatley, Peter J.; Bayliss, Daniel +47 more
HIP 41378 f is a temperate 9.2 ± 0.1 R⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm-3. It transits the bright star HIP 41378 (V = 8.93), making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dat…
Weighing the Galactic disk using phase-space spirals. I. Tests on one-dimensional simulations
de Salas, P. F.; Widmark, A.; Laporte, C.
We present a new method for inferring the gravitational potential of the Galactic disk, using the time-varying structure of a phase-space spiral in the (z, w)-plane (where z and w represent vertical position and vertical velocity). Our method of inference extracts information from the shape of the spiral and disregards the bulk density distributio…
Gaia Early Data Release 3
Kotak, Rubina; Forveille, Thierry
What Makes Quadruply Lensed Quasars Quadruple?
Schechter, Paul L.; Luhtaru, Richard; de Soto, Kaylee M.
Among known strongly lensed quasar systems, ~25% have gravitational potentials sufficiently flat (and sources sufficiently well aligned) to produce four images rather than two. The projected flattening of the lensing galaxy and tides from neighboring galaxies both contribute to the potential's quadrupole. Witt's hyperbola and Wynne's ellipse permi…
Search for globular clusters associated with the Milky Way dwarf galaxies using Gaia DR2
Koposov, Sergey E.; Huang, Kuan-Wei
We report the result of searching for globular clusters (GCs) around 55 Milky Way (MW) satellite dwarf galaxies within the distance of 450 kpc from the Galactic Centre except for the Large and Small Magellanic Clouds and the Sagittarius dwarf. For each dwarf, we analyse the stellar distribution of sources in Gaia DR2, selected by magnitude, proper…