Search Publications
Tidally stripped halo stars from the Large Magellanic Cloud in the Galactic North
Peñarrubia, Jorge; Petersen, Michael S.; Jones, Ella
We examine whether the Large Magellanic Cloud (LMC) is currently losing its stellar halo to Milky Way (MW) tides. We present a live N-body model for the ongoing MW-LMC interaction that predicts a prominent stream of stars tidally stripped from the progenitor LMC. We use this model to define a strategy to search for stripped material in kinematic s…
Modelling the stellar halo with RR-Lyrae stars
Li, Chengdong; Binney, James
A seven-parameter distribution function (DF) is fitted to $20\, 000$ RR-Lyrae stars for which only astrometric data are available. The observational data are predicted by the DF in conjunction with the gravitational potential of a self-consistent model Galaxy defined by DFs for the dark halo, the bulge, and a four-component disc. Tests of the tech…
Atmospheric mass-loss and stellar wind effects in young and old systems - I. Comparative 3D study of TOI-942 and TOI-421 systems
Carleo, Ilaria; Vidotto, Aline A.; Kubyshkina, Daria +3 more
At young ages, when radiation from the host star is high, and the planet is hot and inflated after formation, planetary atmospheric mass-loss can be extremely strong compared to older planets. In turn, stellar winds are faster and denser for young stars compared to evolved main-sequence stars. Their interaction with escaping planetary atmospheres …
The photo-astrometric vertical tracer density of the Milky Way - II. Results from Gaia
Everall, Andrew; Boubert, Douglas; Grand, Robert J. J. +2 more
We use Gaia photometry and astrometry to estimate the vertical spatial structure of the Milky Way at the Solar radius, formally accounting for sample incompleteness (the selection function) and parallax measurement uncertainty. Our results show impressive precision demonstrating the power of the Gaia data. However, systematic errors dominate the p…
Two decades of X-ray observations of the isolated neutron star RX J1856.5 - 3754: detection of thermal and non-thermal hard X-rays and refined spin-down measurement
Mereghetti, Sandro; Turolla, Roberto; Tiengo, Andrea +6 more
The soft X-ray pulsar RX J1856.5 - 3754 is the brightest member of a small class of thermally emitting, radio-silent, isolated neutron stars. Its X-ray spectrum is almost indistinguishable from a blackbody with $kT^\infty \approx {60}\, {\rm eV}$, but evidence of harder emission above $\sim {1}\, {\rm keV}$ has been recently found. We report on a …
MUSE-ALMA haloes VII: survey science goals & design, data processing and final catalogues
Hayes, M.; Kacprzak, G. G.; Kuntschner, H. +16 more
The gas cycling in the circumgalactic regions of galaxies is known to be multi-phase. The MUSE-ALMA Haloes survey gathers a large multi-wavelength observational sample of absorption and emission data with the goal to significantly advance our understanding of the physical properties of such CGM gas. A key component of the MUSE-ALMA Haloes survey i…
Galaxy source counts at 7.7, 10, and 15 µm with the James Webb Space Telescope
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +7 more
We present mid-infrared (IR) galaxy number counts based on the Early Release Observations obtained by the James Webb Space Telescope (JWST) at 7.7-, 10-, and 15-µm (F770W, F1000W, and F1500W, respectively) bands of the Mid-Infrared Instrument (MIRI). Due to the superior sensitivity of JWST, the 80-per cent completeness limits reach 0.32, 0.7…
Homogeneous transit timing analyses of 10 exoplanet systems
Aksaker, N.; Yılmaz, M.; Southworth, J. +19 more
We study the transit timings of 10 exoplanets in order to investigate potential transit timing variations in them. We model their available ground-based light curves, some presented here and others taken from the literature, and homogeneously measure the mid-transit times. We statistically compare our results with published values and find that th…
SU Lyn - a transient symbiotic star
Iłkiewicz, Krystian; Mikołajewska, Joanna; Scaringi, Simone +3 more
SU Lyn is a binary system composed of a white dwarf and a red giant star. Although it is known to be bright and variable at X-ray wavelengths, the optical counterpart of the source appeared as a single red giant without prominent emission lines. Because of the lack of optical features typical for interacting systems, the system was classified as a…
Differential attenuation in star-forming galaxies at 0.3 ≲ z ≲ 1.5 in the SHARDS/CANDELS field
Rodighiero, G.; Feltre, A.; Franceschini, A. +21 more
We use a sample of 706 galaxies, selected as [O II]λ3727 ([O II]) emitters in the Survey for High-z Absorption Red and Dead Sources (SHARDS) on the CANDELS/GOODS-N field, to study the differential attenuation of the nebular emission with respect to the stellar continuum. The sample includes only galaxies with a counterpart in the infrared and log<…