Search Publications
Occultation portal: A web-based platform for data collection and analysis of stellar occultations
Souami, D.; Sicardy, B.; Gomes-Júnior, A. R. +9 more
Recording a stellar occultation is one powerful method that gives direct information about the physical properties of the occulting Solar system object. In order to obtain reliable and accurate results, simultaneous observations from different locations across-track of the projected path are of great importance. However, organizing all the observi…
A new method to measure the spectra of transiting exoplanet atmospheres using multi-object spectroscopy
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +5 more
Traditionally, ground-based spectrophotometric observations probing transiting exoplanet atmospheres have employed a linear map between comparison and target star light curves (e.g. via differential spectrophotometry) to correct for systematics contaminating the transit signal. As an alternative to this conventional method, we introduce a new Gaus…
The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+
Pattle, Kate; Ward-Thompson, Derek; Berry, David +31 more
Polarized dust emission is a key tracer in the study of interstellar medium and of star formation. The observed polarization, however, is a product of magnetic field structure, dust grain properties, and grain alignment efficiency, as well as their variations in the line of sight, making it difficult to interpret polarization unambiguously. The co…
Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
Hill, Ryley; Scott, Douglas; Dole, Hervé +3 more
The Planck list of high-redshift source candidates (the PHz catalogue) contains 2151 peaks in the cosmic infrared background, unresolved by Planck's 5 arcmin beam. Follow-up spectroscopic observations have revealed that some of these objects are $z\, {\approx }\, 2$ protoclusters and strong gravitational lenses but an unbiased survey has not yet b…
X-ray timing and spectral analysis of reverberating active galactic nuclei
Chainakun, P.; Young, A. J.; Hancock, S.
We use the publicly available XMM-Newton archive to select a sample of 20 active galactic nuclei (AGNs) known to exhibit reverberation signatures caused by the reflection of X-rays from the corona off the accretion disc that feeds the central black hole engine. Inverse Compton scattering by energetic electrons, coupled with accretion disc fluctuat…
Enhancement of double-close-binary quadruples
Zakamska, Nadia L.; Hwang, Hsiang-Chih; Fezenko, Gavin B.
Double-close-binary quadruples (2 + 2 systems) are hierarchical systems of four stars where two short-period binary systems move around their common centre of mass on a wider orbit. Using Gaia Early Data Release 3, we search for comoving pairs where both components are eclipsing binaries. We present eight 2 + 2 quadruple systems with inner orbital…
Probabilistic model for dynamic galaxy decomposition
Mandelbaum, Rachel; Rau, Markus Michael; Jagvaral, Yesukhei +1 more
In the era of precision cosmology and ever-improving cosmological simulations, a better understanding of different galaxy components such as bulges and discs will give us new insight into galactic formation and evolution. Based on the fact that the stellar populations of the constituent components of galaxies differ by their dynamical properties, …
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov-Gerasimenko
Da Deppo, Vania; Lellouch, Emmanuel; Buratti, Bonnie J. +24 more
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov-Gerasimenko. This shallow pit is one of several that later formed elsewhere on the comet, all in smooth terrain that primarily …
Water observed in the atmosphere of τ Boötis Ab with CARMENES/CAHA
Zhang, Yapeng; Gandhi, Siddharth; Brogi, Matteo +4 more
Characterizing the atmospheres of hot Jupiters is important in understanding the formation and migration of these exotic planets. However, there are still many open questions about the chemical and physical properties of these atmospheres. Here, we confirm the detection of water vapour in thermal emission from the non-transiting hot Jupiter τ Boöt…
Searching for the connection between ionizing-photon escape and the surface density of star formation at z 3
Steidel, Charles C.; Reddy, Naveen A.; Shapley, Alice +2 more
The connection between the escape fraction of ionizing photons (fesc) and star formation rate surface density (ΣSFR) is a key input for reionization models, but remains untested at high redshift. We analyse 35 z ~ 3 galaxies from the Keck Lyman Continuum Survey (KLCS) covered by deep, rest far-UV spectra of the Lyman continuu…