Search Publications
Generalised model-independent characterisation of strong gravitational lenses. II. Transformation matrix between multiple images
Wagner, J.; Tessore, N.
We determine the transformation matrix that maps multiple images with identifiable resolved features onto one another and that is based on a Taylor-expanded lensing potential in the vicinity of a point on the critical curve within our model-independent lens characterisation approach. From the transformation matrix, the same information about the p…
The Caviar software package for the astrometric reduction of Cassini ISS images: description and examples
Baillie, K.; Cooper, N. J.; Lainey, V. +6 more
Aims: Caviar is a software package designed for the astrometric measurement of natural satellite positions in images taken using the Imaging Science Subsystem (ISS) of the Cassini spacecraft. Aspects of the structure, functionality, and use of the software are described, and examples are provided. The integrity of the software is demonstrated…
Strong Lensing Modeling in Galaxy Clusters as a Promising Method to Test Cosmography. I. Parametric Dark Energy Models
Jullo, Eric; Limousin, Marceau; Magaña, Juan +3 more
In this paper we probe five cosmological models for which the dark energy equation of state parameter, w(z), is parameterized as a function of redshift using strong lensing data in the galaxy cluster Abell 1689. We constrain the parameters of the w(z) functions by reconstructing the lens model under each one of these cosmologies with strong lensin…
Asteroseismic potential of CHEOPS
Moya, A.; Bonfanti, A.; Barrado, D. +3 more
Context. Asteroseismology has been impressively boosted during the last decade mainly thanks to space missions such as Kepler/K2 and CoRoT. This has a large impact, in particular, in exoplanetary sciences since the accurate characterization of the exoplanets is convoluted in most cases with the characterization of their hosting star. In the decade…
Hubble Tarantula Treasury Project - VI. Identification of pre-main-sequence stars using machine-learning techniques
Gouliermis, Dimitrios A.; Anderson, Jay; Grebel, Eva K. +9 more
The Hubble Tarantula Treasury Project (HTTP) has provided an unprecedented photometric coverage of the entire starburst region of 30 Doradus down to the half Solar mass limit. We use the deep stellar catalogue of HTTP to identify all the pre-main-sequence (PMS) stars of the region, i.e. stars that have not started their lives on the main-sequence …
Statistical analysis of UV spectra of a quiescent prominence observed by IRIS
Heinzel, P.; Jejčič, S.; Gunár, S. +2 more
Context. The paper analyzes the structure and dynamics of a quiescent prominence that occurred on October 22, 2013 and was observed by several instruments including the Interface Region Imaging Spectrograph (IRIS).
Aims: We aim to determine the physical characteristics of the observed prominence using Mg II k and h (2796 and 2803 Å), C II (13…
HAT-TR-318-007: A Double-lined M Dwarf Binary with Total Secondary Eclipses Discovered by HATNet and Observed by K2
Latham, D. W.; Bhatti, W.; Fulton, B. J. +11 more
We report the discovery by the HATNet survey of HAT-TR-318-007, a P=3.34395390+/- 0.00000020 day period detached double-lined M dwarf binary with total secondary eclipses. We combine radial velocity (RV) measurements from TRES/FLWO 1.5 m and time-series photometry from HATNet, FLWO 1.2 m, BOS 0.8 m, and NASA K2 Campaign 5, to determine the masses …
Testing a double AGN hypothesis for Mrk 273
Sanders, D. B.; Iwasawa, K.; Evans, A. S. +3 more
The ultra-luminous infrared galaxy (ULIRG) Mrk 273 contains two infrared nuclei, N and SW, separated by 1 arcsecond. A Chandra observation has identified the SW nucleus as an absorbed X-ray source with NH 4 × 1023 cm-2 but also hinted at the possible presence of a Compton-thick AGN in the N nucleus, where a black h…
Traversable braneworld wormholes supported by astrophysical observations
Wang, Deng; Meng, Xin-He
In this study, we investigate the characteristics and properties of a traversable wormhole constrained by the current astrophysical observations in the framework of modified theories of gravity (MOG). As a concrete case, we study traversable wormhole space-time configurations in the Dvali-Gabadadze-Porrati (DGP) braneworld scenario, which are supp…
AKARI mid-infrared slitless spectroscopic survey of star-forming galaxies at z ≲ 0.5
Im, M.; White, G. J.; Inami, H. +24 more
Context. Deep mid-infrared (MIR) surveys have revealed numerous strongly star-forming galaxies at redshift z ≲ 2. Their MIR fluxes are produced by a combination of continuum and polycyclic aromatic hydrocarbon (PAH) emission features. The PAH features can dominate the total MIR flux, but are difficult to measure without spectroscopy.
Aims: We…