Search Publications
Fingerprinting the effects of hyperfine structure on CH and OH far infrared spectra using Wiener filter deconvolution
Lee, Min-Young; Menten, Karl M.; Jacob, Arshia M. +3 more
Context. Despite being a commonly observed feature, the modification of the velocity structure in spectral line profiles by hyperfine structure complicates the interpretation of spectroscopic data. This is particularly true for observations of simple molecules such as CH and OH toward the inner Galaxy, which show a great deal of velocity crowding.…
Accurate effective temperature from Hα profiles
Pasquini, L.; Ludwig, H. -G.; Porto de Mello, G. F. +4 more
Context. The determination of stellar effective temperature (Teff) in F, G, and K stars using Hα profile fitting is a quite remarkable and powerful tool because it does not depend on reddening and is only slightly sensitive to other atmospheric parameters. Nevertheless, this technique is not frequently used because of the complex proced…
Flying far and fast: the distribution of distant hypervelocity star candidates from Gaia DR2 data
de la Fuente Marcos, R.; de la Fuente Marcos, C.
Context. Hypervelocity stars move fast enough to leave the gravitational field of their home galaxies and venture into intergalactic space. The most extreme examples known have estimated speeds in excess of 1000 km s-1. These can be easily induced at the centres of galaxies via close encounters between binary stars and supermassive blac…
Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
Ginski, C.; Benisty, M.; de Boer, J. +10 more
Context. Protoplanetary disks are the birth environments of planetary systems. Therefore, the study of young, circumstellar environments is essential in understanding the processes taking place in planet formation and the evolution of planetary systems.
Aims: We detect and characterize circumstellar disks and potential companions around solar…
Halo intruders in the Galactic bulge revealed by HST and Gaia: the globular clusters Terzan 10 and Djorgovski 1
Bica, E.; Nardiello, D.; Barbuy, B. +2 more
Context. The low-latitude globular clusters Terzan 10 and Djorgovski 1 are projected in the Galactic bulge, in a Galactic region highly affected by extinction. A discrepancy of a factor of ∼2 exists in the literature in regards to the distance determination of these clusters.
Aims: We revisit the colour-magnitude diagrams (CMDs) of these two …
Dust-depletion sequences in damped Lyman-α absorbers. II. The composition of cosmic dust, from low-metallicity systems to the Galaxy
Petitjean, Patrick; De Cia, Annalisa; Andersen, Anja C. +1 more
Metals in the interstellar medium (ISM) of essentially all types of galaxies are observed to be depleted compared to the expected values. The depletion is most likely due to dust condensation in, for example, cold molecular clouds and various circumstellar and interstellar environments. The relative observed metal abundances should thereby reflect…
The CARMENES search for exoplanets around M dwarfs. Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)
Schmitt, J. H. M. M.; Amado, P. J.; Bauer, F. F. +34 more
Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the pl…
The SOPHIE search for northern extrasolar planets. XV. A warm Neptune around the M dwarf Gl 378
Bouchy, F.; Deleuil, M.; Moutou, C. +31 more
We present the detection of a warm Neptune orbiting the M dwarf Gl 378, using radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. The star was observed in the context of the SOPHIE exoplanet consortium's sub-programme dedicated to finding planets around M dwarfs. Gl 378 is an M1 star, of solar …
Ground-based optical transmission spectrum of the hot Jupiter HAT-P-1b
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +6 more
Context. Time-series spectrophotometric studies of exoplanets during transit using ground-based facilities are a promising approach to characterize their atmospheric compositions.
Aims: We aim to investigate the transit spectrum of the hot Jupiter HAT-P-1b. We compare our results to those obtained at similar wavelengths by previous space-base…
Pluto's ephemeris from ground-based stellar occultations (1988-2016)
Sicardy, B.; Gomes-Júnior, A. R.; Ortiz, J. L. +13 more
Context. From 1988 to 2016, several stellar occultations have been observed to characterise Pluto's atmosphere and its evolution. From each stellar occultation, an accurate astrometric position of Pluto at the observation epoch is derived. These positions mainly depend on the position of the occulted star and the precision of the timing.
Aims…