Search Publications
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…
In-flight photometry extraction of PLATO targets. Optimal apertures for detecting extrasolar planets
Cabrera, J.; Samadi, R.; Börner, A. +7 more
Context. The ESA PLATO space mission is devoted to unveiling and characterizing new extrasolar planets and their host stars. This mission will encompass a very large (>2100 deg2) field of view, granting it the potential to survey up to one million stars depending on the final observation strategy. The telemetry budget of the spacecra…
CI Camelopardalis: The first sgB[e]-high mass X-ray binary twenty years on: A supernova imposter in our own Galaxy?
Bartlett, E. S.; Negueruela, I.; Clark, J. S.
Context. The Galactic supergiant B[e] star CI Camelopardalis (CI Cam) was the first sgB[e] star detected during an X-ray outburst. The star brightened to ∼2 Crab in the X-ray regime (∼5 × 10-8 ergs cm-2 s-1 in the 2-25 keV range) within hours before decaying to a quiescent level in less than two weeks, clearly indi…
RPC-MIP observations at comet 67P/Churyumov-Gerasimenko explained by a model including a sheath and two populations of electrons
Henri, P.; Vallières, X.; Wattieaux, G. +2 more
The response of the mutual impedance probe RPC-MIP on board Rosetta orbiter electrostatically modeled considering an unmagnetized and collisionless plasma with two Maxwellian electron populations. A vacuum sheath surrounding the probe was considered in our model in order to take the ion sheath into account that is located around the probe, which i…
Superstrong photospheric magnetic fields in sunspot penumbrae
Solanki, S. K.; Lagg, A.; van Noort, M. +2 more
Context. Recently, there have been some reports of unusually strong photospheric magnetic fields (which can reach values of over 7 kG) inferred from Hinode SOT/SP sunspot observations within penumbral regions. These superstrong penumbral fields are even larger than the strongest umbral fields on record and appear to be associated with supersonic d…