Search Publications
Gaia DR2 study of Herbig Ae/Be stars
Mendigutía, I.; Baines, D.; Vioque, M. +2 more
Aims: We use Gaia Data Release 2 (DR2) to place 252 Herbig Ae/Be stars in the Hertzsprung-Russell diagram and investigate their characteristics and properties.
Methods: For all known Herbig Ae/Be stars with parallaxes in Gaia DR2, we collected their atmospheric parameters and photometric and extinction values from the literature. To thes…
Detection of He I λ10830 Å absorption on HD 189733 b with CARMENES high-resolution transmission spectroscopy
Schmitt, J. H. M. M.; Alonso-Floriano, F. J.; Sánchez-López, A. +35 more
We present three transit observations of HD 189733 b obtained with the high-resolution spectrograph CARMENES at Calar Alto. A strong absorption signal is detected in the near-infrared He I triplet at 10830 Å in all three transits. During mid-transit, the mean absorption level is 0.88 ± 0.04% measured in a ±10 km s-1 range at a net blues…
Gaia Data Release 2. Summary of the variability processing and analysis results
Mazeh, T.; Zucker, S.; Szabados, L. +60 more
Context. The Gaia Data Release 2 (DR2) contains more than half a million sources that are identified as variable stars.
Aims: We summarise the processing and results of the identification of variable source candidates of RR Lyrae stars, Cepheids, long-period variables (LPVs), rotation modulation (BY Dra-type) stars, δ Scuti and SX Phoenicis s…
Gaia Data Release 2. The catalogue of radial velocity standard stars
Smith, M.; Gosset, E.; Guy, L. P. +39 more
Aims: The Radial Velocity Spectrometer (RVS) on board the ESA satellite mission Gaia has no calibration device. Therefore, the radial velocity zero point needs to be calibrated with stars that are proved to be stable at a level of 300 m s-1 during the Gaia observations.
Methods: We compiled a dataset of ~71 000 radial velocity…
Reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
Weiler, M.; Maíz Apellániz, J.
Context. The second data release (DR2) from the European Space Agency mission Gaia took place on April 2018. DR2 included photometry for more than 1.3 × 109 sources in the three bands G, GBP, and GRP. Even though the Gaia DR2 photometry is very precise, there are currently three alternative definitions of the sensi…
Gaia Data Release 2. Processing of the photometric data
Jordi, C.; Evans, D. W.; van Leeuwen, F. +13 more
Context. The second Gaia data release is based on 22 months of mission data with an average of 0.9 billion individual CCD observations per day. A data volume of this size and granularity requires a robust and reliable but still flexible system to achieve the demanding accuracy and precision constraints that Gaia is capable of delivering.
Aims…
3D shape of Orion A from Gaia DR2
Meingast, Stefan; Alves, João; Bouy, Hervé +16 more
We use the Gaia DR2 distances of about 700 mid-infrared selected young stellar objects in the benchmark giant molecular cloud Orion A to infer its 3D shape and orientation. We find that Orion A is not the fairly straight filamentary cloud that we see in (2D) projection, but instead a cometary-like cloud oriented toward the Galactic plane, with two…
The CARMENES search for exoplanets around M dwarfs . First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems
Schmitt, J. H. M. M.; Rebolo, R.; del Burgo, C. +166 more
Context. The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M dwarfs included in the CARMENES sample had been observed before with HIRES and HARPS and either were reported to have one short period planetary companion (GJ 15 A, GJ 176, GJ 436, GJ 536 and GJ 1148) or are multiple planetary systems (…
Main sequence of star forming galaxies beyond the Herschel confusion limit
Buat, V.; Małek, K.; Burgarella, D. +7 more
Context. Deep far-infrared (FIR) cosmological surveys are known to be affected by source confusion, causing issues when examining the main sequence (MS) of star forming galaxies. In the past this has typically been partially tackled by the use of stacking. However, stacking only provides the average properties of the objects in the stack.
Aim…
The distribution of stars around the Milky Way's central black hole. II. Diffuse light from sub-giants and dwarfs
Nogueras-Lara, F.; Gallego-Calvente, A. T.; Dong, H. +4 more
Context. This is the second of three papers that search for the predicted stellar cusp around the Milky Way's central black hole, Sagittarius A*, with new data and methods.
Aims: We aim to infer the distribution of the faintest stellar population currently accessible through observations around Sagittarius A*.
Methods: We used adaptive o…