Search Publications
YBC: a stellar bolometric corrections database with variable extinction coefficients. Application to PARSEC isochrones
Fu, Xiaoting; Girardi, Léo; Marigo, Paola +7 more
We present the YBC database of stellar bolometric corrections, in which we homogenise widely used theoretical stellar spectral libraries and provide BCs for many popular photometric systems, including Gaia filters. The database can easily be extended to additional photometric systems and stellar spectral libraries. The web interface allows users t…
Structure and kinematics of the Taurus star-forming region from Gaia-DR2 and VLBI astrometry
Bouy, H.; Covey, K.; Sarro, L. M. +9 more
Aims: We take advantage of the second data release of the Gaia space mission and the state-of-the-art astrometry delivered from very long baseline interferometry observations to revisit the structure and kinematics of the nearby Taurus star-forming region.
Methods: We apply a hierarchical clustering algorithm for partitioning the stars i…
The MUSE-Wide Survey: survey description and first data release
Steinmetz, M.; Diener, C.; Enke, H. +17 more
We present the MUSE-Wide survey, a blind, 3D spectroscopic survey in the CANDELS/GOODS-S and CANDELS/COSMOS regions. The final survey will cover 100 × 1 arcmin2 MUSE fields. Each MUSE-Wide pointing has a depth of one hour and hence targets more extreme and more luminous objects over ten times the area of the MUSE-Deep fields. The legacy…
The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +6 more
Comprehensive spectral analyses of the Galactic Wolf-Rayet stars of the nitrogen sequence (i.e. the WN subclass) have been performed in a previous paper. However, the distances of these objects were poorly known. Distances have a direct impact on the "absolute" parameters, such as luminosities and mass-loss rates. The recent Gaia Data Release (DR2…
High-resolution confirmation of an extended helium atmosphere around WASP-107b
Aceituno, J.; Ehrenreich, D.; Lovis, C. +7 more
Context. Probing the evaporation of exoplanet atmospheres is key to understanding the formation and evolution of exoplanetary systems. The main tracer of evaporation in the UV is the Lyman-α transition, which can reveal extended exospheres of neutral hydrogen. Recently, the near-infrared (NIR) metastable helium triplet (10 833 Å) revealed extended…
Testing massive star evolution, star formation history, and feedback at low metallicity. Spectroscopic analysis of OB stars in the SMC Wing
Hamann, W. -R.; Gallagher, J. S.; Oskinova, L. M. +6 more
Stars that start their lives with spectral types O and early B are the progenitors of core-collapse supernovae, long gamma-ray bursts, neutron stars, and black holes. These massive stars are the primary sources of stellar feedback in star-forming galaxies. At low metallicities, the properties of massive stars and their evolution are not yet fully …
Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). II. A broadened sodium feature on the ultra-hot giant WASP-76b
Heng, K.; Ségransan, D.; Deline, A. +18 more
High-resolution optical spectroscopy is a powerful tool to characterise exoplanetary atmospheres from the ground. The sodium D lines, with their large cross sections, are especially suited to studying the upper layers of atmospheres in this context. We report on the results from Hot Exoplanet Atmosphere Resolved with Transit Spectroscopy survey (H…
Gaia Data Release 2. Cross-match with external catalogues: algorithms and results
Marinoni, S.; Marrese, P. M.; Altavilla, G. +1 more
Context. Although the Gaia catalogue on its own is a very powerful tool, it is the combination of this high-accuracy archive with other archives that will truly open up amazing possibilities for astronomical research. The advanced interoperation of archives is based on cross-matching, leaving the user with the feeling of working with one single da…
Hunting for open clusters in Gaia DR2: the Galactic anticentre
Castro-Ginard, A.; Jordi, C.; Luri, X. +2 more
Context. The Gaia Data Release 2 (DR2) provided an unprecedented volume of precise astrometric and excellent photometric data. In terms of data mining the Gaia catalogue, machine learning methods have shown to be a powerful tool, for instance in the search for unknown stellar structures. Particularly, supervised and unsupervised learning methods c…
He I λ 10 830 Å in the transmission spectrum of HD209458 b
Schmitt, J. H. M. M.; Alonso-Floriano, F. J.; Sánchez-López, A. +27 more
Context. Recently, the He I triplet at 10 830 Å was rediscovered as an excellent probe of the extended and possibly evaporating atmospheres of close-in transiting planets. This has already resulted in detections of this triplet in the atmospheres of a handful of planets, both from space and from the ground. However, while a strong signal is expect…