Search Publications
The CARMENES search for exoplanets around M dwarfs. Two planets on opposite sides of the radius gap transiting the nearby M dwarf LTT 3780
Tamura, M.; Nagel, E.; Amado, P. J. +97 more
We present the discovery and characterisation of two transiting planets observed by the Transiting Exoplanet Survey Satellite (TESS) orbiting the nearby (d⋆ ≈ 22 pc), bright (J ≈ 9 mag) M3.5 dwarf LTT 3780 (TOI-732). We confirm both planets and their association with LTT 3780 via ground-based photometry and determine their masses using …
The Milky Way Cepheid Leavitt law based on Gaia DR2 parallaxes of companion stars and host open cluster populations
Mérand, Antoine; Riess, Adam G.; Breuval, Louise +12 more
Aims: Classical Cepheids provide the foundation for the empirical extragalactic distance ladder. Milky Way Cepheids are the only stars in this class accessible to trigonometric parallax measurements. However, the parallaxes of Cepheids from the second Gaia data release (GDR2) are affected by systematics because of the absence of chromaticity …
Observed sizes of planet-forming disks trace viscous spreading
van Dishoeck, E. F.; Rosotti, G.; Trapman, L. +2 more
Context. The evolution of protoplanetary disks is dominated by the conservation of angular momentum, where the accretion of material onto the central star is fed by the viscous expansion of the outer disk or by disk winds extracting angular momentum without changing the disk size. Studying the time evolution of disk sizes therefore allows us to di…
The population of hot subdwarf stars studied with Gaia. III. Catalogue of known hot subdwarf stars: Data Release 2
Geier, S.
In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys and the availability of new all-sky data from ground-based photometric surveys and the Gaia mission Data Release 2, we compiled an updated catalogue of the known hot subdwarf stars. The catalogue contains 5874 unique sources including 528 previously unknown h…
Neutron-capture elements in dwarf galaxies. III. A homogenized analysis of 13 dwarf spheroidal and ultra-faint galaxies
Hansen, C. J.; Skúladóttir, Á.; Grebel, E. K. +3 more
Context. We present a large homogeneous set of stellar parameters and abundances across a broad range of metallicities, involving 13 classical dwarf spheroidal (dSph) and ultra-faint dSph (UFD) galaxies. In total, this study includes 380 stars in Fornax, Sagittarius, Sculptor, Sextans, Carina, Ursa Minor, Draco, Reticulum II, Bootes I, Ursa Major …
Reviving old controversies: is the early Galaxy flat or round?. Investigations into the early phases of the Milky Way's formation through stellar kinematics and chemical abundances
Bonifacio, P.; Caffau, E.; Spite, M. +4 more
We analysed a set of very metal-poor stars, for which accurate chemical abundances have been obtained as part of the ESO Large Program "First stars" in the light of the Gaia DR2 data. The kinematics and orbital properties of the stars in the sample show they probably belong to the thick disc, partially heated to halo kinematics, and to the accrete…
The Solar Orbiter Heliospheric Imager (SoloHI)
St. Cyr, O. C.; Plunkett, S. P.; Lamy, P. L. +45 more
Aims: We present the design and pre-launch performance of the Solar Orbiter Heliospheric Imager (SoloHI) which is an instrument prepared for inclusion in the ESA/NASA Solar Orbiter mission, currently scheduled for launch in 2020.
Methods: The goal of this paper is to provide details of the SoloHI instrument concept, design, and pre-fligh…
A stripped helium star in the potential black hole binary LB-1
Geier, S.; Heber, U.; Irrgang, A. +2 more
Context. The recently claimed discovery of a massive (MBH = 68-13+11 M⊙) black hole in the Galactic solar neighborhood has led to controversial discussions because it severely challenges our current view of stellar evolution.
Aims: A crucial aspect for the determination of the mass of the unseen bla…
Hydrodynamic simulations unravel the progenitor-supernova-remnant connection in SN 1987A
Miceli, M.; Bocchino, F.; Orlando, S. +8 more
Context. Massive stars end their lives in catastrophic supernova (SN) explosions. Key information on the explosion processes and on the progenitor stars can be extracted from observations of supernova remnants (SNRs), which are the outcome of SNe. Deciphering these observations, however, is challenging because of the complex morphology of SNRs.
Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data
Maurin, D.; Génolini, Y.; Derome, L. +2 more
Context. The Alpha Magnetic Spectrometer (AMS-02) measured several secondary-to-primary ratios enabling a detailed study of Galactic cosmic-ray transport.
Aims: We constrain previously derived benchmark scenarios (based on AMS-02 B/C data only) using other secondary-to-primary ratios to test the universality of transport and the presence of a…