Search Publications
The host of GRB 171205A in 3D: A resolved multiwavelength study of a rare grand-design spiral GRB host
Covino, S.; D'Elia, V.; Hartmann, D. H. +17 more
Long GRB hosts at z < 1 are usually low-mass, low-metallicity star-forming galaxies. Here we present the most detailed, spatially resolved study of the host of GRB 171205A so far, a grand-design barred spiral galaxy at z = 0.036. Our analysis includes MUSE integral field spectroscopy complemented with high-spatial-resolution UV/VIS HST imaging …
The Gaia RVS benchmark stars. II. A sample of stars selected for their Gaia high radial velocity
Ludwig, H. -G.; Bonifacio, P.; Caffau, E. +16 more
Context. The Gaia satellite has already provided the astronomical community with three data releases, and the Radial Velocity Spectrometer (RVS) on board Gaia has provided the radial velocity for 33 million stars.
Aims: When deriving the radial velocity from the RVS spectra, several stars are measured to have large values. To verify the credi…
Infrared spectra of solid-state ethanolamine: Laboratory data in support of JWST observations
Henning, Th.; Perotti, G.; Jäger, C. +4 more
Context. Ethanolamine (NH2CH2CH2OH; EA) has been identified in the gas phase of the interstellar medium within molecular clouds. Although EA has not been directly observed in the molecular ice phase, a solid-state formation mechanism has been proposed. However, the current literature lacks an estimation of the infr…
Characterization of carbon dioxide on Ganymede and Europa supported by experiments: Effects of temperature, porosity, and mixing with water
Caselli, P.; Cazaux, S.; Muñoz Caro, G. M. +8 more
Context. The surfaces of icy moons are primarily composed of water ice that can be mixed with other compounds, such as carbon dioxide. The carbon dioxide (CO2) stretching fundamental band observed on Europa and Ganymede appears to be a combination of several bands that are shifting location from one moon to another.
Aims: We invest…
3D evolution of a solar flare thermal X-ray loop-top source
Müller, D.; Nicula, B.; Krucker, S. +6 more
Context. The recent launch of Solar Orbiter has placed a solar X-ray imager (Spectrometer/Telescope for Imaging X-rays; STIX) beyond Earth orbit for the first time. This introduces the possibility of deriving the 3D locations and volumes of solar X-ray sources by combining STIX observations with those of Earth-orbiting instruments such as the Hino…
Improving the light curves of gravitationally lensed quasars with Gaia proper motion data
Schmidt, R. W.; Wambsganss, J.; Sorgenfrei, C.
Aims: We show how to significantly improve difference image analysis (DIA) of gravitationally lensed quasars over long periods of time using Gαία proper motions.
Methods: DIA requires the subtraction of a reference image from the individual images of a monitoring campaign, using stars in the field to align the images. Since the proper mo…
Discovery and characterization of a dense sub-Saturn TOI-6651b
Bieryla, Allyson; Latham, David W.; Eastman, Jason D. +13 more
We report the discovery and characterization of a transiting sub-Saturn exoplanet TOI-6651b using PARAS-2 spectroscopic observations. The host, TOI-6651 (mV ≈ 10.2), is a sub-giant, metal-rich G-type star with [Fe / H] = 0.225‑0.0450.044[Fe/H] = 0.225‑0.045+0.044, Teff = 5940 ± 110 …
Searching for compact hierarchical triple system candidates in astrometric binaries and accelerated solutions
Bashi, D.; Tokovinin, A.
Context. Compact hierarchical triple (CHT) systems, where a tertiary component orbits an inner binary, provide critical insights into stellar formation and evolution. Despite their importance, the detection of such systems, especially compact ones, remains challenging due to the complexity of their orbital dynamics and the limitations of tradition…
Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI
Henning, Thomas; Güdel, Manuel; Colina, Luis +26 more
Context. Mid-infrared imaging of exoplanets and disks is now possible with the coronographs of the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). This wavelength range unveils new features of young directly imaged systems and allows us to obtain new constraints for characterizing the atmosphere of young giant exoplanets a…
Evidence for flare-accelerated particles in large scale loops in the behind-the-limb gamma-ray solar flare of September 29, 2022
Monstein, Christian; Krucker, Säm; Veronig, Astrid M. +4 more
We report on the detection of the gamma-ray emission above 100 MeV from the solar flare of September 29, 2022, by Fermi LAT with simultaneous coverage in HXR by Solar Orbiter STIX. The Solar Orbiter-Earth separation was 178° at the time of the flare as seen from Earth, with Solar Orbiter observing the east limb. Based on STIX imaging, the flare wa…