Search Publications
TOI-1268b: The youngest hot Saturn-mass transiting exoplanet
Fridlund, M.; Pallé, E.; Guenther, E. W. +41 more
We report the discovery of TOI-1268b, a transiting Saturn-mass planet from the TESS space mission. With an age of less than 1 Gyr, derived from various age indicators, TOI-1268b is the youngest Saturn-mass planet known to date; it contributes to the small sample of well-characterised young planets. It has an orbital period of P = 8.1577080 ± 0.000…
Microlensing and the type Ia supernova iPTF16geu
Diego, J. M.; Goobar, A.; Mörtsell, E. +5 more
The observed magnifications and light curves of the quadruply imaged iPTF16geu supernova (SN) offers a unique opportunity to study a lens system with a variety of independent constraints. The four observed positions can be used to constrain the macrolens model. The magnifications and light curves at the four SN positions are more useful to constra…
In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
Rouan, D.; Ménard, F.; Henning, T. +48 more
Context. HD 95086 is a young nearby Solar System analog hosting a giant exoplanet orbiting at 57 au from the star between an inner and outer debris belt. The existence of additional planets has been suggested as the mechanism that maintains the broad cavity between the two belts.
Aims: We present a dedicated monitoring of HD 95086 with the VL…
Structure and evolution of ultra-massive white dwarfs in general relativity
Córsico, Alejandro H.; Rebassa-Mansergas, Alberto; Althaus, Leandro G. +4 more
Context. Ultra-massive white dwarfs (M⋆ ≳ 1.05 M⊙) are of utmost importance in view of the role they play in type Ia supernovae explosions, merger events, the existence of high-magnetic -field white dwarfs, and the physical processes in the super asymptotic giant branch phase.
Aims: We aim to present the first set of con…
No correlation of the Lyman continuum escape fraction with spectral hardness
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +25 more
The properties that govern the production and escape of hydrogen-ionizing photons (Lyman continuum, LyC; with energies > 13.6 eV) in star-forming galaxies are still poorly understood, but they are key to identifying and characterizing the sources that reionized the Universe. Here we empirically explore the relation between the hardness of ioniz…
Inspection of 19 globular cluster candidates in the Galactic bulge with the VVV survey
Minniti, D.; Ripepi, V.; Fernández-Trincado, J. G. +4 more
Context. The census of the globular clusters (GCs) in the Milky Way is still a work in progress. The advent of new deep surveys has made it possible to discover many new star clusters both in the Galactic disk and bulge, but many of these new candidates have not yet been studied in detail, leaving a veil on their true physical nature.
Aims: W…
Long-period Ap stars discovered with TESS data: The northern ecliptic hemisphere
Kurtz, D. W.; Mathys, G.; Holdsworth, D. L.
The rotation periods of the magnetic Ap stars span five to six orders of magnitude. While it is well established that period differentiation must have taken place at the pre-main sequence stage, the physical processes that lead to it remain elusive. The existence of Ap stars that have rotation periods of tens to hundreds of years is particularly i…
Eruptions from coronal bright points: A spectroscopic view by IRIS of a mini-filament eruption, QSL reconnection, and reconnection-driven outflows
Madjarska, Maria S.; Wiegelmann, Thomas; Mackay, Duncan H. +2 more
Context. Our study investigates a mini-filament eruption associated with cancelling magnetic fluxes. The eruption originates from a small-scale loop complex commonly known as a coronal bright point (CBP). The event is uniquely recorded in both the imaging and spectroscopic data taken with the Interface Region Imaging Spectrograph (IRIS).
Aims…
The outermost stellar halo of NGC 5128 (Centaurus A): Radial structure
Rejkuba, M.; Greggio, L.; Crnojević, D. +2 more
Context. The extended stellar halos of galaxies contain important clues for investigating their assembly history and evolution.
Aims: We investigate the resolved stellar content and the extended halo of NGC 5128 as a function of galactocentric distance, and trace the halo outward to its currently detectable limits.
Methods: We used Hubbl…
Near-ultraviolet to visible spectroscopy of the Themis and Polana-Eulalia complex families
Tatsumi, E.; Licandro, J.; Popescu, M. +2 more
Context. Spectrophotometry data of asteroids obtained in the 1980s showed that there are large variations in their near-ultraviolet (NUV) reflectance spectra. Reflectance spectra at NUV wavelengths are important because they help detect the presence of hydrated minerals and organics on the asteroid surfaces. However, the NUV wavelength region has …