Search Publications
The large trans-Neptunian object 2002 TC302 from combined stellar occultation, photometry, and astrometry data
Colas, F.; Mottola, S.; Gutiérrez, P. J. +78 more
Context. Deriving physical properties of trans-Neptunian objects is important for the understanding of our Solar System. This requires observational efforts and the development of techniques suitable for these studies.
Aims: Our aim is to characterize the large trans-Neptunian object (TNO) 2002 TC302.
Methods: Stellar occultat…
High-resolution spectroscopic study of massive blue and red supergiants in Perseus OB1. I. Definition of the sample, membership, and kinematics
Lennon, D. J.; Herrero, A.; Urbaneja, M. A. +5 more
Context. The Perseus OB1 association, including the h and χ Persei double cluster, is an interesting laboratory for the investigation of massive star evolution as it hosts one of the most populous groupings of blue and red supergiants (Sgs) in the Galaxy at a moderate distance and extinction.
Aims: We discuss whether the massive O-type, and b…
EXTraS discovery of an X-ray superflare from an L dwarf
Stelzer, Beate; Esposito, Paolo; Tiengo, Andrea +13 more
We present the first detection of an X-ray flare from an ultracool dwarf of spectral class L. The event was identified in the EXTraS database of XMM-Newton variable sources, and its optical counterpart, J0331-27, was found through a cross-match with the Dark Energy Survey Year 3 release. Next to an earlier four-photon detection of Kelu-1, J0331-27…
MCMCI: A code to fully characterise an exoplanetary system
Bonfanti, A.; Gillon, M.
Context. Useful information can be retrieved by analysing the transit light curve of a planet-hosting star or induced radial velocity oscillations. However, inferring the physical parameters of the planet, such as mass, size, and semi-major axis, requires preliminary knowledge of some parameters of the host star, especially its mass or radius, whi…
Heavy-metal enrichment of intermediate He-sdOB stars: the pulsators Feige 46 and LS IV-14°116 revisited
Heber, U.; Latour, M.; Irrgang, A. +3 more
Hot subdwarf stars of spectral types O and B represent a poorly understood phase in the evolution of low-mass stars, in particular of close compact binaries. A variety of phenomena are observed, which make them important tools for several astronomical disciplines. For instance, the richness of oscillations of many subdwarfs are important for aster…
Processes governing the VIS/NIR spectral reflectance behavior of lunar swirls
Wöhler, C.; Grumpe, A.; Bhatt, M. +5 more
We investigated six bright swirls associated with magnetic anomalies of variable strength using Chandrayaan-1 Moon Mineralogy Mapper (M3) hyperspectral image data. We examined the 3 µm absorption band generally ascribed to solar wind-induced OH/H2O and spectral trends in the near-infrared wavelength range at on-swirl an…
Planet-induced spirals in the circumbinary disk of GG Tauri A
Chapillon, E.; Beck, T. L.; Guilloteau, S. +10 more
Context. ALMA high angular resolution observations of the dust and CO emission have already revealed signatures of protoplanets embedded in protoplanetary disks. These detections are around single T Tauri stars, while exoplanet surveys reveal that planets can also form in binary (or multiple) systems, either in circumstellar or circumbinary orbits…
When do solar erupting hot magnetic flux ropes form?
Cheng, X.; Zhang, J.; Patsourakos, S. +2 more
Aims: We investigate the formation times of eruptive magnetic flux ropes relative to the onset of solar eruptions, which is important for constraining models of coronal mass ejection (CME) initiation.
Methods: We inspected uninterrupted sequences of 131 Å images that spanned more than eight hours and were obtained by the Atmospheric Imag…
Interstellar oxygen along the line of sight of Cygnus X-2
Waters, L. B. F. M.; Mutschke, H.; Costantini, E. +7 more
Interstellar dust permeates our Galaxy and plays an important role in many physical processes in the diffuse and dense regions of the interstellar medium (ISM). High-resolution X-ray spectroscopy, coupled with modelling based on laboratory dust measurements, provides a unique probe for investigating the interstellar dust properties along our line …
The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B)
Schmitt, J. H. M. M.; Amado, P. J.; Bauer, F. F. +27 more
Aims: We report on radial velocity time series for two M0.0 V stars, GJ 338 B and GJ 338 A, using the CARMENES spectrograph, complemented by ground-telescope photometry from Las Cumbres and Sierra Nevada observatories. We aim to explore the presence of small planets in tight orbits using the spectroscopic radial velocity technique.
Metho…