Search Publications
Abundance of SiC2 in carbon star envelopes
Alcolea, J.; Cernicharo, J.; Goicoechea, J. R. +6 more
Context. Silicon carbide dust is ubiquitous in circumstellar envelopes around C-rich asymptotic giant branch (AGB) stars. However, the main gas-phase precursors leading to the formation of SiC dust have not yet been identified. The most obvious candidates among the molecules containing an Si-C bond detected in C-rich AGB stars are SiC2,…
An updated stellar census of the Quintuplet cluster
Najarro, F.; Clark, J. S.; Dong, H. +3 more
Context. Found within the central molecular zone, the Quintuplet is one of the most massive young clusters in the Galaxy. As a consequence it offers the prospect of constraining stellar formation and evolution in extreme environments. However, current observations suggest that it comprises a remarkably diverse stellar population that is difficult …
Glimpses of the past activity of Sgr A★ inferred from X-ray echoes in Sgr C
Ponti, G.; Morris, M. R.; Terrier, R. +6 more
Context. For a decade now, evidence has accumulated that giant molecular clouds located within the central molecular zone of our Galaxy reflect X-rays coming from past outbursts of the Galactic supermassive black hole. However, the number of illuminating events as well as their ages and durations are still unresolved questions.
Aims: We aim t…
A search for new supernova remnant shells in the Galactic plane with H.E.S.S.
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +262 more
A search for new supernova remnants (SNRs) has been conducted using TeV γ-ray data from the H.E.S.S. Galactic plane survey. As an identification criterion, shell morphologies that are characteristic for known resolved TeV SNRs have been used. Three new SNR candidates were identified in the H.E.S.S. data set with this method. Extensive multiwavelen…
Tracking of an electron beam through the solar corona with LOFAR
Strassmeier, K. G.; McKean, J. P.; Eislöffel, J. +88 more
The Sun's activity leads to bursts of radio emission, among other phenomena. An example is type-III radio bursts. They occur frequently and appear as short-lived structures rapidly drifting from high to low frequencies in dynamic radio spectra. They are usually interpreted as signatures of beams of energetic electrons propagating along coronal mag…
The CARMENES search for exoplanets around M dwarfs. The warm super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779) and LP 819-052 (GJ 1265)
Schmitt, J. H. M. M.; Amado, P. J.; Caballero, J. A. +27 more
We announce the discovery of two planetary companions orbiting around the low-mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). The discovery is based on the analysis of CARMENES radial velocity (RV) observations in the visual channel as part of its survey for exoplanets around M dwarfs. In the case of GJ 1265, CARMENES observ…
Temperature constraints from inversions of synthetic solar optical, UV, and radio spectra
Leenaarts, J.; da Silva Santos, J. M.; de la Cruz Rodríguez, J.
Context. High-resolution observations of the solar chromosphere at millimeter wavelengths are now possible with the Atacama Large Millimeter Array (ALMA), bringing with them the promise of tackling many open problems in solar physics. Observations from other ground and space-based telescopes will greatly benefit from coordinated endeavors with ALM…
Anatomy of the massive star-forming region S106. The [O I] 63 µm line observed with GREAT/SOFIA as a versatile diagnostic tool for the evolution of massive stars
Comerón, F.; Schneider, N.; Csengeri, T. +9 more
The central area (40″ × 40″) of the bipolar nebula S106 was mapped in the [O I] line at 63.2 µm (4.74 THz) with high angular (6″) and spectral (0.24 MHz) resolution, using the GREAT heterodyne receiver on board SOFIA. The spatial and spectral emission distribution of [O I] is compared to emission in the CO 16 →15, [C II] 158 µm, and CO…
High-energy environment of super-Earth 55 Cancri e. I. Far-UV chromospheric variability as a possible tracer of planet-induced coronal rain
Ehrenreich, D.; Lecavelier des Etangs, A.; Udry, S. +7 more
The high-energy X-ray to ultraviolet (XUV) irradiation of close-in planets by their host star influences their evolution and might be responsible for the existence of a population of ultra-short period planets eroded to their bare core. In orbit around a bright, nearby G-type star, the super-Earth 55 Cnc e offers the possibility to address these i…
The Arches cluster revisited. I. Data presentation and stellar census
Martins, F.; Najarro, F.; Clark, J. S. +2 more
Context. Located within the central region of the Galaxy, the Arches cluster appears to be one of the youngest, densest, and most massive stellar aggregates within the Milky Way. As such, it has the potential to be uniquely instructive laboratory for the study of star formation in extreme environments and the physics of very massive stars.
Ai…