Search Publications
Solar energetic electron events measured by MESSENGER and Solar Orbiter. Peak intensity and energy spectrum radial dependences: Statistical analysis
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +10 more
Context. We present a list of 61 solar energetic electron (SEE) events measured by the MESSENGER mission and the radial dependences of some parameters associated with these SEE events. The analysis covers the period from 2010 to 2015, when the heliocentric distance of MESSENGER varied between 0.31 and 0.47 au. We also show the radial dependences f…
Monitoring the young planet host V1298 Tau with SPIRou: planetary system and evolving large-scale magnetic field
Moutou, C.; Carmona, A.; Donati, J. -F. +15 more
We report results of a spectropolarimetric monitoring of the young Sun-like star V1298 Tau based on data collected with the near-infrared spectropolarimeter SPIRou at the Canada-France-Hawaii Telescope between late 2019 and early 2023. Using Zeeman-Doppler Imaging and the Time-dependent Imaging of Magnetic Stars methods on circularly polarized spe…
Line luminosities of Galactic and Magellanic Cloud Wolf-Rayet stars
Crowther, Paul A.; Bestenlehner, Joachim M.; Rate, G.
We provide line luminosities and spectroscopic templates of prominent optical emission lines of 133 Galactic Wolf-Rayet (WR) stars by exploiting Gaia DR3 parallaxes and optical spectrophotometry, and provide comparisons with 112 counterparts in the Magellanic Clouds. Average line luminosities of the broad blue (He II λ4686, C III λλ4647,51, N III …
The orbital eccentricity distribution of planets orbiting M dwarfs
Ballard, Sarah; Sagear, Sheila
The orbital eccentricities of exoplanets orbiting M dwarf stars may significantly affect their habitability but are unknown. We extract this eccentricity distribution using a sample of transiting planets orbiting M dwarfs detected by NASA's Kepler Mission with stellar density measurements. We find planets in apparently single-transiting systems ar…
A Systematic Study of Associations between Supernova Remnants and Molecular Clouds
Chen, Zhiwei; Wang, Hongchi; Wang, Min +12 more
We universally search for evidence of kinematic and spatial correlation of supernova remnant (SNR) and molecular cloud (MC) associations for nearly all SNRs in the coverage of the Milky Way Imaging Scroll Painting CO survey, i.e., 149 SNRs, 170 SNR candidates, and 18 pure pulsar wind nebulae in 1° < l < 230° and -5.°5 < b < 5.°5. Based…
Dark dust. II. Properties in the general field of the diffuse ISM
Siebenmorgen, R.
Distance estimates derived from spectroscopy or parallax have been unified by considering extinction by large grains. The addition of such a population of what is called dark dust to models of the diffuse interstellar medium is tested against a contemporary set of observational constraints. By respecting representative solid-phase element abundanc…
PHANGS-JWST First Results: A Combined HST and JWST Analysis of the Nuclear Star Cluster in NGC 628
Sandstrom, Karin M.; Neumayer, Nadine; Kruijssen, J. M. Diederik +28 more
We combine archival Hubble Space Telescope and new James Webb Space Telescope imaging data covering the ultraviolet to mid-infrared regime to morphologically analyze the nuclear star cluster (NSC) of NGC 628, a grand-design spiral galaxy. The cluster is located in a 200 pc × 400 pc cavity lacking both dust and gas. We find roughly constant values …
High-angular resolution and high contrast observations from Y to L band at the Very Large Telescope Interferometer with the Asgard Instrumental suite
Kraus, Stefan; Gardner, Tyler; Ertel, Steve +25 more
European Southern Observatory (ESO)'s Very Large Telescope Interferometer (VLTI), Paranal, Chile, is one of the most proficient observatories in the world for high angular resolution astronomy. It has hosted several interferometric instruments operating in various bandwidths in the infrared. As a result, the VLTI has yielded countless discoveries …
Empirical Measurement of the Dynamical Ages of Three Globular Clusters and Some Considerations on the Use of the Dynamical Clock
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +3 more
We have used the "dynamical clock" to measure the level of dynamical evolution reached by three Galactic globular clusters (namely, NGC 3201, NGC 6316, and NGC 6440). This is an empirical method that quantifies the level of central segregation of blue straggler stars (BSSs) within the cluster half-mass radius by means of the ${A}_{\mathrm{rh}}^{+}…
Primordial or Secondary? Testing Models of Debris Disk Gas with ALMA
Henning, Thomas; Hughes, A. Meredith; Redfield, Seth +13 more
The origin and evolution of gas in debris disks are still not well understood. Secondary gas production from cometary material or a primordial origin have been proposed. So far, observations have mostly concentrated on CO, with only a few C observations available. We overview the C and CO content of debris disk gas and test state-of-the-art models…