Search Publications
Missions
Journals
Publication Years
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…
The Optical to Infrared Extinction Law of Magellanic Clouds Based on Red Supergiants and Classical Cepheids
Wang, Shu; Chen, Xiaodian
Precise interstellar dust extinction laws are important to infer the intrinsic properties of reddened objects and correctly interpret observations. In this work, we attempt to measure the optical-infrared extinction laws of the Large and Small Magellanic Clouds (LMC and SMC) by using red supergiant (RSG) stars and classical Cepheids as extinction …
Deciphering the Slow-rise Precursor of a Major Coronal Mass Ejection
Peter, H.; Solanki, S. K.; Aulanier, G. +3 more
Coronal mass ejections are explosive plasma phenomena prevalently occurring on the Sun and probably on other magnetically active stars. However, how their pre-eruptive configuration evolves toward the main explosion remains elusive. Here, based on comprehensive observations of a long-duration precursor in an event on 2012 March 13, we determine th…
Numerical Study on Excitation of Turbulence and Oscillation in Above-the-loop-top Region of a Solar Flare
Reeves, Katharine K.; Takasao, Shinsuke; Shibata, Kengo
Extreme-ultraviolet imaging spectroscopic observations often show an increase in line width around the loop-top or above-the-loop-top (ALT) region of solar flares, suggestive of turbulence. In addition, recent spectroscopic observations found the oscillation in the Doppler velocity around the ALT region. We performed 3D magnetohydrodynamic (MHD) s…