Search Publications
Missions
Journals
Publication Years
A Pilot Radio Search for Magnetic Activity in Directly Imaged Exoplanets
Berger, E.; Cendes, Y.; Williams, P. K. G.
We present the first systematic search for GHz frequency radio emission from directly imaged exoplanets using Very Large Array observations of sufficient angular resolution to separate the planets from their host stars. We obtained results for five systems and eight exoplanets located at ≲50 pc through new observations (Ross 458, GU Psc, and 51 Er…
The disk of FU Orionis viewed with MATISSE/VLTI. First interferometric observations in L and M bands
Waters, L. B. F. M.; Zhu, Z.; Liu, H. B. +30 more
Aims: We studied the accretion disk of the archetypal eruptive young star FU Orionis with the use of mid-infrared interferometry, which enabled us to resolve the innermost regions of the disk down to a spatial resolution of 3 milliarcseconds (mas) in the L band, that is, within 1 au of the protostar.
Methods: We used the interferometric …
Stellar dating using chemical clocks and Bayesian inference
Chaplin, W. J.; Moya, A.; Sarro, L. M. +3 more
Context. Dating stars is a major challenge with a deep impact on many astrophysical fields. One of the most promising techniques for this is using chemical abundances. Recent space- and ground-based facilities have improved the quantity of stars with accurate observations. This has opened the door for using Bayesian inference tools to maximise the…
Multiple Stellar Populations of Globular Clusters from Homogeneous Ca-CN-CH-NH Photometry. VII. Metal-poor Populations in 47 Tucanae (NGC 104)
Lee, Jae-Woo
We present new large field-of-view (~1°×1°) Ca-CN photometry of the prototypical metal-rich globular cluster 47 Tucanae (NGC 104). Our results are the following. (1) The populational number ratios of the red giant branch (RGB) and red horizontal branch (RHB) are in excellent agreement: n(CN-w):n(CN-s) = 30:70 (±1-2), where the CN-w and CN-s stand …
Observations of a Flare-ignited Broad Quasiperiodic Fast-propagating Wave Train
Liu, Ying D.; Hu, Huidong; Shen, Yuandeng +6 more
Large-scale extreme-ultraviolet (EUV) waves are frequently observed as an accompanying phenomenon of flares and coronal mass ejections (CMEs). Previous studies mainly focused on EUV waves with single wave fronts that are generally thought to be driven by the lateral expansion of CMEs. Using high spatiotemporal resolution multi-angle imaging observ…
Variable Stars in the Giant Satellite Galaxy Antlia 2
Erkal, Denis; Belokurov, Vasily; Li, Ting S. +3 more
We report 350 pulsating variable stars found in four DECam fields (~12 deg2) covering the Antlia 2 satellite galaxy. The sample of variables includes 318 RR Lyrae stars and eight anomalous Cepheids in the galaxy. Reclassification of several objects designated previously to be RR Lyrae as anomalous Cepheids get rid of the satellite's sta…
Pearls on a String: Numerous Stellar Clusters Strung Along the Same Orbit
Rix, Hans-Walter; Fürnkranz, Verena; Coronado, Johanna
Stars originate from the dense interstellar medium, which exhibits filamentary structure to scales of ~1 kpc in galaxies like our Milky Way. We explore quantitatively how much resulting large-scale correlation there is among different stellar clusters and associations in orbit-phase space, characterized here by actions and angles. As a starting po…
Galactic Cosmic-Ray Propagation in the Inner Heliosphere: Improved Force-field Model
Peter, Annika H. G.; Beacom, John F.; Li, Jung-Tsung
A key goal of heliophysics is to understand how cosmic rays propagate in the solar system's complex, dynamic environment. One observable is solar modulation, i.e., how the flux and spectrum of cosmic rays change as they propagate inward. We construct an improved force-field model, taking advantage of new measurements of magnetic power spectral den…
Escape from the Bermuda cluster: Orphanization by multiple stellar ejections
Weiler, M.; Maíz Apellániz, J.; Barbá, R. H. +1 more
Context. Dynamical interactions in young stellar clusters can eject massive stars early in their lives and significantly alter their mass functions. If all of the most massive stars are lost, we are left with an orphan cluster.
Aims: We study the Bermuda cluster (Villafranca O-014 NW), the most significant young stellar group in the North Ame…
The Ultramassive White Dwarfs of the Alpha Persei Cluster
Caiazzo, Ilaria; Richer, Harvey B.; Heyl, Jeremy +2 more
We searched through the entire Gaia EDR3 candidate white dwarf catalog for stars with proper motions and positions that are consistent with them having escaped from the Alpha Persei cluster within the past 81 Myr, the age of the cluster. In this search we found five candidate white dwarf escapees from Alpha Persei and obtained spectra for all of t…