Search Publications
Missions
Journals
Publication Years
Planetary nebulae with Wolf-Rayet-type central stars - I. The case of the high-excitation NGC 2371
Guerrero, M. A.; Toalá, J. A.; Todt, H. +4 more
We present the analysis of the planetary nebula (PN) NGC 2371 around the [Wolf-Rayet] (WR) star WD 0722+295. Our Isaac Newton Telescope intermediate dispersion spectrograph spectra, in conjunction with archival optical and ultraviolet images, unveil in unprecedented detail the high ionization of NGC 2371. The nebula has an apparent multipolar morp…
Planetary candidates transiting cool dwarf stars from campaigns 12 to 15 of K2
Bonavera, L.; Schlieder, Joshua E.; Howell, Steve B. +15 more
We analysed the photometry of 20 038 cool stars from campaigns 12, 13, 14, and 15 of the K2 mission in order to detect, characterize, and validate new planetary candidates transiting low-mass stars. We present a catalogue of 25 new periodic transit-like signals in 22 stars, of which we computed the parameters of the stellar host for 19 stars and t…
Kinematic study of the association Cyg OB3 with Gaia DR2
Boubert, Douglas; Gandhi, Poshak; Rao, Anjali +3 more
We study the stellar kinematic properties and spatial distribution of the association Cyg OB3 using precise astrometric data from Gaia DR2. All known O- and B-type stars in Cyg OB3 region with positions, parallaxes, and proper motions available are included, comprising a total of 41 stars. The majority of stars are found to be concentrated at a he…
Fifth force induced by a chameleon field on nested cylinders
Bergé, Joel; Pernot-Borràs, Martin; Uzan, Jean-Philippe +1 more
This article investigates the properties of a scalar fifth force that arises in a scalar tensor-theory with a chameleon screening mechanism in the context of gravity space missions like the MICROSCOPE experiment. In such an experiment, the propagation of the chameleon field inside the nested cylinders of the experiment causes a fifth force when th…
Analysis of XMM-Newton Observations of Supernova Remnant W49B and Clues to the Progenitor
Frank, Kari A.; Burrows, David N.; Dwarkadas, Vikram V. +1 more
W49B is a supernova remnant (SNR) discovered over 60 yr ago in early radio surveys. It has since been observed over the entire wavelength range, with the X-ray morphology resembling a centrally filled SNR. The nature of its progenitor star is still debated. Applying Smoothed Particle Inference techniques to analyze the X-Ray emission from W49B, we…
Sustained formation of progenitor globular clusters in a giant elliptical galaxy
Broadhurst, Tom; Ohyama, Youichi; Medezinski, Elinor +2 more
Globular clusters (GCs) are thought to be ancient relics from the early formative phase of galaxies, although their physical origin remains uncertain1,2. GCs are most numerous around massive elliptical galaxies, where they can exhibit a broad colour dispersion, suggesting a wide metallicity spread3. Here, we show that many th…
Differential rotation of the solar corona: A new data-adaptive multiwavelength approach
Giordano, S.; Mancuso, S.; Telloni, D. +1 more
Context. The characterization of the differential rotation of the extended corona is still lacking conclusive results about the actual rotation rate profiles, and it is also expected to vary along the solar cycle. While some studies supported the quasi-rigidity of coronal rotation, others have found evidence of differential rotation to occur.
…
Internal kinematics of giant H II regions in M101 with the Keck Cosmic Web Imager
Bresolin, Fabio; Ho, I. -Ting; Rizzi, Luca +6 more
We study the kinematics of the giant H II regions NGC 5455 and NGC 5471 located in the galaxy M101, using integral field observations that include the H β and [O III] $\, \lambda$ 5007 emission lines, obtained with the Keck Cosmic Web Imager. We analyse the line profiles using both single and multiple Gaussian curves, gathering evidence for the pr…
TOI 564 b and TOI 905 b: Grazing and Fully Transiting Hot Jupiters Discovered by TESS
Trifonov, Trifon; Batalha, Natalie M.; Latham, David W. +54 more
We report the discovery and confirmation of two new hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS): TOI 564 b and TOI 905 b. The transits of these two planets were initially observed by TESS with orbital periods of 1.651 and 3.739 days, respectively. We conducted follow-up observations of each system from the ground, i…
Skymaps of observables of three-dimensional magnetohydrodynamic astrosphere models
Weis, K.; Bomans, D. J.; Fichtner, H. +3 more
Context. Three-dimensional models of astrospheres have recently become of interest. However, comparisons between these models and observations are non-trivial because of the two-dimensional nature of observations.
Aims: By projecting selected physical values of three-dimensional models of astrospheres onto the surface of a sphere that is cent…