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Multiple stellar populations in NGC 1866. New clues from Cepheids and colour-magnitude diagram
Girardi, Léo; Marigo, Paola; Goudfrooij, Paul +5 more
We performed a comprehensive study of the stellar populations in the young Large Magellanic Cloud cluster NGC 1866, combining the analysis of its best-studied Cepheids with that of a very accurate colour-magnitude diagram (CMD) obtained from the most recent Hubble Space Telescope photometry. We used a Bayesian method based on new PARSEC stellar ev…
Extreme Debris Disk Variability: Exploring the Diverse Outcomes of Large Asteroid Impacts During the Era of Terrestrial Planet Formation
Reichart, D. E.; Rujopakarn, W.; Dong, Ruobing +14 more
The most dramatic phases of terrestrial planet formation are thought to be oligarchic and chaotic growth, on timescales of up to 100-200 Myr, when violent impacts occur between large planetesimals of sizes up to protoplanets. Such events are marked by the production of large amounts of debris, as has been observed in some exceptionally bright and …
Speckle Interferometry at SOAR in 2018
Tokovinin, Andrei; Briceño, Cesar; Horch, Elliott P. +2 more
The results of speckle interferometric observations at the 4.1 m Southern Astrophysical Research Telescope (SOAR) in 2018 are given, totaling 3097 measurements of 2427 resolved pairs with separations from 11 mas to 5.″9 (median 0.″15, magnitude difference up to 7 mag) and nonresolutions of 624 targets. This work continues our long-term speckle pro…
A LOFAR-IRAS cross-match study: the far-infrared radio correlation and the 150 MHz luminosity as a star-formation rate tracer
Prandoni, I.; Wang, L.; Shimwell, T. W. +15 more
Aims: We aim to study the far-infrared radio correlation (FIRC) at 150 MHz in the local Universe (at a median redshift ⟨z⟩∼0.05) and improve the use of the rest-frame 150 MHz luminosity, L150, as a star-formation rate (SFR) tracer, which is unaffected by dust extinction.
Methods: We cross-match the 60 µm selected Revised…
Empirical Modeling of CME Evolution Constrained to ACE/SWICS Charge State Distributions
Landi, Enrico; Rivera, Yeimy J.; Lepri, Susan T. +1 more
It is generally accepted that coronal mass ejections (CMEs) undergo rapid heating as they are released from the Sun. However, to date, the heating mechanism remains an open question. To gain insight into the plasma heating, we derive the density, temperature, and velocity evolution of the 2005 January 9 interplanetary CME event from launch to ion …
WISE J072003.20-084651.2B is a Massive T Dwarf
Shappee, B. J.; Dupuy, Trent J.; Mann, Andrew W. +21 more
We present individual dynamical masses for the nearby M9.5+T5.5 binary WISE J072003.20-084651.2AB, a.k.a. Scholz’s star. Combining high-precision Canada-France-Hawaii Telescope/WIRCam photocenter astrometry and Keck adaptive optics resolved imaging, we measure the first high-quality parallactic distance ({6.80}-0.06+0.05 pc) …
Close-up view of an ongoing merger between the NGC 4839 group and the Coma cluster - a post-merger scenario
Churazov, E.; Forman, W.; Jones, C. +5 more
We study a merger of the NGC 4839 group with the Coma cluster using X-ray observations from the XMM-Newton and Chandra telescopes. X-ray data show two prominent features: (i) a long (∼600 kpc in projection) and bent tail of cool gas trailing (towards south-west) the optical centre of NGC 4839, and (ii) a `sheath' region of enhanced X-ray surface b…
The CORALIE survey for southern extrasolar planets. XVIII. Three new massive planets and two low-mass brown dwarfs at greater than 5 AU separation
Bouchy, F.; Queloz, D.; Ségransan, D. +36 more
Context. Since 1998, a planet-search around main sequence stars within 50 pc in the southern hemisphere has been underway with the CORALIE spectrograph at La Silla Observatory.
Aims: With an observing time span of more than 20 yr, the CORALIE survey is able to detect long-term trends in data with masses and separations large enough to select …
On the Oosterhoff dichotomy in the Galactic bulge: I. Spatial distribution
Smolec, R.; Grebel, E. K.; Catelan, M. +3 more
We present a study of the Oosterhoff (Oo) dichotomy in the Galactic bulge using 8141 fundamental-mode RR Lyrae stars. We used public photometric data from the Optical Gravitational Lensing Experiment and the Vista Variables in the Vía Láctea survey. We carefully selected fundamental-mode stars without modulation and without association with any gl…
The Interface between the Outer Heliosphere and the Inner Local ISM: Morphology of the Local Interstellar Cloud, Its Hydrogen Hole, Strömgren Shells, and 60Fe Accretion
Redfield, Seth; Linsky, Jeffrey L.; Tilipman, Dennis
We describe the interface between the outer heliosphere and the local interstellar medium (LISM) surrounding the Sun. The components of the inner LISM are the four partially ionized clouds (the Local Interstellar Cloud (LIC), G cloud, Blue cloud, and Aql cloud) that are in contact with the outer heliosphere, and ionized gas produced by EUV radiati…