Search Publications
Discovery of a new nearby globular cluster with extreme kinematics located in the extension of a halo stream
Smith, Leigh C.; Minniti, Dante; Fernández-Trincado, José G. +3 more
Context. We report the discovery of VVV-CL160, a new nearby globular cluster (GC) with extreme kinematics, located in the Galactic plane at l = 10.1477 deg, b = 0.2999 deg.
Aims: We aim to characterize the physical properties of this new GC and place it in the context of the Milky Way, exploring its possible connection with the known GC NGC 6…
Analysis of galaxy kinematics based on Cepheids from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.; Rastorguev, A. S. +1 more
To construct the rotation curve of the Galaxy, classical Cepheids with proper motions, parallaxes and line-of-sight velocities from the Gaia DR2 Catalogue are used in large part. Our working sample formed from literature data contains about 800 Cepheids with estimates of their age. We determined that the linear rotation velocity of the Galaxy at t…
MONOS: Multiplicity Of Northern O-type Spectroscopic systems. II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
Simón-Díaz, S.; Maíz Apellániz, J.; Negueruela, I. +3 more
Context. Massive stars are a key element for understanding the chemical and dynamical evolution of galaxies. Stellar evolution is conditioned by many factors: Rotation, mass loss, and interaction with other objects are the most important ones for massive stars. During the first evolutionary stages of stars with initial masses (i.e., MZAMS
The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b
Deming, Drake; Madhusudhan, Nikku; Nikolov, Nikolay +14 more
We present a comprehensive analysis of the 0.3-5 µm transit spectrum for the inflated hot Jupiter HAT-P-41b. The planet was observed in transit with Hubble STIS and WFC3 as part of the Hubble Panchromatic Comparative Exoplanet Treasury (PanCET) program, and we combine those data with warm Spitzer transit observations. We extract transit dept…
Recurrent Activity from Active Asteroid (248370) 2005 QN173: A Main-belt Comet
Chandler, Colin Orion; Trujillo, Chadwick A.; Hsieh, Henry H.
We present archival observations of main-belt asteroid (248370) 2005 QN173 (also designated 433P) that demonstrate this recently discovered active asteroid (a body with a dynamically asteroidal orbit displaying a tail or coma) has had at least one additional apparition of activity near perihelion during a prior orbit. We discovered evid…
Revisiting Attenuation Curves: The Case of NGC 3351
Grebel, Eva K.; Östlin, Göran; Smith, Linda J. +14 more
Multiwavelength images from the far-UV (∼0.15 µm) to the submillimeter of the central region of the galaxy NGC 3351 are analyzed to constrain its stellar populations and dust attenuation. Despite hosting a ∼1 kpc circumnuclear starburst ring, NGC 3351 deviates from the IRX-β relation, the relation between the infrared-to-UV luminosity ratio …
An Observational Study of a "Rosetta Stone" Solar Eruption
Mason, E. I.; Antiochos, Spiro K.; Vourlidas, Angelos
This Letter reports observations of an event that connects all major classes of solar eruptions: those that erupt fully into the heliosphere versus those that fail and are confined to the Sun, and those that eject new flux into the heliosphere, in the form of a flux rope, versus those that eject only new plasma in the form of a jet. The event orig…
Variable stars in Local Group galaxies - V. The fast and early evolution of the low-mass Eridanus II dSph galaxy
Zenteno, A.; Walker, A. R.; Salvadori, S. +18 more
We present a detailed study of the variable star population of Eridanus II (Eri II), an ultra-faint dwarf galaxy that lies close to the Milky Way virial radius. We analyse multi-epoch g, r, i ground-based data from Goodman and the Dark Energy Camera, plus F475W, F606W, F814W space data from the Advanced Camera for Surveys. We report the detection …
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy - I. HH 529 II and III
Henney, W. J.; Méndez-Delgado, J. E.; Arellano-Córdova, K. Z. +3 more
We present the analysis of physical conditions, chemical composition, and kinematic properties of two bow shocks - HH 529 II and HH 529 III - of the fully photoionized Herbig-Haro object HH 529 in the Orion Nebula. The data were obtained with the Ultraviolet and Visual Echelle Spectrograph at the 8.2m Very Large Telescope and 20 yr of Hubble Space…
Periodic Bedrock Ridges at the ExoMars 2022 Landing Site: Evidence for a Changing Wind Regime
Pajola, M.; Tirsch, D.; Silvestro, S. +11 more
Wind formed features are abundant in Oxia Planum (Mars), the landing site of the 2022 ExoMars mission, which shows geological evidence for a past wet environment. Studies of aeolian bedforms at the landing site were focused on assessing the risk for rover trafficability, however their potential in recording climatic fluctuations has not been explo…