Search Publications
Strongly Lensed Supernova Refsdal: Refining Time Delays Based on the Supernova Explosion Models
Nomoto, Ken'ichi; Blinnikov, Sergei; Baklanov, Petr +1 more
We explore the properties of supernova (SN) "Refsdal"—the first discovered gravitationally lensed SN with multiple images. A large magnification provided by the galactic-scale lens, augmented by the cluster lens, gave us a unique opportunity to perform a detailed modeling of a distant SN at $z\simeq 1.5$ . We present results of radiation hydrodyna…
Ammonia-methane ratios from H-band near-infrared spectra of late-T and Y dwarfs
Martín, E. L.; Burgasser, A. J.; Masseron, T. +4 more
Aims: Our goals are to investigate the relative absorption strengths of ammonia and methane using low-resolution H-band (1.5−1.7 microns) spectra obtained in the laboratory and compared with observational spectra of late-T and Y dwarfs, and to estimate what can be expected from the wide-angle low-resolution near-infrared spectroscopic survey …
The VLT-MUSE and ALMA view of the MACS 1931.8-2635 brightest cluster galaxy
Ziegler, B. L.; Postman, M.; Donahue, M. +4 more
We reveal the importance of ongoing in situ star formation in the brightest cluster galaxy (BCG) in the massive cool-core CLASH cluster MACS 1931.8-2635 at a redshift of z = 0.35 by analysing archival VLT-MUSE optical integral field spectroscopy. Using a multi-wavelength approach, we assessed the stellar and warm ionised medium components, which w…
Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon
Magdis, G. E.; Rigopoulou, D.; Huang, J. -S. +5 more
We present the results of an integral field spectroscopy survey of a sample of dusty (ultra) luminous infrared galaxies (U/LIRGs) at 2 < z < 2.5 using KMOS on the Very Large Telescope. The sample has been drawn from Herschel deep field surveys and benefits from ancillary multiwavelength data. Our goal is to investigate the physical character…
A VLBA Survey of Radio Stars in the Orion Nebula Cluster. II. Astrometry
Menten, Karl M.; Forbrich, Jan; Reid, Mark J. +1 more
From Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion Nebula Cluster (ONC). We find optical sources in the Gaia DR2 catalog for 34 of them within 0"2 of the radio positions. Most of the radio sources are likely companions of G…
The Mercury Gamma-Ray and Neutron Spectrometer (MGNS) Onboard the Mercury Planetary Orbiter of the BepiColombo Mission: Design Updates and First Measurements in Space
Schulz, R.; Mitrofanov, I. G.; Kozyrev, A. S. +7 more
An updated set of goals and objectives for the Mercury Gamma and Neutron Spectrometer (MGNS) are presented based on the most recent findings of the MESSENGER mission. The updated design of MGNS with the new CeBr3 crystal for detection of gamma-ray along with its benefits for the detection of 40K and K/Th ratio are discussed. …
Are Disks of Satellites Comprised of Tidal Dwarf Galaxies?
Famaey, Benoit; Kroupa, Pavel; Thies, Ingo +1 more
It was found that satellites of nearby galaxies can form flattened co-rotating structures called disks of satellites or planes of satellites. Their existence is not expected by the current galaxy formation simulations in the standard dark matter-based cosmology. On the contrary, modified gravity offers a promising alternative: the objects in the d…
The GALAH Survey: No Chemical Evidence of an Extragalactic Origin for the Nyx Stream
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +20 more
The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion events that built up the Milky Way and its halo. One of these newly identified features, called Nyx,…
Discovery, TESS Characterization, and Modeling of Pulsations in the Extremely Low-mass White Dwarf GD 278
Córsico, Alejandro H.; Hermes, J. J.; Bell, Keaton J. +5 more
We report the discovery of pulsations in the extremely low-mass (ELM), likely helium-core white dwarf GD 278 via ground- and space-based photometry. GD 278 was observed by the Transiting Exoplanet Survey Satellite (TESS) in Sector 18 at a 2 minute cadence for roughly 24 days. The TESS data reveal at least 19 significant periodicities between 2447 …
Precipitation Driven Pedogenic Weathering of Volcaniclastics on Early Mars
Michalski, J. R.; Ye, B.
Compositional stratigraphy, generally composed of Al rich clay minerals overlying Fe/Mg rich clay minerals, is observed in many locations on Mars. Here we describe the occurrence of such mineralogical stratigraphy in settings where the protoliths are almost certainly pyroclastic materials. One such example includes altered rocks high on the summit…