Search Publications
Testing dark energy models with a new sample of strong-lensing systems
Motta, V.; Amante, Mario H.; García-Aspeitia, Miguel A. +2 more
Inspired by a new compilation of strong-lensing systems, which consist of 204 points in the redshift range 0.0625 < zl < 0.958 for the lens and 0.196 < zs < 3.595 for the source, we constrain three models that generate a late cosmic acceleration: the ω-cold dark matter model, the Chevallier-Polarski-Linder, and th…
Photometry and performance of SPECULOOS-South
Queloz, D.; Delrez, L.; Gillon, M. +16 more
SPECULOOS-South, an observatory composed of four independent 1-m robotic telescopes, located at ESO Paranal, Chile, started scientific operation in 2019 January. This Southern hemisphere facility operates as part of the Search for Habitable Planets EClipsing ULtra-cOOl Stars (SPECULOOS), an international network of 1-m-class telescopes surveying f…
Magnetic field turbulence in the solar wind at sub-ion scales: in situ observations and numerical simulations
Hellinger, P.; Alexandrova, O.; Matteini, L. +5 more
We investigate the transition of the solar wind turbulent cascade from MHD to sub-ion range by means of a detail comparison between in situ observations and hybrid numerical simulations. In particular we focus on the properties of the magnetic field and its component anisotropy in Cluster measurements and hybrid 2D simulations. First, we address t…
The Luminosity Function of Red Supergiants in M31
Drout, Maria R.; Massey, Philip; Levesque, Emily M. +5 more
The mass-loss rates of red supergiant stars (RSGs) are poorly constrained by direct measurements, and yet the subsequent evolution of these stars depends critically on how much mass is lost during the RSG phase. In 2012 the Geneva evolutionary group updated their mass-loss prescription for RSGs with the result that a 20 M⊙ star now lose…
X-ray properties of z ≳ 6.5 quasars
Banerji, M.; McMahon, R. G.; Pons, E. +1 more
We present XMM-Newton X-ray observations and analysis of three Dark Energy Survey z > 6.5 quasars (VDES J0020-3653 at z = 6.824, VDES J0244-5008 at z = 6.724, and VDES J0224-4711 at z = 6.526) and six other quasars with 6.438 < z < 6.747 from the XMM-Newton public archive. Two of the nine quasars are detected at a high (>4σ) significan…
Search for Nearby Earth Analogs. II. Detection of Five New Planets, Eight Planet Candidates, and Confirmation of Three Planets around Nine Nearby M Dwarfs
Butler, R. Paul; Crane, Jeffrey D.; Thompson, Ian B. +9 more
Zechmeister et al. surveyed 38 nearby M dwarfs from 2000 to 2007 March with VLT2 and the Ultraviolet and Visual Echelle Spectrograph (UVES) spectrometer. These data have recently been reanalyzed, yielding a significant improvement in the Doppler velocity precision. Spurred by this, we have combined the UVES data with velocity sets from High Accura…
An obscured AGN population hidden in the VIPERS galaxies: identification through spectral energy distribution decomposition
Georgantopoulos, I.; Mountrichas, G.; Bonanos, A. Z. +3 more
The detection of X-ray emission constitutes a reliable and efficient tool for the selection of active galactic nuclei (AGNs), although it may be biased against the most heavily absorbed AGNs. Simple mid-infrared (IR) broad-band selection criteria identify a large number of luminous and absorbed AGNs, yet again host contamination could lead to non-…
An Unusual Transmission Spectrum for the Sub-Saturn KELT-11b Suggestive of a Subsolar Water Abundance
Madhusudhan, Nikku; Barclay, Thomas; Fortney, Jonathan J. +30 more
We present an optical-to-infrared transmission spectrum of the inflated sub-Saturn KELT-11b measured with the Transiting Exoplanet Survey Satellite (TESS), the Hubble Space Telescope (HST) Wide Field Camera 3 G141 spectroscopic grism, and the Spitzer Space Telescope (Spitzer) at 3.6 µm, in addition to a Spitzer 4.5 µm secondary eclipse…
Narrowband Large Amplitude Whistler-mode Waves in the Solar Wind and Their Association with Electrons: STEREO Waveform Capture Observations
Breneman, A. W.; Cattell, C. A.; Short, B. +1 more
Large amplitude (up to 70 mV m-1) whistler-mode waves at frequencies of ∼0.2-0.4 fce (electron cyclotron frequency) are frequently observed in the solar wind. The waves are obliquely propagating at angles close to the resonance cone, resulting in significant electric fields parallel to the background magnetic field, enabling …
Supernovae in Orion: The Missing Link in the Star-forming History of the Region
Kounkel, Marina
The Orion Complex is a notable star-forming region fragmented into several different populations with substantial differences in their phase space. I propose a model that attempts to explain the how the Complex has evolved into this current configuration. In the model presented here, the large-scale expansion can be attributable to a supernova tha…