Search Publications
A Two Martian Years Survey of Water Ice Clouds on Mars With ACS Onboard TGO
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +7 more
The middle infrared (MIR) channel of the atmospheric chemistry suite (ACS) instrument onboard the ExoMars Trace Gas Orbiter ESA-Roscosmos mission has performed Solar occultation measurements of the Martian atmosphere in the 2.3-4.2 µm spectral range since March 2018, which now covers two Martian years (MY). We use the methodology previously …
Long-period Ap stars discovered with TESS data: The northern ecliptic hemisphere
Kurtz, D. W.; Mathys, G.; Holdsworth, D. L.
The rotation periods of the magnetic Ap stars span five to six orders of magnitude. While it is well established that period differentiation must have taken place at the pre-main sequence stage, the physical processes that lead to it remain elusive. The existence of Ap stars that have rotation periods of tens to hundreds of years is particularly i…
Cosmic Coincidences of Primordial-Black-Hole Dark Matter
Silk, Joseph; Wu, Yi-Peng; Pinetti, Elena
If primordial black holes (PBHs) contribute more than 10% of the dark matter (DM) density, their energy density today is of the same order as that of the baryons. Such a cosmic coincidence might hint at a mutual origin for the formation scenario of PBHs and the baryon asymmetry of the Universe. Baryogenesis can be triggered by a sharp transition o…
Migratory Outbursting Quasi-Hilda Object 282P/(323137) 2003 BM80
Chandler, Colin Orion; Trujillo, Chadwick A.; Oldroyd, William J.
We report that object 282P/(323137) 2003 BM80 is undergoing a sustained activity outburst, lasting over 15 months thus far. These findings stem in part from our NASA Partner Citizen Science project Active Asteroids (http://activeasteroids.net), which we introduce here. We acquired new observations of 282P via our observing campaign (Vat…
A large range of haziness conditions in hot-Jupiter atmospheres
Lavvas, Panayotis; Arfaux, Anthony
We present a study of photochemical hazes of exoplanet atmospheres based on a self-consistent model including haze microphysics, disequilibrium chemistry, and radiative feedbacks. We derive the haze properties required to match Hubble Space Telescope observations of 10 hot-Jupiters. HAT-P-12b, HD-189733b, HD-209458b, and WASP-6b require haze mass …
High-resolution, High-sensitivity, Low-frequency uGMRT View of Coma Cluster of Galaxies
Brunetti, G.; Venturi, T.; Churazov, E. M. +12 more
We present high-resolution, high-sensitivity upgraded Giant Metrewave Radio Telescope observations of the Coma cluster (A1656) at 250-500 MHz and 550-850 MHz. At 250-500 MHz, 135 sources have extensions >0.'45 (with peak-to-local-noise ratio >4). Of these, 24 sources are associated with Coma-member galaxies. In addition, we supplement this s…
Evidence in favour of density wave theory through age gradients observed in star formation history maps and spatially resolved stellar clusters
Davis, Benjamin L.; Eufrasio, Rafael; Monson, Erik B. +7 more
Quasi-stationary density wave theory predicts the existence of an age gradient across the spiral arms with a phase crossing at the corotation radius. We have examined evidence for such age gradients using star formation history (SFH) maps derived from LIGHTNING, a spectral energy distribution fitting procedure, and by using spatially resolved stel…
Asteroid Photometric Phase Functions From Bayesian Lightcurve Inversion
Muinonen, Karri; Cellino, Alberto; Wang, Xiaobin +3 more
Photometry is an important tool for characterizing the physical properties of asteroids. An asteroid's photometric lightcurve and phase curve refer to the variation of the asteroid's disk-integrated brightness in time and in phase angle (the Sun-asteroid-observer angle), respectively. They depend on the asteroid's shape, rotation, and surface scat…
Eruptions from coronal bright points: A spectroscopic view by IRIS of a mini-filament eruption, QSL reconnection, and reconnection-driven outflows
Madjarska, Maria S.; Wiegelmann, Thomas; Mackay, Duncan H. +2 more
Context. Our study investigates a mini-filament eruption associated with cancelling magnetic fluxes. The eruption originates from a small-scale loop complex commonly known as a coronal bright point (CBP). The event is uniquely recorded in both the imaging and spectroscopic data taken with the Interface Region Imaging Spectrograph (IRIS).
Aims…
A super-Earth orbiting near the inner edge of the habitable zone around the M4.5 dwarf Ross 508
Henning, Thomas; Nakagawa, Takao; Currie, Thayne +46 more
We report the near-infrared radial velocity (RV) discovery of a super-Earth planet on a 10.77 d orbit around the M4.5 dwarf Ross 508 (Jmag = 9.1). Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive a semi-amplitude of $3.92^{+0.60}_{-0.58}\:\mbox{m}\:{\mbox{s}^{-1}}$, corresponding to a planet wit…