Search Publications
Correcting for Interplanetary Scattering in Velocity Dispersion analysis of Solar Energetic Particles
Laitinen, T.; Valtonen, E.; Dalla, S. +1 more
To understand the origin of Solar Energetic Particles (SEPs), we must study their injection time relative to other solar eruption manifestations. Traditionally the injection time is determined using the Velocity Dispersion Analysis (VDA) where a linear fit of the observed event onset times at 1 AU to the inverse velocities of SEPs is used to deriv…
Rheological and petrological implications for a stagnant lid regime on Venus
Ghail, Richard
Venus is physically similar to Earth but with no oceans and a hot dense atmosphere. Its near-random distribution of impact craters led to the inferences of episodic global resurfacing and a stagnant lid regime, and imply that it is not currently able to lose proportionately as much heat as Earth. This paper shows that a CO2-induced asth…
New constraints on the dust surrounding HR 4796A
Pinte, C.; Augereau, J. -C.; Mawet, D. +7 more
Context. HR 4796A is surrounded by a well-structured and very bright circumstellar disc shaped like an annulus with many interesting features: very sharp inner and outer edges, brightness asymmetries, centre offset, and suspected distortions in the ring.
Aims: We aim to constrain the properties of the dust surrounding the star HR 4796A, in pa…
Disorder in the early universe
Green, Daniel
Little is known about the microscopic physics that gave rise to inflation in our universe. There are many reasons to wonder if the underlying description requires a careful arrangement of ingredients or if inflation was the result of an essentially random process. At a technical level, randomness in the microphysics of inflation is closely related…
Mars Express measurements of surface albedo changes over 2004-2010
Altieri, F.; Vincendon, M.; Audouard, J. +1 more
The pervasive Mars dust is continually transported between the surface and the atmosphere. When on the surface, dust increases the albedo of darker underlying rocks and regolith, which modifies climate energy balance and must be quantified. Remote observation of surface albedo absolute value and albedo change is however complicated by dust itself …
Pre-explosion Companion Stars in Type Iax Supernovae
Wang, B.; Liu, Zheng-Wei; Stancliffe, Richard J. +1 more
Type Iax supernovae (SNe Iax) are proposed as one new sub-class of SNe Ia since they present observational properties that are sufficiently distinct from the bulk of SNe Ia. SNe Iax are the most common of all types of peculiar SNe by both number and rate, with an estimated rate of occurrence of about 5%-30% of the total SN Ia rate. However, the pr…
Deep alteration between Hellas and Isidis Basins
Quantin-Nataf, C.; Bultel, B.; Andréani, M. +2 more
Recent investigations of alteration of martian crustal outcrops suggest putative crustal hydrothermal systems, which are favorable environments for the emergence of life. In this study, we perform an analysis of the CRISM targeted observations covering crustal outcrops in the region between the Hellas and Isidis basins with the goal of investigati…
Radio continuum properties of luminous infrared galaxies. Identifying the presence of an AGN in the radio
Murphy, E. J.; Armus, L.; Vardoulaki, E. +7 more
Context. Luminous infrared galaxies (LIRGs) are systems enshrouded in dust, which absorbs most of their optical/UV emission and radiates it again in the mid- and far-infrared. Radio observations are largely unaffected by dust obscuration, enabling us to study the central regions of LIRGs in an unbiased manner.
Aims: The main goal of this proj…
Dark Matter Line Emission Constraints from NuSTAR Observations of the Bullet Cluster
Harrison, F. A.; Hornstrup, A.; Stern, D. +10 more
Some dark matter candidates, e.g., sterile neutrinos, provide observable signatures in the form of mono-energetic line emission. We present the first search for dark matter line emission in the 3-80 {keV} range in a pointed observation of the Bullet Cluster with NuSTAR. We do not detect any significant line emission and instead we derive upper lim…
Optical confirmation and redshift estimation of the Planck cluster candidates overlapping the Pan-STARRS Survey
Price, P. A.; Desai, S.; Chambers, K. C. +16 more
We report results of a study of Planck Sunyaev-Zel'dovich effect selected galaxy cluster candidates using the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS) imaging data. We first examine 150 Planck-confirmed galaxy clusters with spectroscopic redshifts to test our algorithm for identifying optical counterparts and measuring t…