Search Publications
Identification of new transitional disk candidates in Lupus with Herschel
Prusti, T.; Pilbratt, G. L.; Bouy, H. +4 more
Context. New data from the Herschel Space Observatory are broadening our understanding of the physics and evolution of the outer regions of protoplanetary disks in star-forming regions. In particular they prove to be useful for identifying transitional disk candidates.
Aims: The goals of this work are to complement the detections of disks and…
Proper Motion of the Draco Dwarf Galaxy Based On Hubble Space Telescope Imaging
Piatek, Slawomir; Pryor, Carlton; Olszewski, Edward W.
We have measured the proper motion of the Draco dwarf galaxy using images at two epochs with a time baseline of about two years taken with the Hubble Space Telescope Advanced Camera for Surveys. Wide Field Channels 1 and 2 provide two adjacent fields, each containing a known QSO. The zero point for the proper motion is determined using both backgr…
Properties of Polycyclic Aromatic Hydrocarbons in the Northwest Photon Dominated Region of NGC 7023. III. Quantifying the Traditional Proxy for PAH Charge and Assessing its Role
Boersma, C.; Allamandola, L. J.; Bregman, J.
Polycyclic aromatic hydrocarbon (PAH) emission in the Spitzer/IRS spectral map of the northwest photon dominated region (PDR) in NGC 7023 is analyzed. Here, results from fitting the 5.2-14.5 µm spectrum at each pixel using exclusively PAH spectra from the NASA Ames PAH IR Spectroscopic Database (www.astrochem.org/pahdb/) and observed PAH ban…
Searching for primordial localized features with CMB and LSS spectra
Hu, Bin; Torrado, Jesús
Inspired by the study of mild transient reductions in the speed of sound of the adiabatic mode during inflation, we search for a primordial localized feature imprinted in cosmic microwave background and large-scale structure formation observables. We find some common oscillatory patterns both in the Planck CMB temperature-temperature power spectru…
COSIMA calibration for the detection and characterization of the cometary solid organic matter
Briois, Christelle; Cottin, Hervé; Fray, Nicolas +4 more
On the orbiter of the Rosetta spacecraft, the Cometary Secondary Ion Mass Analyser (COSIMA) will provide new in situ insights about the chemical composition of cometary grains all along 67P/Churyumov-Gerasimenko (67P/CG) journey until the end of December 2015 nominally. The aim of this paper is to present the pre-calibration which has already been…
Coronal Pseudo-Streamer and Bipolar Streamer Observed by SOHO/UVCS in March 2008
Riley, P.; Abbo, L.; Wang, Y. -M. +1 more
The past solar minimum is characterized by several peculiar aspects and by a complex magnetic topology with two different types of coronal streamers: pseudo-streamers and bipolar streamers. Pseudo-streamers or unipolar streamer are coronal structures that separate coronal holes of the same polarity, without a current sheet in the outer corona; unl…
The shape of the Venusian bow shock at solar minimum and maximum: Revisit based on VEX observations
Zhang, Tielong; Wang, Shui; Huang, Can +5 more
Several factors control the bow shock position at Venus, including short-term period responses (solar wind dynamic pressure) and long-term period variations (solar activity). Based on Venus Express (VEX) observations, we revisit the influence of solar activity on the Venusian bow shock location, by accurately determining not only the shock termina…
The Arches Cluster: Extended Structure and Tidal Radius
Hosek, Matthew W., Jr.; Lu, Jessica R.; Clarkson, William I. +3 more
At a projected distance of ∼26 pc from Sgr A*, the Arches cluster provides insight into star formation in the extreme Galactic center (GC) environment. Despite its importance, many key properties, such as the cluster’s internal structure and orbital history, are not well known. We present an astrometric and photometric study of the outer region of…
Slow electron holes in multicomponent plasmas
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +2 more
Electrostatic solitary waves (ESWs), often interpreted as electron phase space holes, are commonly observed in plasmas and are manifestations of strongly nonlinear processes. Often slow ESWs are observed, suggesting generation by the Buneman instability. The instability criteria, however, are generally not satisfied. We show how slow electron hole…
O2 Emission toward Orion H2 Peak 1 and the Role of FUV-illuminated C-shocks
Kaufman, Michael J.; Melnick, Gary J.
Molecular oxygen (O2) has been the target of ground-based and space-borne searches for decades. Of the thousands of lines of sight surveyed, only those toward Rho Ophiuchus and Orion H2 Peak 1 have yielded detections of any statistical significance. The detection of the O2 NJ = 33-12