Search Publications
Mapping water in protostellar outflows with Herschel. PACS and HIFI observations of L1448-C
Liseau, R.; Codella, C.; Benedettini, M. +13 more
Context. Water is a key probe of shocks and outflows from young stars because it is extremely sensitive to both the physical conditions associated with the interaction of supersonic outflows with the ambient medium and the chemical processes at play.
Aims: Our goal is to investigate the spatial and velocity distribution of H2O alon…
Combined IRAM and Herschel/HIFI study of cyano(di)acetylene in Orion KL: tentative detection of DC3N
Cernicharo, José; Viti, Serena; Palau, Aina +8 more
Context. We present a study of cyanoacetylene (HC3N) and cyanodiacetylene (HC5N) in Orion KL using observations from two line surveys performed with the IRAM 30-m telescope and the HIFI instrument onboard the Herschel telescope. The frequency ranges covered are 80-280 GHz and 480-1906 GHz.
Aims: This study (divided by fa…
Impact flux on Jupiter: From superbolides to large-scale collisions
Hueso, R.; Sánchez-Lavega, A.; Delcroix, M. +21 more
Context. Regular observations of Jupiter by a large number of amateur astronomers have resulted in the serendipitous discovery of short bright flashes in its atmosphere, which have been proposed as being caused by impacts of small objects. Three flashes were detected: one on June 3, 2010, one on August 20, 2010, and one on September 10, 2012.
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Improving the performance of solar flare prediction using active longitudes information
Huang, X.; Zhang, L.; Wang, H. +1 more
Context. Solar flare prediction models normally depend on properties of active regions, such as sunspot area, McIntosh classifications, Mount Wilson classifications, and various measures of the magnetic field. Nevertheless, the positional information of active regions has not been used.
Aims: We define a metric, DARAL (distance bet…
The velocity field of sunspot penumbrae. II. Return flow and magnetic fields of opposite polarity
Franz, M.; Schlichenmaier, R.
Aims: We search for penumbral magnetic fields of opposite polarity and for their correspondence with downflows.
Methods: We used spectropolarimetric HINODE data of a spot very close to disk center to suppress the horizontal velocity components as much as possible. We focus our study on 3-lobe Stokes V profiles.
Results: From forward…
Spin and activity of comet 67P/Churyumov-Gerasimenko
Lara, L. M.; Sierks, H.; Vincent, J. -B. +2 more
Aims: In 2014 ESA's spacecraft Rosetta will reach its final target: comet 67P/Churyumov-Gerasimenko (67P). Although this comet has been studied in great detail over the past decade, there are still some uncertainties regarding the actual spin orientation and the distribution of active regions on the surface. We here give an overview of our cu…
The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies
Maraschi, L.; Covino, S.; Antonelli, L. A. +193 more
Context. BL Lacertae objects are variable at all energy bands on time scales down to minutes. To construct and interpret their spectral energy distribution (SED), simultaneous broad-band observations are mandatory. Up to now, the number of objects studied during such campaigns is very limited and biased towards high flux states.
Aims: We pres…
Heavy water stratification in a low-mass protostar
Ceccarelli, C.; Caux, E.; Vastel, C. +6 more
Context. Despite the low elemental deuterium abundance in the Galaxy, enhanced molecular deuterium fractionation has been found in the environments of low-mass star-forming regions and, in particular, the Class 0 protostar IRAS 16293-2422.
Aims: The key program Chemical HErschel Surveys of Star forming regions (CHESS) aims at studying the mol…
Vertical flows and mass flux balance of sunspot umbral dots
Solanki, S. K.; van Noort, M.; Riethmüller, T. L. +1 more
A new Stokes inversion technique that greatly reduces the effect of the spatial point spread function of the telescope is used to constrain the physical properties of umbral dots (UDs). The depth-dependent inversion of the Stokes parameters from a sunspot umbra recorded with Hinode SOT/SP revealed significant temperature enhancements and magnetic …
A Herschel PACS survey of the dust and gas in Upper Scorpius disks
Duchêne, Gaspard; Ménard, François; Pinte, Christophe +2 more
We present results of far-infrared photometric observations with Herschel PACS of a sample of Upper Scorpius stars, with a detection rate of previously known disk-bearing K and M stars at 70, 100, and 160 µm of 71%, 56%, and 50%, respectively. We fit power-law disk models to the spectral energy distributions of K & M stars with infrared …