Search Publications
Herschel/PACS photometry of transiting-planet host stars with candidate warm debris disks
Ardila, David R.; Bouy, Hervé; Stapelfeldt, Karl +4 more
Dust in debris disks is produced by colliding or evaporating planetesimals, which are remnants of the planet formation process. Warm dust disks, known by their emission at ≤24 µm, are rare (4% of FGK main sequence stars) and especially interesting because they trace material in the region likely to host terrestrial planets, where the dust ha…
Stereoscopic observations of the effects of a halo CME on the solar coronal structure
Romano, P.; Spadaro, D.; Dolei, S. +1 more
We investigated the substantial restructuring of the outer solar corona in the aftermath of the halo CME that occurred on 9 March 2012. To perform our analysis, we used SOHO/LASCO, STEREO/COR1 and SDO/AIA data, which provide observations from different viewpoints. In particular, we applied the polarization ratio technique to the COR1 calibrated im…
XMM-Newton and Chandra X-ray follow-up observations of the VHE gamma-ray source HESS J1507-622
Tibolla, O.; Kaufmann, S.; Kosack, K.
Context. The discovery of the unique source HESS J1507-622 in the very high energy (VHE) range (100 GeV-100 TeV) opened new possibilities to study the parent population of ultra-relativistic particles found in astrophysical sources and underlined the possibility of new scenarios/mechanisms crucial for understanding the underlying astrophysical pro…
Resolving the shocked gas in HH 54 with Herschel. CO line mapping at high spatial and spectral resolution
Olofsson, G.; Liseau, R.; Benedettini, M. +11 more
Context. The HH 54 shock is a Herbig-Haro object, located in the nearby Chamaeleon II cloud. Observed CO line profiles are due to a complex distribution in density, temperature, velocity, and geometry.
Aims: Resolving the HH 54 shock wave in the far-infrared (FIR) cooling lines of CO constrain the kinematics, morphology, and physical conditio…
Activity-related variations of high-degree p-mode amplitude, width, and energy in solar active regions
Chae, J.; Maurya, R. A.; Ambastha, A.
Context. Solar energetic transients such as flares and coronal mass ejections occur mostly within active regions (ARs) and release large amounts of energy, which is expected to excite acoustic waves by transferring the mechanical impulse of the thermal expansion of the flare on the photosphere. On the other hand, strong magnetic fields of AR sunsp…
Stereoscopic investigation on plasma density fluctuations in the outer solar corona
Romano, P.; Antonucci, E.; Spadaro, D. +3 more
This research note extends a previous work focused on the 2D reconstruction of the spatial distribution and temporal evolution of the plasma density fluctuations in the outer solar corona and based on STEREO COR1-A white-light observations. By using the corresponding total brightness images obtained in the same observational period with the corona…
Herschel-Planck dust optical-depth and column-density maps (Corrigendum). I. Method description and results for Orion
Alves, João; Bouy, Hervé; Lada, Charles J. +1 more
Response to "Stray-light correction in 2D spectroscopy" by R. Schlichenmaier and M. Franz
Scharmer, G. B.
We discuss a recent paper by Schlichenmaier & Franz (SF; 2013, A&A, 555, A84), in which the claim is made that the penumbral dark downflows detected for the first time with the Swedish 1-m Solar Telescope (SST) by Scharmer et al. and Joshi et al. could be produced by overcompensation for straylight. We show that the analysis of SF is funda…
Analysing weak orbital signals in Gaia data
Lucy, L. B.
Anomalous orbits are found when minimum-χ2 estimation is applied to synthetic Gaia data for orbits with astrometric signatures comparable to the single-scan measurement error (Pourbaix 2002, A&A, 385, 686). These orbits are nearly parabolic, edge-on, and their major axes align with the line-of-sight to the observer. Such orbits viol…
Star forming regions linked to RCW 78 and the discovery of a new IR bubble
Rubio, M.; Firpo, V.; Cappa, C. E. +2 more
Aims: With the aim of investigating the presence of molecular and dust clumps linked to two star forming regions identified in the expanding molecular envelope of the stellar wind bubble RCW 78, we analyzed the distribution of the molecular gas and cold dust.
Methods: To accomplish this study we performed dust continuum observations at 8…