Search Publications
ALMA Observations of the Gravitational Lens SDP.9
Tamura, Yoichi; Oguri, Masamune; Matsushita, Satoki +3 more
We present long-baseline ALMA observations of the strong gravitational lens H-ATLAS J090740.0-004200 (SDP.9), which consists of an elliptical galaxy at {z}{{L}}=0.6129 lensing a background submillimeter galaxy into two extended arcs. The data include Band 6 continuum observations, as well as CO J = 6-5 molecular line observations, from …
Radar sounding of Lucus Planum, Mars, by MARSIS
Rossi, Angelo Pio; Orosei, Roberto; Cartacci, Marco +6 more
Lucus Planum, extending for a radius of approximately 500 km around 181°E, 5°S, is part of the Medusae Fossae Formation (MFF), a set of several discontinuous deposits of fine-grained, friable material straddling across the Martian highland-lowland boundary. The MFF has been variously hypothesized to consist of pyroclastic flows, pyroclastic airfal…
Discovery of a Metal-poor, Luminous Post-AGB Star that Failed the Third Dredge-up.
Wood, P. R.; Asplund, M.; Van Winckel, H. +3 more
Post-asymptotic giant branch (post-AGB) stars are known to be chemically diverse. In this paper we present the first observational evidence of a star that has failed the third dredge-up (TDU). J005252.87-722842.9 is an A-type (T eff = 8250 ± 250 K) luminous (8200 ± 700 L ⊙) metal-poor ([Fe/H] = -1.18 ± 0.10) low-mass (M …
Orbital period changes in RW CrA, DX Vel and V0646 Cen
Chochol, D.; Mašek, M.; Volkov, I. M. +2 more
We aim to determine the absolute parameters of the components of southern Algol-type binaries with deep eclipses RW CrA, DX Vel, V0646 Cen and interpret their orbital period changes. The data analysis is based on a high quality Walraven photoelectric photometry, obtained in the 1960-70s, our recent CCD photometry, ASAS (Pojmanski, 2002), and Hippa…
GRAVITY Spectro-interferometric Study of the Massive Multiple Stellar System HD 93206 A
Henning, Th.; van Boekel, R.; Brandner, W. +9 more
Characterization of the dynamics of massive star systems and the astrophysical properties of the interacting components are a prerequisite for understanding their formation and evolution. Optical interferometry at milliarcsecond resolution is a key observing technique for resolving high-mass multiple compact systems. Here, we report on Very Large …
Major achievements of the Rosetta mission in connection with the origin of the solar system
Barucci, M. A.; Fulchignoni, M.
Comets have been studied from a long time and are believed to preserve pristine materials, so they are fundamental to understand the origin of the solar system and life. Starting in the early 1990s, ESA decided to have a more risky and fantastic mission to a comet. As Planetary Cornerstone mission of the ESA Horizon 2000 program, the Rosetta missi…
2004 TT357: A Potential Contact Binary in the Trans-Neptunian Belt
Noll, Keith S.; Thirouin, Audrey; Sheppard, Scott S.
We report photometric observations of the trans-Neptunian object 2004 TT357 obtained in 2015 and 2017 using the 4.3 m Lowell’s Discovery Channel Telescope. We derive a rotational period of 7.79 ± 0.01 hr and a peak-to-peak lightcurve amplitude of 0.76 ± 0.03 mag. 2004 TT357 displays a large variability that can be explained b…
Response of the Martian ionosphere to solar activity including SEPs and ICMEs in a two-week period starting on 25 February 2015
Gurnett, D. A.; Lundin, R.; Winningham, J. D. +15 more
In a two-week period between February and March of 2015, a series of interplanetary coronal mass ejections (ICMEs) and solar energetic particle (SEP) events encountered Mars. The interactions were observed by several spacecraft, including Mars Express (MEX), Mars Atmosphere and Volatile Evolution Mission (MAVEN), and Mars Odyssey (MO). The ICME di…
Flank vents and graben as indicators of Late Amazonian volcanotectonic activity on Olympus Mons
Christensen, P. R.; Peters, S. I.
Previous studies have focused on large-scale features on Olympus Mons, such as its flank terraces, the summit caldera complex, and the basal escarpment and aureole deposits. Here we identify and characterize previously unrecognized and unmapped small scale features to help further understand the volcanotectonic evolution of this enormous volcano. …
Fourier-space combination of Planck and Herschel images
Henning, Th.; Ballesteros-Paredes, J.; Abreu-Vicente, J. +3 more
Context. Herschel has revolutionized our ability to measure column densities (NH) and temperatures (T) of molecular clouds thanks to its far infrared multiwavelength coverage. However, the lack of a well defined background intensity level in the Herschel data limits the accuracy of the NH and T maps.
Aims: We aim to prov…