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Novel methods to measure the gravitational constant in space
Mendes, L.; Russano, G.; Nofrarias, M. +76 more
We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a displaced source mass. Experiment 2 measures a change in relative acceleration between two test masses due to a s…
Dust evolution in the circumstellar disc of the unclassified B[e] star HD 50138
Ábrahám, P.; Chen, L.; Varga, J. +3 more
We studied the disc of the unclassified B[e] star HD 50138 in order to explore its structure and to find indications for the evolutionary status of this system, whether it is a young Herbig Be or a post-main-sequence star. Using high spatial resolution interferometric measurements from MIDI instrument (N-band) on the Very Large Telescope Interfero…
Acoustic oscillations and dynamo action in the G8 sub-giant EK Eridani
Pallé, P. L.; Stello, D.; Corsaro, E. +3 more
We present further evidence of acoustic oscillations in the slowly rotating overactive G8 sub-giant EK Eri. This star was observed with the 1m Hertzsprung SONG telescope at the Observatorio del Teide for two different runs of 8 and 13 nights, respectively, that were separated by about a year. We determined a significant excess of power around ν
Retrieval and characterization of carbon monoxide (CO) vertical profiles in the Martian atmosphere from observations of PFS/MEX
Vandaele, Ann Carine; Aoki, Shohei; Daerden, Frank +7 more
The knowledge of the carbon monoxide (CO) abundance on Mars is essential in order to assess the processes driving the carbon cycle on the planet. Solar occultation measurements provide vertically-resolved measurements of CO from a few kilometers to higher altitudes and can be complemented by nadir measurements to enhance the spatial coverage of ob…
A Mini Survey of Methyl Cyanide toward Extended Green Objects
Liu, Sheng-Yuan; Chen, Huei-Ru; Su, Yu-Nung +4 more
We present results of a survey of methyl cyanide (CH3CN) J = 12-11 toward 56 sources, including 35 Extended Green Objects (EGOs) and 21 nearby AKARI counterparts, with the Submillimeter Telescope (SMT) in order to characterize the nature of EGOs. CH3CN, a tracer of hot core emission, is detected in 19 EGOs (∼54%) and five AKA…
Solving the distance discrepancy for the open cluster NGC 2453. The planetary nebula NGC 2452 is not a cluster member
Silva-Villa, E.; Moitinho, A.; Moni Bidin, C. +6 more
Context. The open cluster (OC) NGC 2453 is of particular importance since it has been considered to host the planetary nebula (PN) NGC 2452, however their distances and radial velocities are strongly contested.
Aims: In order to obtain a complete picture of the fundamental parameters of the OC NGC 2453, 11 potential members were studied. The …
Molecular environs and triggered star formation around the large Galactic infrared bubble N 24
Li, Dalei; Tang, Xindi; Zhou, Jianjun +10 more
A multi-wavelength analysis of the large Galactic infrared bubble N 24 is presented in this paper in order to investigate the molecular and star-formation environment around expanding H II regions. Using archival data from Herschel and ATLASGAL, the distribution and physical properties of the dust over the entire bubble are studied. Using the Clum…
The Complex Nature of Magnetic Element Transport in the Quiet Sun: The Lévy-walk Character
Giannattasio, F.; Berrilli, F.; Consolini, G. +1 more
The study of the dynamic properties of small-scale magnetic fields in the solar photosphere (magnetic elements, MEs) provides a fundamental tool to investigate some still unknown aspects of turbulent convection, and gain information on the spatial and temporal scales of evolution of the magnetic field in the quiet Sun. We track the MEs in a set of…
Estimating the solar wind pressure at comet 67P from Rosetta magnetic field measurements
Madanian, Hadi; Timar, Aniko; Nemeth, Zoltan +3 more
Aims: The solar wind pressure is an important parameter of space weather, which plays a crucial role in the interaction of the solar wind with the planetary plasma environment. Here we investigate the possibility of determining a solar wind pressure proxy from Rosetta magnetic field data, measured deep inside the induced magnetosphere of comet 67P…
High-mass Star Formation in the nearby Region G352.630-1.067. I. Parallax
Chen, Xi; Xu, Ye; Zhang, Bo +5 more
Young or forming high-mass stars that are nearby and not within a cluster environment have the potential to provide fundamental insights into star formation. In this paper we report such a candidate (G352.630-1.067), for which we have measured the distance through very long baseline interferometry parallax observations of the associated 6.7 GHz cl…