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Organic matter in interstellar dust lost at the approach to the heliosphere. Exothermic chemical reactions of free radicals ignited by the Sun
Kimura, Hiroshi; Postberg, Frank; Altobelli, Nicolas +1 more
Aims: We tackle the conundrums of organic materials missing from interstellar dust when measured inside the Solar System, while undoubtedly existing in the local interstellar cloud (LIC), which surrounds the Solar System.
Methods: We present a theoretical argument that organic compounds sublimate almost instantaneously by exothermic reac…
Ionospheric total electron content of comet 67P/Churyumov-Gerasimenko
Henri, Pierre; Hajra, Rajkumar; Galand, Marina +6 more
We study the evolution of a cometary ionosphere, using approximately two years of plasma measurements by the Mutual Impedance Probe on board the Rosetta spacecraft monitoring comet 67P/Churyumov-Gerasimenko (67P) during August 2014-September 2016. The in situ plasma density measurements are utilized to estimate the altitude-integrated electron num…
Numerical simulation and data analysis of the 23 July 2012 SEP event observed by ACE, STEREO-A, and STEREO-B
Qin, G.; Qi, S. -Y.
An extremely powerful, superfast interplanetary coronal mass ejection (ICME) from the Sun on 23 July 2012 was detected by widely separated multiple spacecraft, namely STEREO-A, STEREO-B, and ACE, together with the ICME-driven shock and associated solar energetic particles (SEPs). We use the Parker spiral magnetic field model to analyze the relatio…
The Molecular Clouds Associated with the H II Regions/Candidates between L = 207°7 and L = 211°7
Wang, Hongchi; Ma, Yuehui; Zhang, Miaomiao +2 more
Using the PMO-13.7 m millimeter telescope at Delingha in China, we have conducted a large-scale simultaneous survey of 12CO, 13CO, and C18O J = 1 - 0 emission toward the sky region centered at l = 209°7, b = -2°25 with a coverage of 4°0 × 4°5. The majority of the emission in the region comes from the clouds with ve…
AG Leonis Minoris-An evolved, detached eclipsing binary
Nelson, Robert H.
Radial velocity data and photometric light curves (in the B. V, and Ic passbands) for the detached eclipsing binary AG Leo Minoris were acquired-apparently for the first time-and are reported here. Roche modelling using the 2003 version of the Wilson-Devinney code was completed, yielding the basic parameters. The period appears to be co…
A Test of Gravitational Theories Including Torsion with the BepiColombo Radio Science Experiment
Schettino, Giulia; Serra, Daniele; Tommei, Giacomo +1 more
Within the framework of the relativity experiment of the ESA/JAXA BepiColombo mission to Mercury, which was launched at the end of 2018, we describe how a test of alternative theories of gravity, including torsion can be set up. Following March et al. (2011), the effects of a non-vanishing spacetime torsion have been parameterized by three torsion…
HST/FGS Trigonometric Parallaxes of M-dwarf Eclipsing Binaries
Schaefer, Gail H.; Nelan, Edmund P.; Ciardi, David R. +5 more
Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) trigonometric parallax observations were obtained to directly determine distances to five nearby M-dwarf/M-dwarf eclipsing binary systems. These systems are intrinsically interesting as benchmark systems for establishing basic physical parameters for low-mass stars, such as luminosity L, and …
Environmental Impact on Star-forming Galaxies in a z ∼ 0.9 Cluster during the Course of Galaxy Accretion
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +18 more
Galaxies change their properties as they assemble into clusters. In order to understand the physics behind that, we need to go back in time and observe directly what is occurring in galaxies as they fall into a cluster. We have conducted a narrowband and J-band imaging survey on a cluster CL1604-D at z = 0.923 using a new infrared instrument SWIMS…
Multiwavelength Imaging and Spectral Analysis of Jet-like Phenomena in a Solar Active Region Using IRIS and AIA
Morgan, Huw; Humphries, Llŷr Dafydd; Verwichte, Erwin +1 more
High-resolution observations of dynamic phenomena give insights into the properties and processes that govern the low solar atmosphere. We present an analysis of jet-like phenomena emanating from a penumbral footpoint in active region (AR) 12192 using imaging and spectral observations from the Interface Region Imaging Spectrograph (IRIS) and the A…
The Nature of the Double Nuclei in the Barred S0 Galaxy IC 676
Zhou, Xu; Ma, Jun; Zhou, Zhimin +1 more
The lenticular galaxy IC 676 is a barred galaxy with double nuclei and active star formation in the central region. In this work we present the long-slit spectroscopy and archival multiwavelength images to investigate the nature and origin of the double nuclei in IC 676. Through photometric 1D brightness profiles and 2D image decomposition, we sho…