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First detection of 13CH in the interstellar medium
Wyrowski, Friedrich; Menten, Karl M.; Jacob, Arshia M. +3 more
In recent years, a plethora of observations with high spectral resolution of sub-millimetre and far-infrared transitions of methylidene (CH), conducted with Herschel and SOFIA, have demonstrated this radical to be a valuable proxy for molecular hydrogen that can be used for characterising molecular gas within the interstellar medium on a Galactic …
The origin and fate of volatile elements on Earth revisited in light of noble gas data obtained from comet 67P/Churyumov-Gerasimenko
Bekaert, David V.; Broadley, Michael W.; Marty, Bernard
The origin of terrestrial volatiles remains one of the most puzzling questions in planetary sciences. The timing and composition of chondritic and cometary deliveries to Earth has remained enigmatic due to the paucity of reliable measurements of cometary material. This work uses recently measured volatile elemental ratios and noble gas isotope dat…
Effects of Radial Distances on Small-scale Magnetic Flux Ropes in the Solar Wind
Hu, Qiang; Chen, Yu
Small-scale magnetic flux ropes (SFRs) in the solar wind have been studied for decades. Statistical analysis utilizing various in situ spacecraft measurements is the main observational approach to investigating the generation and evolution of these small-scale structures. Based on the Grad-Shafranov reconstruction technique, we use the automated d…
Edge collapse and subsequent longitudinal accretion in filament S242
Kim, Kee-Tae; Liu, Tie; Yuan, Jinghua +7 more
Filament S242 is 25 pc long with massive clumps and YSO clusters concentrated in its end regions; it is considered a good example of edge collapse. We mapped this filament in the 12CO(1-0) and 13CO(1-0) lines. A large-scale velocity gradient along filament S242 has been detected; the relative velocity between the two end-clum…
Phase-dependent Study of Near-infrared Disk Emission Lines in LB-1
Soria, Roberto; Liu, Jifeng; Wang, Shu +18 more
The mass, origin, and evolutionary stage of the binary system LB-1 have been intensely debated, following the claim that it hosts an ∼70M⊙ black hole, in stark contrast with the expectations for Galactic remnants. We conducted a high-resolution, phase-resolved spectroscopic study of its Paschen lines, using the Calar Alto 3.5 m telescop…
The Gaia-ESO Survey: Carbon Abundance in the Galactic Thin and Thick Disks
Kordopatis, Georges; Calura, Francesco; Bragaglia, Angela +24 more
This paper focuses on carbon, which is one of the most abundant elements in the universe and is of high importance in the field of nucleosynthesis and galactic and stellar evolution. The origin of carbon and the relative importance of massive and low- to intermediate-mass stars in producing it is still a matter of debate. We aim at better understa…
2MASS J15460752-6258042: a mid-M dwarf hosting a prolonged accretion disc
Song, Inseok; Lee, Jinhee; Murphy, Simon
We report the discovery of the oldest (∼55 Myr) mid-M type star known to host ongoing accretion. 2MASS J15460752-6258042 (2M1546, spectral type M5, 59.2 pc) shows spectroscopic signs of accretion such as strong H α, He I, and [O I] emission lines, from which we estimate an accretion rate of ∼10-10 M⊙ yr-1. Consider…
Herschel Gould Belt Survey Observations of Dense Cores in the Cepheus Flare Clouds
Ward-Thompson, Derek; Arzoumanian, Doris; Di Francesco, James +17 more
We present Herschel SPIRE and PACS maps of the Cepheus Flare clouds L1157, L1172, L1228, L1241, and L1251, observed by the Herschel Gould Belt Survey of nearby star-forming molecular clouds. Through modified blackbody fits to the SPIRE and PACS data, we determine typical cloud column densities of (0.5-1.0) × 1021 cm-2 and typ…
The STIX Aspect System (SAS): The Optical Aspect System of the Spectrometer/Telescope for Imaging X-Rays (STIX) on Solar Orbiter
Strassmeier, K. G.; Krucker, S.; Mann, G. +28 more
The Spectrometer/Telescope for Imaging X-rays (STIX) is a remote sensing instrument on Solar Orbiter that observes the hard X-ray bremsstrahlung emission of solar flares. This paper describes the STIX Aspect System (SAS), a subunit that measures the pointing of STIX relative to the Sun with a precision of ±4″, which is required to accur…
Implications for the origin and evolution of Martian Recurring Slope Lineae at Hale crater from CaSSIS observations
Pajola, M.; Cremonese, G.; Thomas, N. +9 more
Recurring Slope Lineae (RSL) are narrow, dark features that typically source from rocky outcrops, incrementally lengthen down Martian steep slopes in warm seasons, fade in cold seasons and recur annually. In this study we report the first observations of RSL at Hale crater, Mars, during late southern summer by the Color and Surface Science Imaging…