Publications by authors named "S Spezzano"
Article Synopsis
- Brown dwarf companions to stars help us understand planet formation processes, but some of them are more massive than expected based on their luminosities and host star ages.
- Gliese 229 B, previously thought to be a single entity, was revealed through observations to actually be two brown dwarfs, Gliese 229 Ba and Bb, with masses of 38.1 and 34.4 Jupiter masses, respectively.
- This discovery challenges existing theories and raises questions about the formation and occurrence of binary brown dwarfs in close orbits around stars.
Article Synopsis
- Researchers are studying the multi-scale interstellar medium (ISM) of our Galaxy to understand the relationships between gas, dust, and star formation in Giant Molecular Clouds (GMCs).
- The Milky Way's complex structure is influenced by massive stars and dust lanes, making it essential to observe these features at (sub-)millimeter wavelengths for in-depth analysis.
- A proposed 50m single-dish sub-mm telescope called AtLAST aims to provide comprehensive observations of the Galactic Plane and surrounding areas to enhance our understanding of stellar formation, planetary system evolution, and the overall ecology of our Galaxy.
Rotational (de)-excitation of cyclic and linear CH by collision with He.
Phys Chem Chem Phys
January 2019
Among the closed-shell hydrocarbons, the carbenes c- and l-CH are the lightest ones to display a permanent electric dipole moment and be detectable by rotational spectroscopy. The cyclic form, cyclopropenylidene, is ubiquitous in the InterStellar Matter (ISM) of the Milky Way and external galaxies. As such, it serves as a marker to help in characterizing the physical conditions of the ISM.
View Article and Find Full Text PDFThe rotational spectra of thioisocyanic acid (HNCS), and its three energetic isomers (HSCN, HCNS, and HSNC) have been observed at high spectral resolution by a combination of chirped-pulse and Fabry-Pérot Fourier-transform microwave spectroscopy between 6 and 40 GHz in a pulsed-jet discharge expansion. Two isomers, thiofulminic acid (HCNS) and isothiofulminic acid (HSNC), calculated here to be 35-37 kcal mol(-1) less stable than the ground state isomer HNCS, have been detected for the first time. Precise rotational, centrifugal distortion, and nitrogen hyperfine coupling constants have been determined for the normal and rare isotopic species of both molecules; all are in good agreement with theoretical predictions obtained at the coupled cluster level of theory.
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