Infrared spectra of carbon-rich objects which have evolved off the asymptotic giant branch reveal a range of dust properties, including fullerenes, polycyclic aromatic hydrocarbons (PAHs), aliphatic hydrocarbons, and several unidentified […]
astro-ph.SR
Posted inAstrochemistry, Biochemistry & Organic Chemistry
Census of Complex Organic Molecules in Solar Type Protostar IRAS16293-2422
Complex Organic Molecules (COMs) are considered crucial molecules, since they are connected with organic chemistry, at the basis of the terrestrial life. More pragmatically, they are molecules in principle difficult […]
Posted inExoplanets, -moons, -comets
Signatures of Cloud, Temperature, and Gravity From Spectra of the Closest Brown Dwarfs
We present medium resolution optical and NIR spectral data for components of the newly discovered WISE J104915.57-531906.1AB (Luhman 16AB) brown dwarf binary. The optical spectra reveal strong 6708 A Li […]
Posted inAstronomy & Telescopes
Elemental Abundances of Solar Sibling Candidates
Dynamical information along with survey data on metallicity and in some cases age have been used recently by some authors to search for candidates of stars that were born in […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets
Direct Imaging of Planet Transit Events
Exoplanet transit events are attractive targets for the ultrahigh-resolution capabilities afforded by optical interferometers. The intersection of two developments in astronomy enable direct imaging of exoplanet transits: first, improvements in […]
Posted inBiosignatures & Paleobiology, Exoplanets, -moons, -comets
Some inconvenient truths about biosignatures involving two chemical species on Earth-like exoplanets
The detection of strong thermochemical disequilibrium in the atmosphere of an extrasolar planet is thought to be a potential biosignature. In this article we present a new kind of false […]
Posted inAstrochemistry
Detectability of Glycine in Solar-type System Precursors
Glycine (NH2CH2COOH) is the simplest amino acid relevant for life. Its detection in the interstellar medium is key to understand the formation mechanisms of pre-biotic molecules and their subsequent delivery […]
Posted inAstrochemistry, Astronomy & Telescopes
Evolution of Surface Carbon, Nitrogen, Oxygen Abundances in Massive Stars
The nitrogen to carbon (N/C) and nitrogen to oxygen (N/O) ratios are the most sensitive quantities to mixing in stellar interiors of intermediate and massive stars. We further investigate the […]
Posted inExoplanets, -moons, -comets
Water Clouds in Y Dwarfs and Exoplanets
The formation of clouds affects brown dwarf and planetary atmospheres of nearly all effective temperatures. Iron and silicate condense in L dwarf atmospheres and dissipate at the L/T transition. Minor […]
Posted inAstrochemistry, Astronomy & Telescopes
Light Echoes from n Carinae's Great Eruption: Spectrophotometric Evolution and the Rapid Formation of Nitrogen-rich Molecules
By obtaining images and spectra at the same light echo position between 2011 and 2014, we follow the evolution of the Great Eruption on a three-year timescale. By obtaining images […]