A new optical technology Made in Spain to detect SARS-Cov-2

portada es

Almería (Spain), February 18th, 2022

A team of Spanish researchers, coordinated by the University of Seville, with participation of Calar Alto Observatory and the Institute of Astrophysics of Andalusia (IAA-CSIC), was able to detect the coronavirus that causes COVID-19 using a new optical methodology. This tool could be potentially usable for massive, fast and easy-to implement screening.

A multidisciplinary collaboration, whose first results are published in the journal Scientific Reports, from the Nature Group, has obtained a sensitivity of 100% and a specificity of 87.5% in the detection of SARS-CoV-2 in nasopharyngeal exudate (the same samples used in a PCR test) from symptomatic people. It has also been possible to detect the presence of SARS-CoV-2 in fresh saliva of asymptomatic people, as well as to detect, differentiate and quantify two types of synthetic viruses (lentiviruses and synthetic coronaviruses) in two biofluids (saline solution and artificial saliva).

Read more ...

Re-encounter with a planetary nebula nearly 30 years later


January 13th 2022

The Institute of Astrophysics of Andalusia (IAA-CSIC) leads a study based on data from Calar Alto Observatory (CAHA), showing the variability of the planetary nebula IC4997. The changes can be seen comparing observations taken nearly 30 years apart with the CAHA 2.2-meter telescope. This suggests that the central star of this planetary nebula probably hides a companion star.

Planetary nebulae represent one of the final stages in the life of low- and intermediate-mass stars, similar to the Sun. After exhausting their fuel, the outer layers of such stars are taken off, forming a fluorescent envelope around a white dwarf star (the "naked" core of the star after the expulsion of its outer layers). In some tens of thousands of years, the nebula will disperse in the interstellar medium and the central star will become extinct, so that all planetary nebulae are expected to be (very slowly) variable. However, some of them present a variability unrelated to their natural evolution, which reveals processes that deviate from the norm. This is the case of IC4997, a nebula with which a Spanish team led by the Institute of Astrophysics of Andalusia (IAA-CSIC) has found itself again, thirty years later.

Read more ...

First-time detection of oxygen in the atmosphere of an ultra-hot exoplanet

portada es

December 22nd 2021

Reanalyzing CARMENES observations of the Kelt-9b exoplanet, taken at Calar Alto, an international team with participation of the Institute of Astrophysics of Andalusia (IAA-CSIC) has revealed the presence of oxygen in this exoplanet atmosphere, the hottest known to date. It is the very first time that atoms of oxygen are detected in a planet outside the Solar System.

Since the discovery, in 1995, of the first planet outside of our Solar System, more than four thousand exoplanets have been detected. During these decades, science teams from all over the world have tried to characterize their atmospheres and to explain why these new worlds are so different from the planets of the Solar System. Now, an international team, with participation of the Institute of Astrophysics of Andalusia, publishes in the Nature Astronomy journal the finding of atoms of oxygen in the exoplanet named Kelt-9b. It is the very first detection of the compound, that human beings commonly associate to life, in the atmosphere of an exoplanet.

Read more ...

Giant planets could reach maturity sooner than expected

portada en

December 2nd 2021

Calar Alto Observatory and the Institute of Astrophysics of Andalusia (IAA-CSIC) participate in the study of the giant planets of the V1298 Tauri system, which in just twenty million years have already reached their final size: a contraction time much shorter than expected. The finding has been possible thanks, in particular, to radial velocity measurements from the HARPS-N spectrographs, at Roque de los Muchachos Observatory (ORM), and from CARMENES, at Calar Alto Observatory (CAHA)

Current theories of planetary evolution predict that giant planets, such as Jupiter or Saturn, are born with large dimensions and very low densities and that, after hundreds of millions of years of slow contraction, they reach their final size. However, these expectations do not have corroborating evidence, and a recent finding shows that they may not correspond to reality in some cases. An international scientific team has measured the mass of the planets of the V1298 Tauri system, one of the youngest known, and concludes that the giant planets could complete their contraction much faster than expected. The result is published in the journal Nature Astronomy.

Read more ...