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Earthlike planet discovered orbiting around nearest star to Sun

Resumen: 
Located in the habitable zone, the planet orbits around its star in eleven days and has a mass of at least 1.3 times that of the Earth. Named Proxima B, it orbits around Proxima Centauri, a red dwarf located only four light years away from our own planet

The Institute of Astrophysics of Andalusia (IAA-CSIC) collaborated with an international group of astronomers in a study that recently discovered a planet in the vicinity of Proxima Centauri, the star nearest to the Sun. Named Proxima B, it is located in the habitable zone, i.e., the region around a star where conditions would allow for liquid water, and its mass is estimated to be only somewhat greater than that of the Earth.  The discovery, made in the context of the Pale Red Dot observation campaign, will be published tomorrow in Nature magazine.

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Se halla un planeta parecido a la Tierra alrededor de la estrella más cercana al Sol

Resumen: 
El planeta, que se halla en la zona de habitabilidad, gira en torno a su estrella cada once días y tiene una masa mínima de 1,3 veces la terrestre. Denominado Próxima b, gira alrededor de Próxima Centauri, una estrella enana roja situada tan solo a cuatro años luz de la Tierra

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How much dark matter is there inside early-type galaxies?

Titulo: 
How much dark matter is there inside early-type galaxies?
Autores: 
Nigoche-Netro, A., Ruelas-Mayorga, A., Lagos, P., Ramos-Larios, G., Kehrig, C., Kemp, S.N., Montero-Dorta, A.D., González-Cervantes, J.
Resumen: 
We study the luminous mass as a function of the dynamical mass inside the effective radius (re) of early-type galaxies (ETGs) to search for differences between these masses. We assume Newtonian dynamics and that any difference between these masses is due to the presence of dark matter. We use several samples of ETGs – ranging from 19 000 to 98 000 objects – from the ninth data release of the Sloan Digital Sky Survey. We perform Monte Carlo (MC) simulations (see Appendix A) of galaxy samples and compare them with real samples. The main results are (i) MC simulations show that the distribution of the dynamical versus luminous mass depends on the mass range where the ETGs are distributed (geometric effect). This dependence is caused by selection effects and intrinsic properties of the ETGs. (ii) The amount of dark matter inside re is approximately 7 ± 22 per cent. (iii) This amount of dark matter is lower than the minimum estimate (10 per cent) found in the literature and four times lower than the average (30 per cent) of literature estimates. However, if we consider the associated error, our estimate is of the order of the literature average.
Autor principal: 
Nigoche-Netro, A.
Autor/es del IAA: 
Kehrig, C.; Montero-Dorta, A.D.
DOI: 
10.1093/mnras/stu2045
Revista: 
Monthly Notices of the Royal Astronomical Society
Fecha de publicación: 
2015/01
Volumen: 
446
Issue: 
1
Páginas: 
85-103
Tipo de documento: 
ARTICLE
Palabras clave: 
galaxies: distances and redshifts; galaxies: fundamental parameters; galaxies photometry; dark matter

La lluvia de estrellas de las perseidas podría alcanzar los quinientos meteoros por hora

Resumen: 
El Instituto de Astrofísica de Andalucía (IAA-CSIC) participa en un proyecto de observación de las perseidas desde la estratosfera y en tres propuestas de divulgación relacionadas con la lluvia de estrellas

Todos los años, entre finales de julio y finales de agosto, la Tierra atraviesa en su trayectoria en torno al Sol la estela del cometa Swift-Tuttle, lo que provoca que multitud de partículas, denominadas meteoroides, choquen contra la atmósfera. Conforme la Tierra se va adentrando en esta nube de meteoroides, la actividad de las perseidas aumenta. En 2016 esa actividad, que se espera más intensa que los años anteriores, alcanzará su máximo visible en Europa durante la noche del 11 al 12 de agosto.

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Se observa el colapso de la atmósfera de Ío durante un eclipse de Júpiter

Resumen: 
Medidas muy precisas revelan que la sombra de Júpiter provoca que la atmósfera de Ío se condense en la superficie, para regenerarse cuando recibe de nuevo la luz solar

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The nature of the CM-MM emission in close Wolf-Rayet binaries

Titulo: 
The nature of the CM-MM emission in close Wolf-Rayet binaries
Autores: 
Montes, G., Alberdi, A., Pérez-Torres, M.A., González, R.F.
Resumen: 
The centimeter spectra of Wolf-Rayet (WR) binaries often show a contribution from a wind-wind collision region (WCR) between the stars. In short period systems (≲ 1 yr), such a component is expected to be absorbed by the unshocked winds, losing any effect from its binarity. Recent studies suggest that the WCR in these systems may also contribute to the emission at both centimeter and millimeter wavelengths. We analyzed and compared centimeter and millimeter observations of a total sample of 17 WR stars (including nine confirmed short-period systems) to detect any possible WCR contribution. More detailed observations are required in order to distinguish between different scenarios. We highlight the importance of analyzing the spectrum from quasi-simultaneous observations in a wide range of frequencies in order to properly characterize and distinguish any possible extra contribution.
Autor principal: 
Montes, G.
Autor/es del IAA: 
Alberdi, A., Pérez-Torres, M.A., González, R.F.
Revista: 
Revista Mexicana de Astronomia y Astrofisica
Fecha de publicación: 
2015/06/05
Volumen: 
51
Issue: 
2
Páginas: 
207-217
Tipo de documento: 
ARTICLE
Palabras clave: 
binaries [close]; radio continuum [stars]; stars [winds]; stars [outflows]; stars [Wolf-Rayet]

Participación del IAA en la reunión científica de la Sociedad Española de Astronomía (SEA)

Title: 
Participation of the IAA in the scientific meeting of the Spanish Astronomical Society
Resumen: 
La Sociedad Española de Astronomía organiza su XII Reunión Científica en Bilbao entre los días 18 y 22 de julio de 2016

Como en anteriores ocasiones, la idea que sustenta esta reunión es la de crear un foro de discusión científica, donde la astronomía española y sus invitados puedan presentar y debatir sus trabajos más recientes, promover nuevas líneas de colaboración y organizarse para abordar futuros retos.

Abstract: 
The Spanish Astronomical Society organizes its XII Scientific Meeting in Bilbao between 18 and 22 of July
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University of Almería, Calar Alto Observatory and IAA will enhance astronomical knowledge

Resumen: 
Among the collaboration projects that will be launched, stand out the creation of an astronomical lecture room at the UAL, the incorporation of trainees at the Observatory and the creation of a summer course that approach its work to the whole society

The University of Almería (UAL), Calar Alto Observatory (CAHA) and Instituto de Astrofísica de Andalucía (IAA-CSIC) have ratify a compromise in order to continue with the UAL-CSIC collaboration agreement signed in 1996, progressing in some of its contents. This Friday July 8th, a delegation from UAL, headed by the rector Carmelo Rodriguez, has visited Calar Alto Observatory installations, the biggest observatory in Europe mainland.

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La UAL, el Observatorio de Calar Alto y el IAA potenciarán el conocimiento astronómico

Resumen: 
Entre los proyectos de colaboración que se pondrán en marcha destaca la creación de un Aula de Astronomía en la UAL, la incorporación de alumnos en prácticas al Observatorio y la creación de un Curso de Verano que acerque su labor a toda la sociedad

La Universidad de Almería, el observatorio astronómico de Calar Alto y el Instituto de Astrofísica de Andalucía (IAA-CSIC) han ratificado un compromiso de continuar con el convenio de colaboración UAL-CSIC firmado en 1996, avanzando algunos de sus contenidos. Este viernes 8 de julio, una delegación de la UAL encabezada por el rector Carmelo Rodríguez ha visitado las instalaciones de Calar Alto, el mayor observatorio de Europa continental.

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The weird system of star CVSO 30: two planets at extreme distances

Resumen: 
A direct image has been taken of a planet so far away from his star that it takes twenty-seven thousand years for completing one orbit, and it shares the system with another planet which completes its orbit in just eleven hours

An international observation campaign has allowed to photograph a planet around CVSO 30 star which is part of a curious system: the newly found CVSO 30c orbits the star at a extreme distance (more than twenty times the distance between Neptune and the Sun), and contrasts with its partner CVSO 30b, found in 2012, that is only at 1.2 million kilometers from the star (Mercury, the planet closest to the Sun, is 58 million kilometers away from it).

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