* Astronomy

Members Login
Post Info TOPIC: CoRot-Exo-7b


L

Posts: 131433
Date:
RE: CoRot-Exo-7b
Permalink  
 


Israeli scientist helps discover planet 'very similar to Earth'
A team of scientists, including an Israeli researcher, announced the discovery Wednesday of a hitherto unknown planet they described as extremely similar to Earth, some 500 light years from our solar system.
The revelation bolsters the theory that the universe holds billions of planets revolving around stars similar to the Earth's sun.


Read more

__________________


L

Posts: 131433
Date:
Permalink  
 



__________________


L

Posts: 131433
Date:
Permalink  
 

A new study of the planet, which orbits a star 500 light years away, has shown that its density is similar to Earth's, indicating it is a solid rocky world.
Known as COROT-7b, it was discovered in February this year by the European space telescope COROT, which had been tracking the star it circles.


Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

First Solid Evidence for a Rocky Exoplanet
The longest set of HARPS measurements ever made has firmly established the nature of the smallest and fastest-orbiting exoplanet known, CoRoT-7b, revealing its mass as five times that of Earth's. Combined with CoRoT-7b's known radius, which is less than twice that of our terrestrial home, this tells us that the exoplanet's density is quite similar to the Earth's, suggesting a solid, rocky world. The extensive dataset also reveals the presence of another so-called super-Earth in this alien solar system.

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

Astronomers find rocky planet outside solar system
Astronomers have finally found a place outside our solar system where there's a firm place to stand - if only it weren't so broiling hot.
As scientists search the skies for life elsewhere, they have found more than 300 planets outside our solar system. But they all have been gas balls or can't be proven to be solid. Now a team of European astronomers has confirmed the first rocky extrasolar planet.

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 

Super-Earth has rocky surface
The smallest planet yet detected outside our Solar System appears to have a solid surface, European astronomers say.
In a paper to be published in the journal Astronomy and Astrophysics, the European team describe the exoplanet CoRoT-7b, a so-called Super-Earth, which has a diameter approximately twice that of Earth.
The astronomers say the planet orbits its star once every 20 hours, making it the shortest orbital period yet detected.

Read more

__________________


L

Posts: 131433
Date:
CoRoT-7b
Permalink  
 


Title: Composition and fate of short-period super-Earths: The case of CoRoT-7b
Authors: Diana Valencia, Masahiro Ikoma, Tristan Guillot, Nadine Nettelmann

Context. The discovery of CoRotT-7b, a planet of radius 1.68 ±0.09 R_Earth, with an orbital period of 0.854 days demonstrates that small planets can orbit extremely close to their star.
Aims. Several questions arise concerning this planet, in particular concerning its possible composition, mass and fate. Methods. We use knowledge of hot Jupiters, mass loss estimates and models for the interior structure and evolution of planets to understand its composition, structure and evolution.
Results. Although detailed modelling should address this problem, we show that a relatively significant mass loss ~10^11 g/s is to be expected, independently of the planet's composition. Given the closeness to the star, we find that the planet size is compatible with the observations only if the planet contains less than 1% of its mass in hydrogen and helium and less than 20% in steam. Due to the significant evaporation rate, it is most likely that the planet is made only of iron and silicates, which implies that its mass should be in the range 5 to 15 M_Earth. However, the origin of CoRoT-7b is unknown: It may have always had a terrestrial composition, it may be the remnant of a Uranus-like ice giant, or a gas giant with a small core that would have been entirely stripped of its gaseous envelope.
Conclusions. Our predictions can be tested by measurements of the planet mass and possibly by the detection of evaporating silicates, with a rate that should be within an order of magnitude that measured for HD209458b.

Read more (4909kb, PDF)

__________________


L

Posts: 131433
Date:
RE: CoRot-Exo-7b
Permalink  
 


An international team of scientists has found that giant exoplanets orbiting very close to their stars could lose a quarter of their mass during their lifetime. The team found that planets that orbit closer than 2% of an Astronomical Unit (AU), the distance between the Earth and the Sun, may lose their atmospheres completely, leaving just their core. The team, led by Dr Helmut Lammer of the Space Research Institute of the Austrian Academy of Sciences, believe that the recently discovered CoRoT-7b "Super Earth", which has less than twice the mass of the Earth, could be the stripped core of a Neptune-sized planet.  Dr Lammer is presenting results at the European Week of Astronomy and Space Science at the University of Hertfordshire.

Read more

__________________


L

Posts: 131433
Date:
Permalink  
 


COROT has found the smallest terrestrial planet ever detected outside the Solar System. The amazing planet is less than twice the size of Earth and orbits a Sun-like star. Its temperature is so high that it is possibly covered in lava or water vapour. About 330 exoplanets have been discovered so far, most of which are gas giants with characteristics similar to Jupiter and Neptune. The new find, COROT-Exo-7b, is different: its diameter is less than twice that of Earth and it orbits its star once every 20 hours. It is located very close to its parent star, and has a high temperature, between 1000 and 1500°C. Astronomers detected the new planet as it transited its parent star, dimming the light from the star as it passed in front of it.

__________________


L

Posts: 131433
Date:
Permalink  
 

Une planète guère plus grosse que la Terre vient d'être découverte par  le satellite CoRoT... Rocheuse ou "planète-sauna" ? En tout cas  il s'agit ici d'un objet étonnant. Ce compagnon d'une étoile orange est d'une taille inférieure à deux fois celle de la Terre. Ce serait donc la plus petite taille d'exoplanète jamais mesurée. La température est telle (plus de 1000 degrés) qu'elle serait recouverte de lave ou de vapeur d'eau.

Read more  (French)

__________________
«First  <  1 2 3  >  Last»  | Page of 3  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard