a planet that is slightly larger and heavier than our Earth.
Super-Earths around the M-dwarf neighbors Gl433 and Gl667C, submitted to Astronomy & Astrophysics, Svein Rosselands hus (map)
GJ667Cc, the new prime candidate for a habitable world, is only 22 lightyears (or 200 million million kilometres) away, which is in our direct cosmological neighbourhood.
M-dwarfs are currently investigated here at the Institute of Theoretical Astrophysics.
Credit: S. Wedemeyer, University of Oslo (2012). Gliese 667 Cc má celkem tři mateřské hvězdy. Nejmenší z hvězd, červený trpaslík Gliese 667 C spektrální třídy M2V je o 31 % lehčí, o 42 % menší než Slunce.
2020 v 11:47. Figure 4: Tardigrades or “waterbears” are examples for animals that can exist and develop under extreme conditions here on the Earth. Jeden tamější rok trvá něco přes 28 dní a teplota na povrchu je odhadována na 4 °C.
Kelc'htreiñ a ra en-dro d'ar steredenn Gliese 667 C hag a zo ur steredenn gorr ruz, lec'hiet da 22,7 bloavezh gouloù eus an Heol.
Waterbears tolerate extreme temperatures from just above absolute zero (-273 °C) to about +150 °C. Less than 20 years ago before the discovery of the first exoplanets, we could only speculate about the possible existence of such planets. 10. The increasing number of known potentially habitable planets suggests that such planets might be frequent in the universe.
Planet ima masu 3,7 puta veću od mase Zemlje, a orbitalni period je 28 dana. While Kepler-22b is orbiting a sun-like star, GJ667Cc is accompanying a red dwarf star of spectral type M. Stars of this type, also called “M-dwarfs”, are smaller and cooler than our Sun but make up at least 60% of all stars. Together with the fact that the red dwarf star emits almost no ultraviolet light, these varying light conditions could be a potential problem for the formation of life as we know it.
The days, however, could be very long.
These hardened creatures have even been returned alive from studies in low earth orbit where they were exposed to space conditions. Točna temperatura na površini je ipak neizvjesna i ovisi o nizu još nepoznatih čimbenika.
Gliese 667 Cc je egzoplanet koji orbitira crvenog patuljka Gliese 667 C, koji je dio sustava Gliese 667.
Budući da je planet vjerojatno plimno vezan, možda je prevruć na jednoj, a prehladan na drugoj te je dobro samo u "terminator liniji".
The two other stars Gliese 667A and B would be visible on the sky, see upper left corner on the picture to the right. The discovery was announced already in last November and recently confirmed (see references below). Our Sun would also be seen with the naked eye as a distant star. Although GJ667Cc is located in a habitable zone, the conditions on the planet could be very different from our Earth.
The HARPS search for southern extra-solar planets XXXI.
Gliese 667Cc is located in the habitable zone of its host star and is currently the most Earth-like planet known (ESI=0.82).
Planeta je svými parametry dosti podobná té naší a teoreticky by na ni mohl být život.
obyvatelné zóně, kde se může voda vyskytovat v kapalném skupenství. For a more extreme case like a Venus-type atmosphere, the pressure could be several hundred times larger, which corresponds to a water pressure a few kilometres deep down in the ocean on Earth. Furthermore, GJ667 is part of a triple star system. Comparison of the planets that are currently the promising candidates for potentially habitable worlds.
More details about this discovery are available in the HEC project area of the PHL website. Due to the short distance to its central star, GJ667Cc orbits this star in only 28 days.
Drugi je otkriven planet u tom sustavu. Zahvaljujući mnogo nižem energetskom ishodu, naseljena zona oko crvene patuljaste zvijezde Gliese 667 C mnogo je bliža (između 0,11 i 0,23 AJ).
Many red dwarfs may be often covered by starspots (the analogues of sunspots) that could reduce the energy output of the star by as much as 40% for periods that may last months.
By now, more than 700 exoplanets are known, while over 2000 candidates wait for confirmation – among them many in the so-called habitable zone around their host stars (see Figure 1).
Many M-dwarf stars – among them GJ667C – are known to emit flares, which are intense bursts of radiation and energetic particles.
We can only speculate how fauna and flora – if present at all – would evolve under such different conditions. The planet GJ667Cc is even more similar to our Earth than Kepler-22b, which was confirmed as a potentially habitable planet just a few weeks ago.
0315 Planet ima masu 3,7 puta veću od mase Zemlje, a orbitalni period je 28 dana.
The star casts a faint reddish light on the planet’s surface.
This red dwarf star therefore emits much less radiation than the Sun, reaching a luminosity of only just over one percent of the solar value.
Der Exoplanet hat eine Mindestmasse von wenigen Erdmassen und liegt in der habitablen Zone.Das System ist 6,8 Parsec bzw. The red dwarf would be seen as a red disk that, in comparison to the Sun, is about 3 times as wide and covers about 10 times the area (see Figure 3). Consequently, the atmospheric pressure at the planetary surface is likely to be higher.
Although the star is much smaller than the Sun, it would appear larger on the sky and cast a faint reddish light on the planet’s surface.