%0 Generic %1 hara2012formation %A Hara, Tetsuya %A Kunitomo, Shuhei %A Shigeyasu, Masanobu %A Kajiura, Daigo %D 2012 %K age astronomy formation planetary system %R 10.1017/S1743921308016785 %T On the Formation Age of the First Planetary System %U http://arxiv.org/abs/1204.0596 %X Recently, it has been observed the extreme metal-poor stars in the Galactic halo, which must be formed just after Pop III objects. On the other hand, the first gas clouds of mass $10^6 M_ødot$ are supposed to be formed at $ z $ 10, 20, and 30 for the $1\sigma$, $2$ and $3\sigma$, where the density perturbations are assumed of the standard $Łambda$CDM cosmology. If we could apply this gaussian distribution to the extreme small probability, the gas clouds would be formed at $ z $40, 60, and 80 for the $4\sigma$, $6\sigma$, and $8\sigma$. The first gas clouds within our galaxy must be formed around $z40$. Even if the gas cloud is metal poor, there is a lot of possibility to form the planets around such stars. The first planetary systems could be formed within $610^7$ years after the Big Bang in the universe. Even in our galaxies, it could be formed within $1.710^8$ years. It is interesting to wait the observations of planets around metal-poor stars. For the panspermia theory, the origin of life could be expected in such systems.

@misc{hara2012formation, abstract = {Recently, it has been observed the extreme metal-poor stars in the Galactic halo, which must be formed just after Pop III objects. On the other hand, the first gas clouds of mass $\sim 10^6 M_{\odot}$ are supposed to be formed at $ z \sim $ 10, 20, and 30 for the $1\sigma$, $2\sigma $ and $3\sigma$, where the density perturbations are assumed of the standard $\Lambda$CDM cosmology. If we could apply this gaussian distribution to the extreme small probability, the gas clouds would be formed at $ z \sim $40, 60, and 80 for the $4\sigma$, $6\sigma$, and $8\sigma$. The first gas clouds within our galaxy must be formed around $z\sim 40$. Even if the gas cloud is metal poor, there is a lot of possibility to form the planets around such stars. The first planetary systems could be formed within $\sim 6\times 10^7$ years after the Big Bang in the universe. Even in our galaxies, it could be formed within $\sim 1.7\times 10^8$ years. It is interesting to wait the observations of planets around metal-poor stars. For the panspermia theory, the origin of life could be expected in such systems.}, added-at = {2012-04-04T17:44:43.000+0200}, author = {Hara, Tetsuya and Kunitomo, Shuhei and Shigeyasu, Masanobu and Kajiura, Daigo}, biburl = {https://www.bibsonomy.org/bibtex/2fb97b5e5011afbf5e37b94262b6d0032/eufisica}, description = {On the Formation Age of the First Planetary System}, doi = {10.1017/S1743921308016785}, interhash = {f934b33202dc2b2b2abf0fa9ef30f09e}, intrahash = {fb97b5e5011afbf5e37b94262b6d0032}, keywords = {age astronomy formation planetary system}, note = {cite arxiv:1204.0596Comment: 5 pages,Proceedings IAU Symposium No. 249, 2007, Exoplanets:Y-S. Sun, S. Ferraz-Mello and J.-L, Zhou, eds. (p325)}, timestamp = {2013-08-26T08:25:51.000+0200}, title = {On the Formation Age of the First Planetary System}, url = {http://arxiv.org/abs/1204.0596}, year = 2012 }