2M1207b
 Primerjava velikosti 2M1207b z Jupitrom. | |
| Odkritje | |
|---|---|
| Odkritelj | Chauvin et al. |
| Kraj odkritja | Observatorij Paranal, Čile |
| Datum odkritja | april 2004 |
| Fotografija | |
| Značilnosti tira | |
| 24–231 AU (3,6×109–3,46×1010 km)[1] | |
| Izsrednost | 0,02–0,98[1] |
| 633–20046[1] y | |
| Naklon tira | 13–150[1] |
| 7–174[1] | |
Čas periastrona | 2107,69–12883,36[1] |
| 4–176[1] | |
| Fizikalne značilnosti | |
Srednji polmer | 1,5[2] RJ |
| Masa | 4+6 −1[2] MJ |
| Temperatura | 1600 ± 100 K[3] |
2M1207b je telo z maso planeta, ki kroži okoli rjave pritlikavke 2M1207 v ozvezdju Kentavra okoli 170 svetlobnih let od Zemlje.[4] To je eden izmed prvih kandidatov za eksoplanet, ki so ga direktno opazovali (z infrardečim slikanjem). Aprila 2004 ga je ekipa iz Evropskega južnega observatorija, ki jo je vodil Gaël Chauvinje, odkrila s pomočjo Zelo velikega teleskopa (VLT) na observatoriju Paranal v Čilah.[5] Domnevajo, da je od 3 do 10-krat masivnejši od Jupitra, okoli rjave pritlikavke 2M1207 pa kroži na razdalji približno enaki Plutonovi do Sonca.[2]
Telo je zelo vroč plinasti orjak; povprečna površinska temperatura je okoli 1600 K (1300 °C), kar je večinoma posledica gravitacije planeta samega.[3] Njegova masa je pod izračunano mejo za zlivanje devterija v rjavih pritlikavkah, ki je 13 mas Jupitra. Projicirana razdalja med 2M1207b in zvezdo je okoli 40 AU (podobna oddaljenosti Plutona in Sonca).[6] Njegov infrardeči spekter nakazuje prisotnost vodnih molekul v ozračju.[7] Planet najverjetneje nima življenja, niti na površini, niti na satelitih.
Glej tudi
[uredi | uredi kodo]- Zunajosončna luna (eksoluna)
- HD 172555
- Ubežni planet
Sklici
[uredi | uredi kodo]- ↑ 1,0 1,1 1,2 1,3 1,4 1,5 1,6 Blunt, Sarah; in sod. (2017). »Orbits for the Impatient: A Bayesian Rejection-sampling Method for Quickly Fitting the Orbits of Long-period Exoplanets«. The Astronomical Journal. 153 (5). 229. arXiv:1703.10653. Bibcode:2017AJ....153..229B. doi:10.3847/1538-3881/aa6930.
- ↑ 2,0 2,1 2,2 Star: 2M1207 Arhivirano 2011-10-06 na Wayback Machine., Extrasolar Planets Encyclopaedia. Accessed on line June 15, 2008.
- ↑ 3,0 3,1 The Planetary Mass Companion 2MASS 1207-3932B: Temperature, Mass, and Evidence for an Edge-on Disk, Subhanjoy Mohanty, Ray Jayawardhana, Nuria Huelamo, and Eric Mamajek, Astrophysical Journal 657, #2 (March 2007), pp. 1064–1091. DOI: 10.1086/510877.
- ↑ "The Distance to the 2M1207 System" Arhivirano 2008-01-24 na Wayback Machine., Eric Mamajek, November 8, 2007. Accessed on line June 15, 2008.
- ↑ A giant planet candidate near a young brown dwarf. Direct VLT/NACO observations using IR wavefront sensing, G. Chauvin, A.-M. Lagrange, C. Dumas, B. Zuckerman, D. Mouillet, I. Song, J.-L. Beuzit, P. Lowrance, Astronomy and Astrophysics, 425 (October 2004), pp. L29–L32. DOI: 10.1051/0004-6361:200400056.
- ↑ Estimated observed projected separation from observed angular separation and estimated distance.
- ↑ Yes, it is the Image of an Exoplanet: Astronomers Confirm the First Image of a Planet Outside of Our Solar System, ESO Press Release 12/05, April 30, 2005, European Southern Observatory. Accessed on line July 10, 2010.
Zunanje povezave
[uredi | uredi kodo]- ESO Press Release 12/05:Yes, it is the Image of an Exoplanet
- BBC: Planet 'seen' around distant sun
- Space.com - Astronomers Confident: Planet Beyond Solar System Has Been Photographed
- Space.com article on the discovery
- Jean Schneider (2011). »Notes for Planet 2M1207 b«. Extrasolar Planets Encyclopaedia. Arhivirano iz prvotnega spletišča dne 9. novembra 2011. Pridobljeno 3. oktobra 2011.
- "A Giant Planet Candidate Near a Young Brown Dwarf" (PDF) from the European Southern Observatory.
- Space.com: Fresh Debate over First Photo of Extrasolar Planet
- "A Moving Cluster Distance to the Exoplanet 2M1207 B in the TW Hydrae Association"
- "The Planetary Mass Companion 2MASS 1207-3932B: Temperature, Mass, and Evidence for an Edge-on Disk"
- "Planet collision could explain alien world's heat"
