PSR B1620-26 b Planeetan kehitys | Lähteet | NavigointivalikkoInfobox OKPrimeval Planet: Oldest Known World Conjures Prospect of Ancient Lifelaajentamalla

EksoplaneetatSkorpionin tähdistöJättiläisplaneetat


eksoplaneettapulsariaPSR B1620-26SkorpioninMaastaMetusalahpallomaisen tähtijoukkoMessier 4neutronitähdeksisupernovaräjähdyksessävalkoinen kääpiötähtienvälinen planeetta



































PSR B1620-26 b
Artist's impression of pulsar planet B1620-26c.jpg
Löytäminen
Löytäjä(t)
Donald Backer
Löytöpäivä
30. toukokuuta 1993 (varmistettu 10. heinäkuuta 2003)
Tähden ominaisuudet
Tähden nimi
PSR B1620-26
Tähden etäisyys Auringosta

12 400 valovuotta
Tähden massa
1,35 MO
Tähden spektriluokka

pulsari
Tähden ikä
13 miljardia vuotta
Kiertoradan ominaisuudet
Isoakselin puolikas
23 AU
Kiertoaika
~100 v (36,525 vrk)
Inklinaatio
55°
Fyysiset ominaisuudet
Massa
2,5 ± 1[1]MJ
Säde
~0,8 RJ
Infobox OK

PSR B1620-26 b on eksoplaneetta, joka kiertää pulsaria PSR B1620-26 Skorpionin tähdistössä noin 12 400 valovuoden päässä Maasta. Sen epävirallinen lempinimi on Metusalah, koska se on yksi vanhimmista tunnetuista eksoplaneetoista eli noin 12,7 miljardia vuotta vanha.



Planeetan kehitys |


Pulsari sijaitsee pallomaisen tähtijoukko Messier 4:sen ytimen ulkopuolella. Tähtijoukon iäksi arvioidaan 12,7 miljardia vuotta. Pulsariplaneetan alkuperä on epävarma, koska tähden ytimen romahtaessa neutronitähdeksi se syöksee suurimman osan massastaan avaruuteen supernovaräjähdyksessä. On epätodennäköistä, että planeetta voisi pysyä kiertoradallaan tällaisessa tilanteessa. Tähtitieteilijät pitävät todennäköisempänä, että se muodostui tähden ympärille, josta myöhemmin tuli valkoinen kääpiö. Molemmat joutuivat sitten pulsarin kiertoradalle.[1]


Järjestelmä, joka liikkuu hitaasti kohti tähtijoukon ydintä, on massiivisempi kuin useimmat tähdet M4:ssa. Noin miljardin vuoden kuluessa PSR B1620-26 joutuu todennäköisesti kosketuksiin jonkin toisen tähden kanssa, jolloin kevein taivaankappale sinkoutuu pois järjestelmästä. PSR B1620-26 b joutuu tällöin suurella todennäköisyydellä kokonaan M4:sen ulkopuolelle, jolloin siitä tulee tähtienvälinen planeetta.



Lähteet |



  1. ↑ ab Robert Roy Britt: Primeval Planet: Oldest Known World Conjures Prospect of Ancient Life 10.7.2003. Space.com. Viitattu 8.11.2008. (englanniksi)




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