Sammenligning af exoplanetsystemet L 98-59 med Solsystemet
Infogrammet her viser en sammenligning imellem exoplanetsystemet L 98-59 øverst og det indre af Solsystemet med Merkur, Venus og Jorden, så man kan se lighederne.
L 98-59 indeholder fire bekræftede klippeplaneter (farvede i den øverste del), som kredser om en rød dværgstjerne 35 lysår borte. Den planet, som er tættest ved stjernen vejer omkring halvdelen af Venus, så det er den letteste exoplanet, som til nu er fundet ved hjælp af radialhastighedsmetoden. Op imod 30% af den tredje planets masse kan være vand, så det er en "vandplanet". At den fjerde planet eksisterer er bekræftet, men endu kender forskerne ikke dens masse og radius (den punkterede linie viser dens mulige størrelse). Desuden fandt forskerne antydning af, at der findes en femte planet længst væk fra stjernen, men de har ikke megen viden om den. Hvis den bliver bekræftet, vil man se, at den befinder sig i stystemets beboelige zone, hvor der kan eksistere flydende vand på overfladen.
Afstandene fra stjernerne og planeterne imellem i infogrammet er ikke i korrekt skala. Diagrammet er justeret, så den beboelige zone for Solsystemet og for L 98-59 passer til hinanden. Som det kan ses af temperaturskalaen (i Kelvin) modtager Jorden og den femte ubekræftede planet i L 98-59 lige meget lys og varme fra deres respektive stjerner. Hvis vi antager, at de to atmosfærer er ens, vil denne femte planet have samme gennemsnitstemperatur som Jorden, og dermed vil der kunne findes flydende vand på overfladen.
Kilde:ESO/L. Calçada/M. Kornmesser (Acknowledgment: O. Demangeon)
Om billedet
| Id: | eso2112b |
| Sprog: | da |
| Type: | Kollage |
| Udgivelsesdato: | 5. august 2021 14:00 |
| Relaterede pressemeddelelser: | eso2112 |
| Størrelse: | 5500 x 3000 px |
Om objektet
| Navn: | Exoplanets |
| Type: | Milky Way : Star : Circumstellar Material : Planetary System |
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