Vergelijking van het planetenstelsel L 98-59 met het binnenste deel van ons zonnestelsel
Deze infographic toont een vergelijking tussen het exoplanetenstelsel L 98-59 (bovenaan) en de binnenste planeten van ons zonnestelsel – Mercurius, Venus en de aarde – waarbij de overeenkomsten worden benadrukt.
L 98-59 bevat zeker vier rotsachtige planeten (in kleur afgebeeld in het bovenste paneel), die om een rode dwergster draaien die 35 lichtjaar van ons verwijderd is. De planeet die het dichtst bij de ster staat is ongeveer half zo zwaar als Venus, en is daarmee de lichtste exoplaneet die ooit met behulp van de radiale-snelheidstechniek is ontdekt. De derde planeet zou voor dertig procent uit water kunnen bestaan, waarmee het een oceaanwereld zou zijn. Het bestaan van de vierde planeet is bevestigd, maar wetenschappers weten nog niet wat zijn massa en straal is (zijn mogelijke grootte is aangegeven met een stippellijn). Het team heeft ook aanwijzingen gevonden voor een mogelijke vijfde planeet – de planeet die het verst van de ster staat – maar daar is nog weinig over bekend. Indien bevestigd, zou deze planeet zich in de leefbare zone van het stelsel bevinden, waar vloeibaar water op zijn oppervlak zou kunnen voorkomen.
De onderlinge afstanden in de infographic zijn niet op schaal weergegeven. Het diagram is zo geschaald dat de leefbare zones van het zonnestelsel en L 98-59 samenvallen. De infographic is voorzien van een een temperatuurschaal (in kelvin [K]), waaruit blijkt dat de aarde en de vijfde (onbevestigde) planeet in L 98-59 vergelijkbare hoeveelheden licht en warmte van hun respectievelijke sterren ontvangen. Ervan uitgaande dat ook hun atmosferen vergelijkbaar zijn, zou deze vijfde planeet ongeveer net zo warm zijn als de aarde en vloeibaar water op zijn oppervlak kunnen hebben.
Credit:ESO/L. Calçada/M. Kornmesser (Acknowledgment: O. Demangeon)
Over de afbeelding
| Id: | eso2112b |
| Taal: | nl-be |
| Type: | Collage |
| Publicatiedatum: | 5 augustus 2021 14:00 |
| Gerelateerde berichten: | eso2112 |
| Grootte: | 5500 x 3000 px |
Over het object
| Naam: | Exoplanets |
| Type: | Milky Way : Star : Circumstellar Material : Planetary System |
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