K2-18b

K2-18b

Impresia artistică a K2-18b (dreapta) care orbitează piticul roșu K2-18 (stânga). Candidatul exoplanet neconfirmat K2-18c este afișat între ei.
Descoperire[1]
Loc descoperireKepler
Dată descoperire2015
Metodă detectare
Tranzit
Caracteristicile orbitei[2]
0.1429+0.0060
−0.0065 ua
21.380.000 km
Excentricitate0.20±0.08
Perioadă orbitală
32.939623+0.000095
−0.000100 zi
Înclinație89.5785°+0.0079°
−0.0088°
−0.10+0.81
−0.59 rad
Semi-amplitudine3.55+0.57
−0.58 m/s
Caracteristici fizice
Raza medie
2.279±0.025 R⊕[3]
Masă8.63±1.35 M⊕[4]
Densitate medie
4.01 g/cm3
≤1.66 g
Temperatură265 ± 5 K (−8 ± −268 °C)[4]

K2-18 b, cunoscută și sub denumirea de EPIC 201912552 b, este o exoplanetă pe orbită în jurul piticii roșii K2-18, situată la aproximativ 124 de ani lumină (38 buc) de pe Pământ. Planeta, descoperită inițial de observatorul spațial Kepler, reprezintă de aproximativ opt ori masa Pământului și, prin urmare, este clasificată ca super-Pământ sau, mai probabil, mini-Neptun. Are o orbită de 33 de zile în zona locuibilă a stelei, dar este puțin probabil să fie locuibilă.

În 2019, două studii independente care combină datele de la telescopul spațial Kepler, telescopul spațial Spitzer și telescopul spațial Hubble, au concluzionat că în atmosfera sa sunt prezente cantități semnificative de vapori de apă, primul pentru o planetă din zona locuibilă.

Referințe

  1. ^ Montet, Benjamin T.; et al. (). „Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation”. The Astrophysical Journal. 809 (1): 25. arXiv:1503.07866 Accesibil gratuit. Bibcode:2015ApJ...809...25M. doi:10.1088/0004-637X/809/1/25. 
  2. ^ Sarkis, Paula; et al. (). „The CARMENES Search for Exoplanets around M Dwarfs: A Low-mass Planet in the Temperate Zone of the Nearby K2-18”. The Astronomical Journal. 155 (6): 257. arXiv:1805.00830 Accesibil gratuit. Bibcode:2018AJ....155..257S. doi:10.3847/1538-3881/aac108. 
  3. ^ Benneke, Björn; et al. (). „Spitzer Observations Confirm and Rescue the Habitable-zone Super-earth K2-18b for Future Characterization”. The Astrophysical Journal. 834 (2): 187. arXiv:1610.07249 Accesibil gratuit. Bibcode:2017ApJ...834..187B. doi:10.3847/1538-4357/834/2/187. 
  4. ^ a b Cloutier, R.; et al. (). „Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES”. Astronomy and Astrophysics. 621. A49. arXiv:1810.04731 Accesibil gratuit. Bibcode:2019A&A...621A..49C. doi:10.1051/0004-6361/201833995. 

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