Kepler-37

Kepler-37
Kepler-37
Comparação de tamanho dos planetas do sistema Kepler-37 com a Lua, Mercúrio, Marte e Terra.
Dados observacionais (J2000)
Constelação Lyra
Asc. reta 18h 56m 14.3078s[1]
Declinação 44° 31′ 05.389″[1]
Magnitude aparente 9.71[1]
Características
Tipo espectral G8V
Astrometria
Paralaxe 15,6155[1] mas ± 0,0290
Distância 208,9 anos-luz
64 pc
Detalhes
Massa 0,803[2] M
Raio 0,77[2] R
Temperatura 5417[2] K
Metalicidade -0,32[2] dex
Rotação 1,1[2] km/s
Idade 5 660 000 000[3] anos
Outras denominações
KOI-245, KIC 8478994, TYC 3131-1199-1, BD+44 3020, 2MASS J18561431+4431052, GSC 03131-01199, Gaia DR2 2106674071344722688

Kepler-37 é uma estrela do tipo espectral G da sequência principal localizada a cerca de 209 anos-luz da Terra na Constelação de Lyra.[2] Possui uma massa equivalente à 80,3% da massa solar, um raio equivalente à 77% do raio solar, e uma temperatura de 5417 K, pouco menor que a temperatura do Sol, de 5772 K.[2][4] Com uma idade de 5,66 bilhões de anos,[5] é mais velha que o Sol, que tem uma idade de 4,6 bilhões de anos[6][7].

Sistema planetário

O sistema é formado, além desta estrela, por quatro exoplanetas - Kepler-37b, Kepler-37c, Kepler-37d e Kepler-37e[8][3], descobertos em setembro de 2012 e anunciados em fevereiro de 2013[2].

Kepler-37b é o planeta mais próximo à Kepler-37, à uma distância de 0,1 UA. Também é o menor exoplaneta descoberto ao redor de uma estrela da sequência principal[9], com cerca de 4500 km de diâmetro, é comparável em tamanho à lua de Júpiter Calisto e ao planeta Mercúrio[10][11][12][13].

Kepler-37c possui três-quartos do diâmetro da Terra e completa uma órbita ao redor de sua estrela em aproximadamente 21 dias a uma distância de pouco menos de 0,14 UA.[2]

Kepler-37d possui cerca de duas vezes o diâmetro da Terra e completa uma órbita ao redor de sua estrela em cerca de 40 dias à uma distância de 0,21 UA.[9]

O sistema planetário Kepler-37[2]
Companheiro

(em ordem da estrela)

Massa

(MTerra)

Semieixo maior(UA) Período orbital

(dias)

Excentricidade Inclinação Raio(RTerra)
b 0,01 0,1003 13,367308 88,63º 0,354
c 0,1368 21,301886 89,07º 0,742
d 5,4±1,4[14] 0,2109 29,46 89,335º 1,99
e (disputado) 0,2508 51,196

Referências

  1. a b c d Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Bailer-Jones, C. A. L. (agosto de 2018). «Gaia Data Release 2. Summary of the contents and survey properties». Astronomy & Astrophysics: A1. ISSN 0004-6361. doi:10.1051/0004-6361/201833051. Consultado em 30 de janeiro de 2023 
  2. a b c d e f g h i j Barclay, Thomas; Rowe, Jason F.; Lissauer, Jack J.; Huber, Daniel; Fressin, Francois; Howell, Steve B.; Bryson, Stephen T.; Chaplin, William J.; Désert, Jean-Michel (28 de fevereiro de 2013). «A sub-Mercury-sized exoplanet». Nature (7438): 452–454. ISSN 0028-0836. doi:10.1038/nature11914. Consultado em 30 de janeiro de 2023 
  3. a b Smallest Alien Planet Kepler-37b Explained (Infographic)
  4. «Sun Fact Sheet». nssdc.gsfc.nasa.gov. Consultado em 30 de janeiro de 2023 
  5. published, Karl Tate (20 de fevereiro de 2013). «Smallest Alien Planet Kepler-37b Explained (Infographic)». Space.com (em inglês). Consultado em 30 de janeiro de 2023 
  6. Bonanno, A.; Schlattl, H.; Paterno`, L. (agosto de 2002). «The age of the Sun and the relativistic corrections in the EOS». Astronomy & Astrophysics (3): 1115–1118. ISSN 0004-6361. doi:10.1051/0004-6361:20020749. Consultado em 30 de janeiro de 2023 
  7. Connelly, James N.; Bizzarro, Martin; Krot, Alexander N.; Nordlund, Åke; Wielandt, Daniel; Ivanova, Marina A. (1 de novembro de 2012). «The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk». Science. 651 páginas. ISSN 0036-8075. doi:10.1126/science.1226919. Consultado em 30 de janeiro de 2023 
  8. ptjornal.com/ Arquivado em 1 de agosto de 2013, no Wayback Machine. NASA apresenta Kepler-37, o sistema planetário com uma estrela descoberto na constelação de Lira
  9. a b Griffin, Catherine (21 de fevereiro de 2013). «Tiniest Planet Yet Discovered by NASA Outside our Solar System». Science World Report. Consultado em 30 de janeiro de 2023 
  10. «Kepler: Discovery: Kepler-37b, a planet only slightly larger than the Moon». web.archive.org. 18 de dezembro de 2014. Consultado em 30 de janeiro de 2023 
  11. «The Extrasolar Planet Encyclopaedia — Kepler-37 b». exoplanet.eu. Consultado em 30 de janeiro de 2023 
  12. «Kepler-37 | NASA Exoplanet Archive». exoplanetarchive.ipac.caltech.edu. Consultado em 30 de janeiro de 2023 
  13. Marcy, Geoffrey W.; Isaacson, Howard; Howard, Andrew W.; Rowe, Jason F.; Jenkins, Jon M.; Bryson, Stephen T.; Latham, David W.; Howell, Steve B.; Gautier III, Thomas N. (13 de janeiro de 2014). «Masses, Radii, and Orbits of Small Kepler Planets: The Transition from Gaseous to Rocky Planets». The Astrophysical Journal Supplement Series (2). 20 páginas. ISSN 0067-0049. doi:10.1088/0067-0049/210/2/20. Consultado em 30 de janeiro de 2023 
  14. Rajpaul, V. M.; Buchhave, L. A.; Lacedelli, G.; Rice, K.; Mortier, A.; Malavolta, L.; Aigrain, S.; Borsato, L.; Mayo, A. W. (27 de agosto de 2021). «A HARPS-N mass for the elusive Kepler-37d: a case study in disentangling stellar activity and planetary signals». Monthly Notices of the Royal Astronomical Society (2): 1847–1868. ISSN 0035-8711. doi:10.1093/mnras/stab2192. Consultado em 30 de janeiro de 2023 

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