TRAPPIST-1b

TRAPPIST-1b
Exoplanet List of exoplanets
Parent star
Star TRAPPIST-1[1]
Spectral type M8[1][2]:1236
Mass (m) 0.08 (± 0.009) (± 0.02)[1] M
Radius (r) 0.117 (± 0.004)[1] R
Temperature (T) 2550.0 (± 55.0)[1] K
Age 0.5[1] Gyr
Orbital elements
Semi-major axis(a) 0.01111 (± 0.0004)[1] AU
Eccentricity (e) 0.0[1]
Orbital period(P) 1.510848 (± 1.9e-05)[1] Juliean d
Inclination (i) 89.41 (± 0.41)[1]°
Physical characteristics
Radius(r)0.0993 (± 0.0039) [1] RJ
Discovery information
Discovery date May 2, 2016
Discoverer(s)
Discovery method Transit
Discovery status Published

TRAPPIST-1b is an exoplanet orbiting around the ultracool dwarf star TRAPPIST-1 approximately 40 light-years away in the constellation Aquarius.

Habitability

During formation of the system it is possible that water loss during pre-HZ periods occurred.[3] Its estimated that TRAPPIST-1b and TRAPPIST-1c may have lost up to four Earth Oceans possibly compromising its habitability, however TRAPPIST-1d may have been able to keep enough liquid water to sustain life.[3]

Spectrum of TRAPPIST-1 b and c

The combined transmission spectrum of TRAPPIST-1 b and c rules out a cloud-free hydrogen-dominated atmosphere for each planet, so they are unlikely to harbor an extended gas envelope. Other atmospheres, from a cloud-free water vapor atmosphere to a Venus-like atmosphere, remain consistent with the featureless spectrum.[4]

References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Planet TRAPPIST-1 b". Exoplanet.eu. Retrieved 2016-05-06.
  2. Costa, E.; Mendez, R.A.; Jao, W.-C.; Henry, T.J.; Subasavage, J.P.; Ianna, P.A. (August 4, 2006). "The Solar Neighborhood. XVI. Parallaxes from CTIOPI: Final Results from the 1.5 m Telescope Program" (PDF). The Astronomical Journal. The American Astronomical Society. 132 (3): 1234. Bibcode:2006AJ....132.1234C. doi:10.1086/505706.
  3. 1 2 Bolmont, Emeline; Selsis, Franck; Owen, James E.; Ribas, Ignasi; Raymond, Sean N.; Leconte, Jérémy; Gillon, Michael (2016). "Water loss from Earth-sized planets in the habitable zones of ultracool dwarfs: Implications for the planets of TRAPPIST-1". arXiv:1605.00616Freely accessible [astro-ph.EP].
  4. de Wit, Julien; et al. (2016). "A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c". Preprint. arXiv:1606.01103Freely accessible.
  5. "Artist's view of planets transiting red dwarf star in TRAPPIST-1 system". www.spacetelescope.org. Retrieved 21 July 2016.


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