TRAPPIST-1d

TRAPPIST-1d

Exoplanet		List of exoplanets
Artists Impression of a Rocky planet orbiting TRAPPIST-1
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)	0.08 (± 0.06)[1] AU
Eccentricity	(e)	0.0[1]
Orbital period	(P)	18.202 ( -14.0 +54.0 )[1] Juliean d
Inclination	(i)	89.87 (± 0.1)[1]°
Physical characteristics
Radius	(r)	0.1042 (± 0.0061) [1] RJ
Discovery information
Discovery date		May 2, 2016
Discoverer(s)
Discovery method		Transit
Discovery status		Published

TRAPPIST-1d is an exoplanet orbiting around the ultracool dwarf star TRAPPIST-1 approximatly 40 light-years in the constellation Aquarius.

Habitability

During formation of the system it is possible that water loss during pre-HZ periods occurred.^[3] TRAPPIST-1d may be the only exoplanet in the system to have kept enough water to remain habitable depending on its initial content. Its estimated that TRAPPIST-1b and TRAPPIST-1c may have lost up to four Earth Oceans.^[3]

Gallery

• 

  This picture shows the Sun and the ultracool dwarf star TRAPPIST-1 to scale. The faint star has only 11% of the diameter of the Sun and is much redder in colour.

• 

  This artist's impression shows an imagined view of the three planets orbiting an ultracool dwarf star.

• 

  This artist's impression shows an imagined view from the surface one of the three planets orbiting an ultracool dwarf star

• Play media

  This artist’s impression video shows an imagined view from close to one of the three planets orbiting an ultracool dwarf star just 40 light-years from Earth that were discovered using the TRAPPIST telescope at ESO’s La Silla Observatory. In this view one of the inner planets is seen in transit across the disc of its tiny and dim parent star. (4K Ultra HD Video)

References

1. "Planet TRAPPIST-1 d". 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). Bibcode:2006AJ....132.1234C. doi:10.1086/505706.
3. "Water loss from Earth-sized planets in the habitable zones of ultracool dwarfs: Implications for the planets of TRAPPIST-1". Emeline Bolmont, Franck Selsis, James E. Owen, Ignasi Ribas, Sean N. Raymond, Jérémy Leconte, Michael Gillon. Retrieved 2016-05-06.