GJ 1061
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GJ 1061 is a red dwarf star located Template:Convert from Earth in the southern constellation of Horologium. Even though it is a relatively nearby star, it has an apparent visual magnitude of about 13,[1] so it can only be seen with at least a moderately-sized telescope.
The proper motion of GJ 1061 has been known since 1974, but it was estimated to be further away: approximately Template:Convert distant based upon an estimated parallax of 0.130″. The RECONS accurately determined its distance in 1997. At that time, it was the 20th-nearest star system to the Sun. The discovery team noted that many more stars like this are likely to be discovered nearby.[1]
This star is a tiny, dim, red dwarf, close to the lower mass limit. It has an estimated mass of about 12.5% that of the Sun and is only about 0.2% as luminous.[2] The star displays no significant infrared excess due to circumstellar dust.[3]
Planetary system
On August 13, 2019, a planetary system was announced orbiting the star GJ 1061 by the Red Dots project for detecting terrestrial planets around nearby red dwarf stars.[4] The planet GJ 1061 d orbits in the conservative circumstellar habitable zone of its star and the planet GJ 1061 c orbits in the inner edge of the habitable zone.[4] GJ 1061 is a non-variable star that does not suffer flares, so there is a greater probability that the exoplanets still conserve their atmosphere if they had one.[5]
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GJ 1061 c
GJ 1061 c is a potentially habitable exoplanet orbiting within the limits of the optimistically defined habitable zone of its red dwarf parent star.[6][7][4]
GJ 1061 c is at least 74% more massive than the Earth. The planet receives 35% more stellar flux than Earth and has an equilibrium temperature of Template:Convert.[8] The average temperature on the surface would be warmer, Template:Convert, provided the atmosphere is of similar composition to the Earth's.
GJ 1061 c orbits its parent star very closely, every 6.7 days at a distance of just 0.035 au, so it is probably gravitationally locked and in synchronous rotation with its star.
GJ 1061 d
GJ 1061 d is a potentially habitable exoplanet largely orbiting within the limits of the conservatively defined habitable zone of its parent red dwarf star.[6][9][4]
The exoplanet is at least 64% more massive than the Earth. The planet receives about 40% less stellar flux than Earth and has an estimated equilibrium temperature of Template:Convert.[6][4] The average temperature on the surface would be colder than Earth's and at around Template:Convert, provided the atmosphere is similar to that of Earth.
GJ 1061 d orbits its star every 13 days, and due to its close-in semi-major axis, it is likely that the exoplanet is tidally locked.[10] However, if the planet's orbit is confirmed to be highly eccentric then this eccentricity could be desynchronising it, enabling the existence of non-synchronised states of equilibrium in its rotation, relative to which side of the planet is facing the star, and thereby it will experience a day/night cycle.[11]
Another solution for this planet gives it a slightly shorter period of 12.4 days and a slightly smaller minimum mass of Template:Earth mass.[4]
See also
- List of nearest stars and brown dwarfs
- Research Consortium On Nearby Stars
- List of exoplanets discovered in 2020 - GJ 1061 b, c, & d
Notes
References
External links
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