User:21.Andromedae/Abandoned articles

=OGLE-2016-BLG-1928= OGLE-2016-BLG-1928 is a exoplanet candidate and a possible rogue planet located in the constellation Sagittarius. The planet was detected in 2020 through microlensing observations by the OGLE and KMT observatories. With a mass of 0.3 or $2 Earth mass$, OGLE-2016-BLG-1928 is one of the least massive planets discovered through microlensing.

Characteristics
OGLE-2016-BLG-1928 is possibly a free-floating planet, as no host star has been detected within 7 astronomical units of the planet. Assuming that it is located in the galactic disk, its mass is about 30% of Earth's mass, making it a sub-Earth planet. However, if it is actually located in the galactic bulge, its mass is considerably greater, about $2 Earth mass$.

For now, OGLE-2016-BLG-1928 is still a planetary candidate and it has not yet been confirmed.

Discovery
OGLE-2016-BLG-1928 was discovered through gravitational microlensing observed by the Optical Gravitational Lensing Experiment (OGLE), an astronomical survey led by the University of Warsaw, which currently operates on the 1.3-meter Warsaw Telescope located at Las Campanas Observatory, Chile.

Notes and references
=Gliese 341 b=

Gliese 341 b, also known as TOI-341 b, is a confirmed exoplanet orbiting Gliese 341, a red dwarf star located 33.9 light-years from Earth in the constellation Carina, visually close to the False Cross asterism. Having a radius of $0.92 Earth radius$ and an estimated mass of $0.72 Earth mass$, it is classified as a sub-Earth. It was discovered in 2024, after analysis of transit observations of the James Webb Space Telescope.

Characteristics
Gliese 341 b classifies as a sub-Earth planet, having a radius of about $7.756 day$ ($0.92 Earth radius$) and a mass estimated at $0.72 Earth mass$, according to mass-radius relationships, while the upper mass limit is $0.92 Earth radius$. The planet's equilibrium temperature is estimated at 560 K, while its irradiation temperature is 760 K.

Atmospheric composition
So far, it is not known whether TOI-741 b has an atmosphere. According to a transmission spectrum taken with the James Webb Space Telescope, scenarios such as a hazy atmosphere, an water-dominated atmosphere, or even no atmosphere are all plausible, while other scenarios such as an atmosphere with a high mean molecular weight are ruled out.

Discovery and observation
Gliese 341 b was discovered by a group of astronomers led by James Kirk. They observed three transits of the planet detected by the James Webb Space Telescope's Near Infrared Camera (NIRCam) instrument. The discovery was announced in January 2024.

Host star
The host star of Gliese 341 b is Gliese 341, a nearby red dwarf 34 light-years from Earth in the constellation Carina. The star is about 53% the size of the Sun and 57% its mass, and has an effective temperature of 3820 K. With an apparent magnitude of 9.5, it cannot be visible to the naked eye, but can be observed through a simple telescope.

The closest star to TOI-741 is the red dwarf L 140-289, located 2.5 light years away. The neighboring star L 98-59 has four confirmed exoplanets.

Notes and references


= Teegarden's star d =

Teegarden's star d, shortened to Teegarden d, is a confirmed exoplanet orbiting Teegarden's star. The planet was discovered in February 2024, via the radial velocity method, and was the third exoplanet discovered orbiting this star. The planet orbits is star at a distance of 0.0791 AU and is beyond the habitable zone of its star, having a planetary equilibrium temperature of 153 K, its surface resemble the icy moons of Jupiter, like Ganymede. Teegarden's star is one of the smallest known stars, and is barely larger than Jupiter. It is located 12.7 light-years from Earth and is one of the nearest stars.

=LHS 3154=

LHS 3154 is a red dwarf located about 50 light-years from Earth, in the constellation Hercules. Possessing about 1/9 (11%) the mass of the Sun, and 1/7 (14%) its radius, it is one of the smallest stars known, and is extremely faint to be seen with the naked eye, or even a simple telescope, with an apparent magnitude of 17.5.

In 2023, an exoplanet orbiting LHS 3154 was discovered using the radial velocity method. Named LHS 3154 b, it is a Neptune-mass planet with a minimum mass of 13.2 times that of Earth, which orbits at around 0.02 astronomical units and completes an orbit every 3 days and 17 hours.

=OGLE-2013-BLG-0132=

OGLE-2013-BLG-0132Lb is a Saturn-mass planet orbiting the star OGLE-2013-BLG-0132L. It has a measured mass of 0.26, being slightly less massive than Saturn, and is located at a distance of 3.14 astronomical units from its star. The planet was discovered in 2017, when Mróz et al. analysed a microlensing event that has been observed four years before, by the Optical Gravitational Lensing Experiment. Later, the microlensing event was observed again by Rektsini et al. in 2024. Its host star, OGLE-2013-BLG-0132, is a red dwarf that has a mass of 0.495, and is located about 11,300 light-years away in the constellation Sagittarius.

Physical characteristics
Initially, OGLE-2013-BLG-0132Lb had a estimated mass of $5,868 km$ ($0.72 Earth mass$, as estimated by Mróz et al in 2017. Then, Rektsini et al in 2020 measured the planet's mass more accurately, obtaining a mass of $4.5 Earth mass$. The projected separation of the planet, i.e the minimum distance from its star, is 3.14 AU.

The host star of OGLE-2013-BLG-0132Lb is OGLE-2013-BLG-0132L. It is a red dwarf star, based on its mass of $26.13 day$. The star and its planet are located in the constellation Sagittarius, more precisely in the astronomical coordinates 17:59:03.51, -28°25′15.7″, at a distance of $0.079 AU$ ($0.07$) from Earth.

Discovery and observation (incomplete)
The microlensing event was first observed in January discovered in March 3, 2013 by the OGLE, and independently found by MOA in March 13, 2023, recieving the designation MOA-2013-BLG-148.

Notes and references
= TOI-1710 b = TOI-1710 b is an confirmed exoplanet orbiting TOI-1710, a G-type star 264 light-years away in the constellation Cameloparadalis. It is classified as a warm super-Neptune planet, having a mass of 18.4 and a temperature of 730 K.