User:InTheAstronomy32/Abandoned articles

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OGLE-2016-BLG-1928[edit]

OGLE-2016-BLG-1928 is a exoplanet candidate and a possible rogue planet located in the constellation Sagittarius.[1] The planet was detected in 2020 through microlensing observations by the OGLE and KMT observatories.[2][3] With a mass of 0.3 or 2 M🜨, OGLE-2016-BLG-1928 is one of the least massive planets discovered through microlensing.[4]

OGLE-2016-BLG-1928
Artistic representation of an rogue planet.
Discovery
Discovery site Poland; University of Warsaw[3]
Discovery date2020
Microlensing[4]
Physical characteristics
Mass0.3 or 2 M🜨[4]

Characteristics[edit]

OGLE-2016-BLG-1928 is possibly a free-floating planet, as no host star has been detected within 7 astronomical units of the planet.[5] Assuming that it is located in the galactic disk, its mass is about 30% of Earth's mass, making it a sub-Earth planet.[2] However, if it is actually located in the galactic bulge, its mass is considerably greater, about 2 M🜨.[4]

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

Discovery[edit]

This is how the microlensing method works: when the planet is aligned with a background star and the observer, its gravity magnifies, distorts, and creates multiple images of the background star.[6] This method is quite useful for discovering planets that emit little or no radiation.

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.[7]

See also[edit]

Notes and references[edit]

  1. ^ Martin, Pierre-Yves (2023). "Planet OGLE-2016-BLG-1928". exoplanet.eu. Retrieved 2024-01-08.
  2. ^ a b Kohler, Sussana (November 20, 2020). "A Terrestrial-Mass Planet on the Run?". AAS Nova. Retrieved January 8, 2023.{{cite web}}: CS1 maint: url-status (link)
  3. ^ a b de Lazaro, Enrico (October 30, 2020). "Astronomers Discover Smallest Free-Floating Exoplanet Yet". SciNews. Retrieved January 8, 2024.
  4. ^ a b c d Mróz, Przemek; Poleski, Radosław; Gould, Andrew; Udalski, Andrzej; Sumi, Takahiro; and; Szymański, Michał K.; Soszyński, Igor; Pietrukowicz, Paweł; Kozłowski, Szymon; Skowron, Jan; Ulaczyk, Krzysztof; Collaboration), (OGLE; Albrow, Michael D.; Chung, Sun-Ju (October 2020). "A Terrestrial-mass Rogue Planet Candidate Detected in the Shortest-timescale Microlensing Event". The Astrophysical Journal Letters. 903 (1): L11. doi:10.3847/2041-8213/abbfad. ISSN 2041-8205.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  5. ^ Wall, Mike (November 4, 2020). "Tiny rogue planet is the smallest free-floating exoplanet candidate yet". space.com. Retrieved January 8, 2024.
  6. ^ "First 'Earth Without A Sun' Discovered: Thousands More To Be Revealed Soon". Big Think. 2020-11-09. Retrieved 2024-01-11.
  7. ^ "From Uniwersytet Warszawski (PL): "An Earth-sized rogue planet discovered in the Milky Way"". sciencesprings. October 29, 2020. Retrieved January 10, 2024.

Gliese 341 b[edit]

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[1][note 1], visually close to the False Cross asterism.[2] Having a radius of 0.92 R🜨 and an estimated mass of 0.72 M🜨, it is classified as a sub-Earth.[3] It was discovered in 2024, after analysis of transit observations of the James Webb Space Telescope.[3]

Gliese 341 b
Discovery[3]
Discovered byJames Kirk et al.
Discovery dateJanuary 11, 2024 (announced)
Transit
Designations
TOI-741 b, LHS 2128 b, CD-59 2351 b, HD 304636 b, HIP 45908 b, LFT 643 b, L 140-9 b, LTT 3453 b[4]
Orbital characteristics
7.756 d[3]
StarGliese 341
Physical characteristics
Mean radius
0.92±0.05 R🜨[3]
Mass0.72±0.14 M🜨[3]
Temperature560 K (287 °C) (equilibrium temperature), 760 K (487 °C) (iradiation temperature)[3]
  1. ^ Obtained with a right ascension of 09h 21m 38s and a declination of −60° 16′ 55″[2] on this website.

Characteristics[edit]

Gliese 341 b classifies as a sub-Earth planet, having a radius of about 0.92 R🜨 (5,868 km) and a mass estimated at 0.72 M🜨, according to mass-radius relationships, while the upper mass limit is 4.5 M🜨.[3] The planet's equilibrium temperature is estimated at 560 K (287 °C), while its irradiation temperature is 760 K (487 °C).[3]

Atmospheric composition[edit]

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.[3]

Discovery and observation[edit]

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.[3]

Host star[edit]

The host star of Gliese 341 b is Gliese 341, a nearby red dwarf 34 light-years from Earth in the constellation Carina.[4][a] The star is about 53% the size of the Sun and 57% its mass, and has an effective temperature of 3820 K.[4] With an apparent magnitude of 9.5, it cannot be visible to the naked eye, but can be observed through a simple telescope.[4]

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.[4]

Nearest stars to Gliese 341[4]
Name Distance
L 140-289 2.5
SCR J0838-5855 4.1
SCR J0821-6703 5.7
L 98-59 6.3
Gliese 367 9

See also[edit]

Notes and references[edit]

  1. ^ Martin, Pierre-Yves (2024). "Planet TOI-341 b". exoplanet.eu. Retrieved 2024-01-15.
  2. ^ a b "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2024-01-15.
  3. ^ a b c d e f g h i j k Kirk, James; Stevenson, Kevin B.; Fu, Guangwei; Lustig-Yaeger, Jacob; Moran, Sarah E.; Peacock, Sarah; Alam, Munazza K.; Batalha, Natasha E.; Bennett, Katherine A. (2024-01-11), JWST/NIRCam Transmission Spectroscopy of the Nearby Sub-Earth GJ 341b, doi:10.48550/arXiv.2401.06043, retrieved 2024-01-15
  4. ^ a b c d e f "★ Gliese 341". Stellar Catalog. Retrieved 2024-01-16.
  1. ^ Cite error: The named reference Constellation 1 was invoked but never defined (see the help page).


Teegarden's star d[edit]

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.[1] The planet orbits is star at a distance of 0.0791 astronomical units (11,830,000 km) and is beyond the habitable zone of its star, having a planetary equilibrium temperature of 153 K (−120 °C), its surface resemble the icy moons of Jupiter, like Ganymede.[2] Teegarden's star is one of the smallest known stars, and is barely larger than Jupiter.[1] It is located 12.7 light-years from Earth and is one of the nearest stars.

Teegarden's star d
Discovery
Discovered byDreizler et al.
Discovery dateFebruary 5, 2024
Radial velocity
Orbital characteristics
0.0791+0.0025
−0.0027 AU
Eccentricity0.07+0.1
−0.05
26.13+0.03
−0.04 d
Physical characteristics
Mass>0.82±0.17 M🜨
Temperature159±3 K
(−114±3 °C)
  1. ^ a b "Teegarden's d". exoplanet.eu. February 5, 2024. Archived from the original on February 5, 2024. Retrieved February 5, 2024.
  2. ^ Dreizler, S.; Luque, R.; Ribas, I.; Koseleva, V.; Ruh, H. L.; Nagel, E.; Pozuelos, F. J.; Zechmeister, M.; Reiners, A. (2024-02-01), Teegarden's Star revisited: A nearby planetary system with at least three planets, doi:10.48550/arXiv.2402.00923, retrieved 2024-02-05

LHS 3154[edit]

LHS 3154 is a red dwarf located about 50 light-years from Earth, in the constellation Hercules.[1] 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.[1]

In 2023, an exoplanet orbiting LHS 3154 was discovered using the radial velocity method.[2] 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.[2]

  1. ^ a b "★ LP 224-38". Stellar Catalog. Retrieved 2024-01-11.
  2. ^ a b Stefánsson, Guðmundur; Mahadevan, Suvrath; Miguel, Yamila; Robertson, Paul; Delamer, Megan; Kanodia, Shubham; Cañas, Caleb I.; Winn, Joshua N.; Ninan, Joe P.; Terrien, Ryan C.; Holcomb, Rae; Ford, Eric B.; Zawadzki, Brianna; Bowler, Brendan P.; Bender, Chad F. (2023-12-01). "A Neptune-mass exoplanet in close orbit around a very low-mass star challenges formation models". Science. 382: 1031–1035. doi:10.1126/science.abo0233. ISSN 0036-8075.

OGLE-2013-BLG-0132[edit]

OGLE-2013-BLG-0132Lb is a Saturn-mass planet orbiting the star OGLE-2013-BLG-0132L.[1][2] It has a measured mass of 0.26 MJ, being slightly less massive than Saturn, and is located at a distance of 3.14 astronomical units from its star.[1] 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.[2] Later, the microlensing event was observed again by Rektsini et al. in 2024.[1] Its host star, OGLE-2013-BLG-0132, is a red dwarf that has a mass of 0.495 M☉, and is located about 11,300 light-years away in the constellation Sagittarius.[1][note 1]

OGLE-2013-BLG-0132Lb
Discovery[2]
Discovered byPrzemek Mróz et al.
Discovery siteOGLE
Discovery dateNovember 3, 2017
Gravitational microlensing
Orbital characteristics[1]
3.14±0.28 AU
9.3 years [a]
Physical characteristics[1]
Mass0.26±0.028 MJ (82.6±8.9 M🜨)
  1. ^ Obtained with a right ascension of 17h 59m 03.51s and a declination of −28° 25′ 15.7″[1] on this website.

Physical characteristics[edit]

Initially, OGLE-2013-BLG-0132Lb had a estimated mass of 0.29+0.16
−0.13 MJ (92.2+50.8
−41.3 M🜨, as estimated by Mróz et al in 2017. [2]Then, Rektsini et al in 2020 measured the planet's mass more accurately, obtaining a mass of 0.26 MJ.[1] The projected separation of the planet, i.e the minimum distance from its star, is 3.14 astronomical units (470,000,000 km).[1]

The host star of OGLE-2013-BLG-0132Lb is OGLE-2013-BLG-0132L. It is a red dwarf star, based on its mass of 0.495±0.054 M☉.[1] The star and its planet are located in the constellation Sagittarius,[b] more precisely in the astronomical coordinates 17h 59m 03.51s, −28° 25′ 15.7″, at a distance of 11,340±1,170 ly (3,480±360 pc) from Earth.[1]

Discovery and observation (incomplete)[edit]

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[edit]

  1. ^ a b c d e f g h i j k Rektsini, Natalia E.; Batista, Virginie; Ranc, Clement; Bennett, David P.; Beaulieu, Jean-Philippe; Blackman, Joshua W.; Cole, Andrew A.; Terry, Sean K.; Koshimoto, Naoki (2024-01-30), Precise mass measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: a Saturn mass planet orbiting an M-dwarf, doi:10.48550/arXiv.2401.17549, retrieved 2024-02-01
  2. ^ a b c d Mróz, Przemek; Udalski, A.; Bond, I. A.; Skowron, J.; Sumi, T.; Han, C.; Szymański, M. K.; Soszyński, I.; Poleski, R.; Pietrukowicz, P.; Kozłowski, S.; Wyrzykowski, Ł.; Ulaczyk, K.; Abe, F.; Asakura, Y. (2017-11-01). "OGLE-2013-BLG-0132Lb and OGLE-2013-BLG-1721Lb: Two Saturn-mass Planets Discovered around M-dwarfs". The Astronomical Journal. 154 (5): 205. doi:10.3847/1538-3881/aa8f98. ISSN 0004-6256.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  1. ^ For a semi-major axis (mean distance from its star) of 3.6 astronomical units.
  2. ^ Based on the astronomical coordinates of the star in this website.

TOI-1710 b[edit]

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 ME and a temperature of 730 K (457 °C).[1]

TOI-1710 b
Discovery
Discovery date2020
transit
Orbital characteristics
0.164±0.004 AU
Eccentricity0.185+0.12
−0.091
24.283 d
Physical characteristics
Mean radius
5.15±0.12 R🜨
Mass18.4+4.8
−4.5 M🜨
Mean density
0.185+0.12
−0.091 g/cm3
Temperature730+36
−30 K (457 °C)

References[edit]

  1. ^ Orell-Miquel, J.; Carleo, I.; Murgas, F.; Nowak, G.; Palle, E.; Luque, R.; Masseron, T.; Sanz-Forcada, J.; Dragomir, D. (2024-01-24), Revisiting the warm sub-Saturn TOI-1710b, doi:10.48550/arXiv.2401.13574, retrieved 2024-01-29
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