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]
| Discovery[2] | |
|---|---|
| Discovered by | Przemek Mróz et al. |
| Discovery site | OGLE |
| Discovery date | November 3, 2017 |
| Gravitational microlensing | |
| Orbital characteristics[1] | |
| 3.14±0.28 AU | |
| 9.3 years [a] | |
| Physical characteristics[1] | |
| Mass | 0.26±0.028 MJ (82.6±8.9 M🜨) |
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
- ^ 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
- ^ 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)
- ^ For a semi-major axis (mean distance from its star) of 3.6 astronomical units.
- ^ Based on the astronomical coordinates of the star in this website.
Wolf 327 b edit
Wolf 327 b is a confirmed extrasolar planet, an exoplanet orbiting the red dwarf Wolf 327, a red dwarf located 93 light-years away in the constellation Leo Minor.[1] It is a super-Earth, a type of exoplanet larger than Earth, having a mass of 2.53 ME and a radius of 1.23 R🜨.[1] It is also an ultra-short period planet, completing one orbit around its star every 13 hours and 18 minutes (0.573 days) in a small distance of 0.01 astronomical units (1,500,000 km) from its star.[1] The planet is subject to planetary insolation 233 times more intense than what the Earth recieves from the Sun and has a equilibrium temperature of 996 K (723 °C).[1]
| Discovery | |
|---|---|
| Discovered by | Murgas et al. |
| Discovery date | 21 January 2024 (announced) |
| transit | |
| Orbital characteristics | |
| 0.01±0.0004 AU | |
| Inclination | 84.89°+0.41° −0.38° |
| Physical characteristics | |
Mean radius | 1.24±0.06 R🜨 |
| Mass | 2.53±0.46 M🜨 |
Mean density | 7.24±1.66 g/cm3 |
| Temperature | Teq: 996±22 K |
Characteristics edit
Completing an orbit around its star every 13 hours and 18 minutes, Wolf 327 b classifies as an ultra-short period planet, a class of planets with orbital periods shorter than a day, which are quite unusual[1]. Located 0.01 astronomical units (1,500,000 km) from its star (one hundredth of the Earth-Sun distance), the planet is exposed to insolation 233.9 times more intense than what the Earth receives from the Sun, and has an equilibrium temperature of 996 K (723 °C).
Wolf 327 b has a radius of 1.24 R🜨 and a mass of 2.53 ME, being classified as a super-Earth, a class of planets that are larger than Earth, but smaller than the Solar System's ice giants, Neptune and Uranus. The planet's bulk density is 7.24 g/cm3, which is 30% greater than Earth's density, suggesting a rocky composition. According to theoretical models, Wolf 327 b has a large iron core, a small rocky mantle and a negligible or non-existent atmosphere.
The radius and mass of this planet are similar to that of K2-229b.
Host star edit
Wolf 327 is a red dwarf located about 93 light-years from Earth, in the constellation Leo Minor. The star has a radius and mass equivalent to about 2/5 that of the Sun, a temperature of 3,542 K (3,269 °C), and a luminosity equivalent to 2.3% of the solar luminosity. With an apparent magnitude of 12.98, the star is very faint and cannot be visible to the naked eye.
Notes and references edit
- ^ a b c d e Murgas, F.; Pallé, E.; Orell-Miquel, J.; Carleo, I.; Peña-Moñino, L.; Pérez-Torres, M.; Watkins, C. N.; Jeffers, S. V.; Azzaro, M. (2024-01-22), Wolf 327b: A new member of the pack of ultra-short-period super-Earths around M dwarfs, doi:10.48550/arXiv.2401.12150, retrieved 2024-01-30
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]
| Discovery | |
|---|---|
| Discovery date | 2020 |
| transit | |
| Orbital characteristics | |
| 0.164±0.004 AU | |
| Eccentricity | 0.185+0.12 −0.091 |
| 24.283 d | |
| Physical characteristics | |
Mean radius | 5.15±0.12 R🜨 |
| Mass | 18.4+4.8 −4.5 M🜨 |
Mean density | 0.185+0.12 −0.091 g/cm3 |
| Temperature | 730+36 −30 K (457 °C) |
References edit
- ^ 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