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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 | |
| 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 | |
| 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