WASP-50b Source: en.wikipedia.org/wiki/WASP-50b
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 02h 54m 45.1342s[2] |
| Declination | −10° 53′ 53.025″[2] |
| Apparent magnitude (V) | 11.44[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G9V[4] |
| Astrometry | |
| Radial velocity (Rv) | 25.76±0.69[2] km/s |
| Proper motion (μ) | RA: 3.383(20) mas/yr[2] Dec.: 8.913(17) mas/yr[2] |
| Parallax (π) | 5.4865±0.0174 mas[2] |
| Distance | 594 ± 2 ly (182.3 ± 0.6 pc) |
| Details | |
| Mass | 0.892+0.08 −0.074[5] M☉ |
| Radius | 0.843±0.031[5] R☉ |
| Luminosity | 0.6[6] L☉ |
| Surface gravity (log g) | 4.5±0.1[4] cgs |
| Temperature | 5,400±100[4] K |
| Metallicity | −0.12±0.08[4] |
| Rotation | 16.30±0.50 d[7] |
| Rotational velocity (v sin i) | 2.6±0.5[4] km/s |
| Age | 8.57±2.86[7] Gyr |
| Other designations | |
| Chaophraya, TOI-391, TIC 382391899, WASP-50, TYC 5290-462-1, GSC 05290-00462, 2MASS J02544513-1053530[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-50, also named Chaophraya, is a G-type main-sequence star about 594 light-years away in the constellation Eridanus. The star is older than the Sun and slightly depleted in heavy elements compared to the Sun, and has a close to average starspot activity.[4] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit.[7]
Nomenclature
[edit]The designation WASP-50 comes from Wide Angle Search for Planets, a consortium of academic organisations detecting exoplanets using the transit method.
This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to Thailand. The approved names were Chaophraya for the star and Maeping for the planet, after the Chao Phraya and Mae Ping rivers in Thailand.[8][9]
Planetary system
[edit]In 2011 a transiting hot superjovian planet, WASP-50b (named Maeping in 2019[8]) was detected.[4] In 2022 its albedo was found to be no more than 0.44, meaning that the planet reflects less than 44% of the light irradiated by its host star. This allows the planetary equilibrium temperature to be constrained at 1393±42 K.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Maeping | 1.437±0.068 MJ | 0.0293±0.0013 | 1.955100±0.000005 | 0.009+0.011 −0.006[12] |
84.88±0.27° | 1.138±0.026 RJ |
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b "WASP-50". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ a b c d e f g Gillon, M.; Doyle, A. P.; Lendl, M.; Maxted, P. F. L.; Triaud, A. H. M. J.; Anderson, D. R.; Barros, S. C. C.; Bento, J.; Collier-Cameron, A.; Enoch, B.; Faedi, F.; Hellier, C.; Jehin, E.; Magain, P.; Montalban, J.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B.; Segransan, D.; Smith, A. M. S.; Southworth, J.; Udry, S.; West, R. G.; Wheatley, P. J. (2011), "WASP-50 b: a hot Jupiter transiting a moderately active solar-type star", Astronomy & Astrophysics, 533: A88, arXiv:1108.2641, Bibcode:2011A&A...533A..88G, doi:10.1051/0004-6361/201117198, S2CID 46639973
- ^ a b c Chakrabarty, Aritra; Sengupta, Sujan (2019), "Precise Photometric Transit Follow-up Observations of Five Close-in Exoplanets: Update on Their Physical Properties", The Astronomical Journal, 158 (1): 39, arXiv:1905.11258, Bibcode:2019AJ....158...39C, doi:10.3847/1538-3881/ab24dd, S2CID 166227769
- ^ Johns, Daniel; Marti, Connor; Huff, Madison; McCann, Jacob; Wittenmyer, Robert A.; Horner, Jonathan; Wright, Duncan J. (2018). "Revised Exoplanet Radii and Habitability Using Gaia Data Release 2". The Astrophysical Journal Supplement Series. 239 (1): 14. arXiv:1808.04533. Bibcode:2018ApJS..239...14J. doi:10.3847/1538-4365/aae5fb.
- ^ a b c Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics, 577: A90, arXiv:1503.09111, Bibcode:2015A&A...577A..90M, doi:10.1051/0004-6361/201525774, S2CID 53324330
- ^ a b "Two celestial objects named Chao Phraya and Maeping". nationthailand.com. 19 December 2019. Retrieved 2020-07-30.
- ^ "Approved names". NameExoWorlds. IAU. Retrieved 24 June 2025.
- ^ Blažek, Martin; Kabáth, Petr; Piette, Anjali A A; Madhusudhan, Nikku; Skarka, Marek; Šubjak, Ján; Anderson, David R; Boffin, Henri M J; Cáceres, Claudio C; Gibson, Neale P; Hoyer, Sergio; Ivanov, Valentin D; Rojo, Patricio M (2022-04-09). "Constraints on TESS albedos for five hot Jupiters". Monthly Notices of the Royal Astronomical Society. 513 (3): 3444–3457. arXiv:2204.03327. doi:10.1093/mnras/stac992. ISSN 0035-8711.
- ^ Tregloan-Reed, Jeremy; Southworth, John (2012), "An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system", Monthly Notices of the Royal Astronomical Society, 431: 966–971, arXiv:1212.0686, Bibcode:2013MNRAS.431..966T, doi:10.1093/mnras/stt227, S2CID 118869498
- ^ Knudstrup, E.; Albrecht, S. H.; et al. (October 2024). "Obliquities of exoplanet host stars: Nineteen new and updated measurements, and trends in the sample of 205 measurements". Astronomy & Astrophysics. 690: A379. arXiv:2408.09793. Bibcode:2024A&A...690A.379K. doi:10.1051/0004-6361/202450627.
