WASP-17, also named Dìwö, is an F-type main sequence star approximately 1,310 light-years away in the constellation Scorpius.[2] It hosts the planet WASP-17b.[4][8]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius[1] |
| Right ascension | 15h 59m 50.9492s[2] |
| Declination | −28° 03′ 42.313″[2] |
| Apparent magnitude (V) | 11.500[3] |
| Characteristics | |
| Spectral type | F6V[4] |
| Astrometry | |
| Radial velocity (Rv) | −48.34±1.07[2] km/s |
| Proper motion (μ) | RA: −8.263(29) mas/yr[2] Dec.: −9.427(22) mas/yr[2] |
| Parallax (π) | 2.4811±0.0255 mas[2] |
| Distance | 1,310 ± 10 ly (403 ± 4 pc) |
| Details | |
| Mass | 1.306±0.026[5] M☉ |
| Radius | 1.572±0.056[5] R☉ |
| Surface gravity (log g) | 4.14 ± 0.03[6] cgs |
| Temperature | 6509 ± 86[6] K |
| Metallicity [Fe/H] | –0.02 ± 0.09[6] dex |
| Rotational velocity (v sin i) | 10.6 ± 1.3[6] km/s |
| Age | 2.65±0.25[5] Gyr |
| Other designations | |
| Dìwö, CD−27 10695, TOI-1050, TIC 66818296, WASP-17, TYC 6787-1927-1, 2MASS J15595095-2803422, 1SWASP J155950.94−280342.3[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The star, although similar to the Sun in terms of overall contents of heavy elements, is depleted of carbon. The carbon to oxygen molar ratio of 0.18±0.04 for WASP-17 is well below the solar ratio of 0.55.[9]
Nomenclature
editThe planet was discovered by the SuperWASP project, hence the name WASP-17.
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 Costa Rica. WASP-17 is named Dìwö, which in the Bribri language means the Sun, and its planet is named Ditsö̀.[10][11]
Planetary system
editAs of 2009, an exoplanet has been confirmed to orbit the star. The planet, WASP-17b, is unusual in that it is believed to orbit in the opposite direction to the star's spin (a retrograde orbit), and is twice the size of Jupiter, but half its mass.[12][13] The planet is also named Ditsö̀. It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Ditsö̀ | 0.512±0.037 MJ | 0.05151±0.00035 | 3.7354845(19) | <0.020 | 86.83+0.68 −0.53° |
1.991±0.081 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.
- ^ Maxted, P. F. L.; et al. (2011). "UBV(RI)C photometry of transiting planet hosting stars". Monthly Notices of the Royal Astronomical Society. 418 (2): 1039–1042. arXiv:1108.0349. Bibcode:2011MNRAS.418.1039M. doi:10.1111/j.1365-2966.2011.19554.x. S2CID 117056033.
- ^ a b Anderson, D. R.; et al. (2010). "WASP-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit". The Astrophysical Journal. 709 (1): 159–167. arXiv:0908.1553. Bibcode:2010ApJ...709..159A. doi:10.1088/0004-637X/709/1/159. S2CID 53628741.
- ^ a b c d Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
- ^ a b c d Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
- ^ "WASP-17". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ "Newfound Planet Orbits Backward". Space.com. 12 August 2009.
- ^ Polanski, Alex S.; Crossfield, Ian J. M.; Howard, Andrew W.; Isaacson, Howard; Rice, Malena (2022), "Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec", Research Notes of the American Astronomical Society, 6 (8): 155, arXiv:2207.13662, Bibcode:2022RNAAS...6..155P, doi:10.3847/2515-5172/ac8676
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Archived from the original on 2022-12-05. Retrieved 2020-01-02.
- ^ "New exoplanet orbits 'backwards'". August 12, 2009 – via news.bbc.co.uk.
- ^ "New-found Planet Orbits Backward".
- ^ D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", 2011