Wikipedia
WASP-25
WASP-25 is a yellow main sequence star in the constellation of Hydra.
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Hydra |
| Right ascension | 13h 01m 26.3760s[1] |
| Declination | −27° 31′ 19.9208″[1] |
| Apparent magnitude (V) | 11.87[2] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | G4[3] |
| B−V color index | 0.45 |
| J−H color index | 0.328[citation needed] |
| J−K color index | 0.422[citation needed] |
| Astrometry | |
| Radial velocity (Rv) | -2.698±0.0028[4] km/s |
| Proper motion (μ) | RA: -29.268±0.061[1] mas/yr Dec.: -6.293±0.047[1] mas/yr |
| Parallax (π) | 4.714 ± 0.0324 mas[1] |
| Distance | 692 ± 5 ly (212 ± 1 pc) |
| Details[3][5] | |
| Mass | 1.00±0.03 M☉ |
| Radius | 0.92 R☉ |
| Surface gravity (log g) | 4.50±0.15 cgs |
| Temperature | 5615±55 K |
| Metallicity [Fe/H] | -0.07±0.1 dex |
| Rotational velocity (v sin i) | 3.0±1 km/s |
| Age | 0.02+3.96 −0.01 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Star characteristics edit
WASP-25 is slightly metal-poor (85% of Solar amount) and is probably a young star which has just entered the main sequence.[3]
Planetary system edit
The "Hot Jupiter" class planet WASP-25b was discovered around WASP-25 in 2010.[3] The planet would have an equilibrium temperature of 1212±35 K. A Rossiter-McLaughlin effect based study in 2011 found a modest misalignment of the planetary orbit to the rotational axis of the parent star, equal to 14.6±6.7 degrees.[7] A habitability study in 2018 found WASP-25b does not adversely affect the stability of planetary orbits in the habitable zone of WASP-25.[8]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.58±0.04 MJ | 0.0474±0.0004 | 3.764825±0.000005 | 0 | 88.33±0.32° | 1.26+0.06 −0.05 RJ |
References edit
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ a b c d Enoch, B.; Cameron, A. Collier; Anderson, D. R.; Lister, T. A.; Hellier, C.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; West, R. G.; Brown, D. J. A.; Gillon, M.; Hebb, L.; Lendl, M.; Parley, N.; Pepe, F.; Pollacco, D.; Segransan, D.; Simpson, E.; Street, R. A.; Udry, S. (2010). "WASP-25b: A 0.6 MJ planet in the Southern hemisphere". Monthly Notices of the Royal Astronomical Society: no. arXiv:1009.5917. doi:10.1111/j.1365-2966.2010.17550.x. S2CID 6314762.
- ^ Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D.; Le Campion, J. -F.; Marchal, O.; Hestroffer, D.; Thévenin, F.; Crifo, F.; Udry, S.; Cropper, M.; Seabroke, G.; Viala, Y.; Benson, K.; Blomme, R.; Jean-Antoine, A.; Huckle, H.; Smith, M.; Baker, S. G.; Damerdji, Y.; Dolding, C.; Frémat, Y.; Gosset, E.; Guerrier, A.; Guy, L. P.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
- ^ Maxted, P. F. L., Koen, C., Smalley, B., 2011, MNRAS, 418, 1039
- ^ WASP-25 -- Star
- ^ Brown, D. J. A.; Cameron, A. Collier; Anderson, D. R.; Enoch, B.; Hellier, C.; Maxted, P. F. L.; Miller, G. R. M.; Pollacco, D.; Queloz, D.; Simpson, E.; Smalley, B.; Triaud, A. H. M. J.; Boisse, I.; Bouchy, F.; Gillon, M.; Hébrard, G. (2012). "Rossiter-Mc Laughlin effect measurements for WASP-16, WASP-25 and WASP-31★". Monthly Notices of the Royal Astronomical Society. 423 (2): 1503–1520. arXiv:1203.4971. Bibcode:2012MNRAS.423.1503B. doi:10.1111/j.1365-2966.2012.20973.x. S2CID 53445367.
- ^ Georgakarakos, Nikolaos; Eggl, Siegfried; Dobbs-Dixon, Ian (2018). "Giant Planets: Good Neighbors for Habitable Worlds?". The Astrophysical Journal. 856 (2): 155. arXiv:1804.02183. Bibcode:2018ApJ...856..155G. doi:10.3847/1538-4357/aaaf72. S2CID 119522834.
- ^ Planet WASP-25 b at exoplanet.eu
- ^ Southworth, John; Hinse, T. C.; Burgdorf, M.; Calchi Novati, S.; Dominik, M.; Galianni, P.; Gerner, T.; Giannini, E.; Gu, S.-H.; Hundertmark, M.; Jørgensen, U. G.; Juncher, D.; Kerins, E.; Mancini, L.; Rabus, M.; Ricci, D.; Schäfer, S.; Skottfelt, J.; Tregloan-Reed, J.; Wang, X.-B.; Wertz, O.; Alsubai, K. A.; Andersen, J. M.; Bozza, V.; Bramich, D. M.; Browne, P.; Ciceri, S.; d'Ago, G.; Damerdji, Y.; et al. (2014). "High-precision photometry by telescope defocussing – VI. WASP-24, WASP-25 and WASP-26★". Monthly Notices of the Royal Astronomical Society. 444 (1): 776–789. arXiv:1407.6253. Bibcode:2014MNRAS.444..776S. doi:10.1093/mnras/stu1492. S2CID 53641330.