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WASP-46 
Summary
WASP-46 is a G-type main-sequence star about 1,210 light-years (370 parsecs) away. The star is older than the Sun and is strongly depleted in heavy elements compared to the Sun, having just 45% of the solar abundance.[2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus |
| Right ascension | 21h 14m 56.85987s[1] |
| Declination | −55° 52′ 18.4581″[1] |
| Apparent magnitude (V) | 12.9[2] |
| Characteristics | |
| Spectral type | G6V[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.28±1.62[1] km/s |
| Proper motion (μ) | RA: 12.521 mas/yr[1] Dec.: -16.150 mas/yr[1] |
| Parallax (π) | 2.6878 ± 0.0131 mas[1] |
| Distance | 1,213 ± 6 ly (372 ± 2 pc) |
| Details[3] | |
| Mass | 0.828±0.067 M☉ |
| Radius | 0.858±0.024 R☉ |
| Surface gravity (log g) | 4.489±0.013[4] cgs |
| Temperature | 5600±150 K |
| Metallicity [Fe/H] | −0.37±0.13 dex |
| Rotation | 16.0±1.0 d |
| Rotational velocity (v sin i) | 1.9±1.2 km/s |
| Age | 9.6+3.4 −4.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star displays an excess ultraviolet emission associated with starspot activity,[7] and is suspected to be surrounded by a dust and debris disk.[8]
Planetary system edit
In 2011 a transiting hot superjovian planet, WASP-46b, was detected.[2] The planet's equilibrium temperature is 1636±44 K.[4] The dayside temperature measured in 2014 is much higher at 2386 K, indicating a very poor heat redistribution across the planet.[9] A re-measurement of the dayside planetary temperature in 2020 resulted in a lower value of 1870+130
−120 K.[10]
In 2017, a search for transit-timing variations of WASP-46b yielded zero results, thus ruling out existence of additional gas giants in the system. The orbital decay of WASP-46b was also not detected.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.91±0.11 MJ | 0.02335±0.00063 | 1.43036763(93) | <0.022[3] | 82.80±0.17° | 1.174±0.033 RJ |
References edit
- ^ a b c d e 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 c d Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Smith, A. M. S.; Triaud, A. H. M. J.; West, R. G.; Pepe, F.; Pollacco, D.; Ségransan, D.; Todd, I.; Udry, S. (2012), "WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets", Monthly Notices of the Royal Astronomical Society, 422 (3): 1988–1998, arXiv:1105.3179, Bibcode:2012MNRAS.422.1988A, doi:10.1111/j.1365-2966.2012.20635.x, S2CID 34406657
- ^ a b 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 Ciceri, S.; Mancini, L.; Southworth, J.; Lendl, M.; Tregloan-Reed, J.; Brahm, R.; Chen, G.; d'Ago, G.; Dominik, M.; Figuera Jaimes, R.; Galianni, P.; Harpsøe, K.; Hinse, T. C.; Jørgensen, U. G.; Juncher, D.; Korhonen, H.; Liebig, C.; Rabus, M.; Bonomo, A. S.; Bott, K.; Henning, Th.; Jordán, A.; Sozzetti, A.; Alsubai, K. A.; Andersen, J. M.; Bajek, D.; Bozza, V.; Bramich, D. M.; Browne, P.; et al. (2016), "Physical properties of the planetary systems WASP-45 and WASP-46 from simultaneous multi-band photometry", Monthly Notices of the Royal Astronomical Society, 456 (1): 990–1002, arXiv:1511.05171, Bibcode:2016MNRAS.456..990C, doi:10.1093/mnras/stv2698, S2CID 14670311
- ^ "WASP-46". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 November 2023.
- ^ 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
- ^ Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal, 766 (1): 9, arXiv:1301.6192, Bibcode:2013ApJ...766....9S, doi:10.1088/0004-637X/766/1/9, S2CID 118415788
- ^ Ribas, Á.; Merín, B.; Ardila, D. R.; Bouy, H. (2012), "Warm Debris Disks Candidates in Transiting Planets Systems", Astronomy & Astrophysics, 541: A38, arXiv:1203.0013, Bibcode:2012A&A...541A..38R, doi:10.1051/0004-6361/201118306, S2CID 29380547
- ^ Chen, G.; Van Boekel, R.; Wang, H.; Nikolov, N.; Seemann, U.; Henning, Th. (2014), "Observed spectral energy distribution of the thermal emission from the dayside of WASP-46b", Astronomy & Astrophysics, 567: A8, arXiv:1405.7048, doi:10.1051/0004-6361/201423795, S2CID 119187817
- ^ Wong, Ian; Shporer, Avi; Daylan, Tansu; Benneke, Björn; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Winn, Joshua N.; Jenkins, Jon M.; Boyd, Patricia T.; Glidden, Ana; Goeke, Robert F.; Sha, Lizhou; Ting, Eric B.; Yahalomi, Daniel (2020), "Systematic phase curve study of known transiting systems from year one of the TESS mission", The Astronomical Journal, 160 (4): 155, arXiv:2003.06407, Bibcode:2020AJ....160..155W, doi:10.3847/1538-3881/ababad, S2CID 212717799
- ^ Petrucci, R.; Jofré, E.; Ferrero, L. V.; Cúneo, V.; Saker, L.; Lovos, F.; Gómez, M.; Mauas, P. (2018), "A search for transit timing variations and orbital decay in WASP-46b", Monthly Notices of the Royal Astronomical Society, 473 (4): 5126–5141, arXiv:1710.04707, Bibcode:2018MNRAS.473.5126P, doi:10.1093/mnras/stx2647, S2CID 54509070