WASP-46
WASP-46 is a G-type main-sequence star about 1240 light-years away. The star is older than Sun and is strongly depleted in heavy elements compared to Sun, having just 45% of solar abundance.[2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by giant planet on close orbit.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus |
| Right ascension | 21h 14m 56.8596s[1] |
| Declination | −55° 52′ 18.4600″[1] |
| Apparent magnitude (V) | 12.9 |
| Characteristics | |
| Spectral type | G6V |
| Astrometry | |
| Radial velocity (Rv) | -2.81 km/s |
| Proper motion (μ) | RA: 12.641 mas/yr Dec.: -16.011 mas/yr |
| Parallax (π) | 2.636 ± 0.0311[1] mas |
| Distance | 1,240 ± 10 ly (379 ± 4 pc) |
| Details[2][3] | |
| Mass | 0.956±0.034 M☉ |
| Radius | 0.917±0.028 R☉ |
| Surface gravity (log g) | 4.493±0.023 cgs |
| Temperature | 5600±150 K |
| Metallicity | −0.37±0.13 |
| 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 is displaying an excess ultraviolet emission associated with starspot activity,[5] and suspected to be surrounded by dust and debris disk.[6]
Planetary system
In 2011 a transiting hot superjovian planet b was detected.[2] The planet equilibrium temperature is 1636±44 K.[3] The measured dayside temperature is much higher at 2386 K, indicating a very poor heat redistribution across planet.[7]
In 2017, a search for transit-timing variation 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.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.91+0.11 −0.06 MJ |
0.02335±0.00063 | 1.4303700±0.0000023 | 0 | 82.63±0.38° | 1.174+0.033 −0.0017 RJ |
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References
- WASP-46 -- Star
- 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
- 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
- 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
- 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
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