WASP-46

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WASP-46
Observation data
Epoch J2000       Equinox J2000
Constellation Indus [1]
Right ascension 21h 14m 56.85987s [2]
Declination −55° 52′ 18.4581″ [2]
Apparent magnitude  (V)12.9 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type G6V [3]
Astrometry
Radial velocity (Rv)−3.28±1.62 [2] km/s
Proper motion (μ)RA: +12.521 mas/yr [2]
Dec.: −16.150 mas/yr [2]
Parallax (π)2.6878±0.0131  mas [2]
Distance 1,213 ± 6  ly
(372 ± 2  pc)
Details [4]
Mass 0.828±0.067  M☉
Radius 0.858±0.024  R☉
Surface gravity (log g)4.489±0.013 [5]   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
TOI-101, TIC 231663901, WASP-46, GSC 08797-00758, 2MASS J21145687-5552184, DENIS J211456.8-555218 [6]
Database references
SIMBAD data
Exoplanet Archive data

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. [3] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet in a close orbit. [7]

The star displays excess ultraviolet emission associated with starspot activity, [8] and is suspected to be surrounded by a dust and debris disk. [9]

Planetary system

In 2011 a transiting hot superjovian planet, WASP-46b, was detected. [3] The planet's equilibrium temperature is 1,636±44  K . [5] The dayside temperature measured in 2014 is much higher at 2,386 K, indicating a very poor heat redistribution across the planet. [10] A re-measurement of the dayside planetary temperature in 2020 resulted in a lower value of 1,870+130
−120 K. [11]

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. [12]

The WASP-46 planetary system [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b1.91±0.11  MJ 0.02335±0.000631.43036763(93)<0.022 [4] 82.80±0.17 ° 1.174±0.033  RJ

References

  1. ↑ 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.
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 3 4 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
  4. 1 2 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.
  5. 1 2 3 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
  6. ↑ "WASP-46". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2 November 2023.
  7. ↑ 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
  8. ↑ 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
  9. ↑ 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
  10. ↑ 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
  11. ↑ 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
  12. ↑ 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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