Astronomy:WASP-46

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Short description: Star in the constellation Indus
WASP-46
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: -16.150[1] mas/yr
Parallax (π)2.6878 ± 0.0131[1] mas
Distance1,213 ± 6 ly
(372 ± 2 pc)
Details[3]
Mass0.828±0.067 M☉
Radius0.858±0.024 R☉
Surface gravity (log g)4.489±0.013[4] cgs
Temperature5600±150 K
Metallicity [Fe/H]−0.37±0.13 dex
Rotation16.0±1.0 d
Rotational velocity (v sin i)1.9±1.2 km/s
Age9.6+3.4
−4.2 Gyr
Other designations
GSC 08797-00758, 2MASS J21145687-5552184, DENIS J211456.8-555218[5]
Database references
SIMBADdata

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]

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

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]

The WASP-46 planetary system[4]
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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Queloz, D. et al. (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, doi:10.1111/j.1365-2966.2012.20635.x, Bibcode: 2012MNRAS.422.1988A 
  3. ↑ 3.0 3.1 Bonomo, A. 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. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. 
  4. ↑ 4.0 4.1 4.2 Ciceri, S.; Mancini, L.; Southworth, J.; Lendl, M.; Tregloan-Reed, J.; Brahm, R.; Chen, G.; d'Ago, G. 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, doi:10.1093/mnras/stv2698, Bibcode: 2016MNRAS.456..990C 
  5. ↑ "WASP-46". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-46. 
  6. ↑ 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, doi:10.1051/0004-6361/201525774, Bibcode: 2015A&A...577A..90M 
  7. ↑ Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal 766 (1): 9, doi:10.1088/0004-637X/766/1/9, Bibcode: 2013ApJ...766....9S 
  8. ↑ Ribas, Á.; Merín, B.; Ardila, D. R.; Bouy, H. (2012), "Warm Debris Disks Candidates in Transiting Planets Systems", Astronomy & Astrophysics 541: A38, doi:10.1051/0004-6361/201118306, Bibcode: 2012A&A...541A..38R 
  9. ↑ 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, doi:10.1051/0004-6361/201423795 
  10. ↑ Wong, Ian; Shporer, Avi; Daylan, Tansu; Benneke, Björn; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland et al. (2020), "Systematic phase curve study of known transiting systems from year one of the TESS mission", The Astronomical Journal 160 (4): 155, doi:10.3847/1538-3881/ababad, Bibcode: 2020AJ....160..155W 
  11. ↑ 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, doi:10.1093/mnras/stx2647, Bibcode: 2018MNRAS.473.5126P 

Coordinates: Sky map 21h 14m 56.8596s, −55° 52′ 18.4600″



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