Astronomy:WASP-45

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Short description: K-type main sequence star in the constellation of Sculptor
WASP-45
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sculptor
Right ascension  00h 20m 56.99413s[1]
Declination −35° 59′ 53.7466″[1]
Apparent magnitude (V) 11.8[2]
Characteristics
Spectral type K2V[3]
Astrometry
Radial velocity (Rv)4.71±0.33[1] km/s
Proper motion (μ) RA: 52.831[1] mas/yr
Dec.: −46.940[1] mas/yr
Parallax (π)4.6520 ± 0.0226[1] mas
Distance701 ± 3 ly
(215 ± 1 pc)
Details[4]
Mass0.932+0.045
−0.046 M☉
Radius0.891±0.013 R☉
Luminosity0.510±0.013 L☉
Surface gravity (log g)4.508+0.023
−0.025 cgs
Temperature5167±29 K
Metallicity [Fe/H]0.388+0.090
−0.10 dex
Rotational velocity (v sin i)2.3±0.7 km/s
Age5.4+4.7
−3.5 Gyr
Other designations
TYC 6996-583-1, GSC 06996-00583, 2MASS J00205699-3559537[2]
Database references
SIMBADdata

WASP-45 is a K-type main-sequence star about 701 light-years (215 parsecs) away. The star's age cannot be well constrained, but it is probably older than the Sun. Yet, WASP-45 is enriched in heavy elements compared to the Sun, having 240% of the solar abundance.[4]

The star has low ultraviolet emission, therefore it is suspected to have a low starspot activity,[5] although chromospheric activity was reported elsewhere.[3]

There is a companion star at a separation of 4.4 arcseconds, corresponding to 929 AU.[6]

Planetary system

In 2011 a transiting hot Jupiter planet, WASP-45b, was detected.[3] The planet equilibrium temperature is 1170±24 K. No Rayleigh scattering was detected in the planetary atmosphere, implying the existence of hazes or a high cloud deck.[7]

The WASP-45 planetary system[7][4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 1.018+0.046
−0.045 MJ 		0.04089+0.00065
−0.00069 		3.1260876(35)[8] <0.043[8] 84.686±0.098° 0.978+0.026
−0.024 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 "WASP-45". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-45. 
  3. ↑ 3.0 3.1 3.2 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 
  4. ↑ 4.0 4.1 4.2 Addison, Brett; Wright, Duncan J.; Wittenmyer, Robert A.; Horner, Jonathan; Mengel, Matthew W.; Johns, Daniel; Marti, Connor; Nicholson, Belinda et al. (2019), "MINERVA-Australis I: Design, Commissioning, & First Photometric Results", Publications of the Astronomical Society of the Pacific 131 (1005): 115003, doi:10.1088/1538-3873/ab03aa, Bibcode: 2019PASP..131k5003A 
  5. ↑ 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 
  6. ↑ Mugrauer, M. (December 2019). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society 490 (4): 5088–5102. doi:10.1093/mnras/stz2673. Bibcode: 2019MNRAS.490.5088M. 
  7. ↑ 7.0 7.1 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 
  8. ↑ 8.0 8.1 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. 

Coordinates: Sky map 00h 20m 56.9940s, −35° 59′ 53.7474″



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