WASP-45

Last updated
WASP-45
Observation data
Epoch J2000       Equinox J2000
Constellation Sculptor [1]
Right ascension 00h 20m 56.99413s [2]
Declination −35° 59′ 53.7466″ [2]
Apparent magnitude  (V)11.8 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type K2V [4]
Astrometry
Radial velocity (Rv)4.71±0.33 [2] km/s
Proper motion (μ)RA: 52.831 mas/yr [2]
Dec.: −46.940 mas/yr [2]
Parallax (π)4.6520±0.0226  mas [2]
Distance 701 ± 3  ly
(215 ± 1  pc)
Details [5]
Mass 0.932+0.045
−0.046  M☉
Radius 0.891±0.013  R☉
Luminosity 0.510±0.013  L☉
Surface gravity (log g)4.508+0.023
−0.025  cgs
Temperature 5167±29  K
Metallicity [Fe/H]0.388+0.090
−0.10  dex
Rotational velocity (v sin i)2.3±0.7 km/s
Age 5.4+4.7
−3.5  Gyr
Other designations
TOI-229, TIC 120610833, WASP-45, TYC 6996-583-1, GSC 06996-00583, 2MASS J00205699-3559537 [6]
Database references
SIMBAD data
Exoplanet Archive data

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. [5] WASP-45 has low ultraviolet emission, therefore it is suspected to have a low starspot activity, [7] although chromospheric activity was reported elsewhere. [4]

There is a companion star at a separation of 4.4 arcseconds, corresponding to 929 AU. The companion is estimated to have a mass of 0.157  M☉ and a temperature of 3,154  K . Although it shares a similar distance and common proper motion with the primary star, its relative space velocity appears to be high enough that the pair are not gravitationally bound. [8]

Planetary system

In 2011 a transiting hot Jupiter planet, WASP-45b, was detected. [4] The planet equilibrium temperature is 1,170±24  K . No Rayleigh scattering was detected in the planetary atmosphere, implying the existence of hazes or a high cloud deck. [9]

The WASP-45 planetary system [9] [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b1.018+0.046
−0.045  MJ 		0.04089+0.00065
−0.00069		3.1260876(35) [10] <0.043 [10] 84.686±0.098 ° 0.978+0.026
−0.024  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. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
  4. 1 2 3 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
  5. 1 2 3 Addison, Brett; Wright, Duncan J.; Wittenmyer, Robert A.; Horner, Jonathan; Mengel, Matthew W.; Johns, Daniel; Marti, Connor; Nicholson, Belinda; Okumura, Jack; Bowler, Brendan; Crossfield, Ian; Kane, Stephen R.; Kielkopf, John; Plavchan, Peter; Tinney, C. G.; Zhang, Hui; Clark, Jake T.; Clerte, Mathieu; Eastman, Jason D.; Swift, Jon; Bottom, Michael; Muirhead, Philip; McCrady, Nate; Herzig, Erich; Hogstrom, Kristina; Wilson, Maurice; Sliski, David; Johnson, Samson A.; Wright, Jason T.; et al. (2019), "MINERVA-Australis I: Design, Commissioning, & First Photometric Results", Publications of the Astronomical Society of the Pacific, 131 (1005): 115003, arXiv: 1901.11231 , Bibcode:2019PASP..131k5003A, doi:10.1088/1538-3873/ab03aa, S2CID   119370785
  6. ↑ "WASP-45". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 10 December 2023.
  7. ↑ 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
  8. ↑ 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. Bibcode:2019MNRAS.490.5088M. doi: 10.1093/mnras/stz2673 .
  9. 1 2 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
  10. 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.
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