Astronomy:WASP-42

From HandWiki

WASP-42 is a K-type main-sequence star about 580 light-years away in the constellation Centaurus. Its surface temperature is 5315±79 K.[1] WASP-42 is similar to the Sun in concentration of heavy elements, with metallicity ([Fe/H]) of 0.05±0.13, and is much older than the Sun at 11.3+1.5
−4.8 billion years.[2] The star does exhibit starspot activity as is typical for its spectral class.[3]

Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017.[4]

Planetary system

In 2012, one planet, named WASP-42b, was discovered[5] on a tight, mildly eccentric orbit.[2] The planetary equilibrium temperature is 1,021±19 K.[3]

The WASP-42 planetary system[2]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.501±0.034 MJ 0.0548+0.0017−0.0018 4.9816872±0.0000073 0.062+0.013−0.011 88.30+0.26−0.23° 1.063±0.051 RJ

References

  1. ↑ Southworth, John et al. (2016). "High-precision photometry by telescope defocussing – VIII. WASP-22, WASP-41, WASP-42 and WASP-55". Monthly Notices of the Royal Astronomical Society 457 (4): 4205–4217. doi:10.1093/mnras/stw279. Bibcode: 2016MNRAS.457.4205S. 
  2. ↑ 2.0 2.1 2.2 Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A. et al. (2017), "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy & Astrophysics A107: 602, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B 
  3. ↑ 3.0 3.1 Southworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M. et al. (2015), High-precision photometry by telescope defocussing. III. WASP-22, WASP-41, WASP-42 and WASP-55, doi:10.1093/mnras/stw279, Bibcode: 2016MNRAS.457.4205S 
  4. ↑ Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M. et al. (2018), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016", Astronomy & Astrophysics 610: A20, doi:10.1051/0004-6361/201731855, Bibcode: 2018A&A...610A..20E 
  5. ↑ Lendl, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Gillon, M.; Hellier, C.; Jehin, E.; Lister, T. A. et al. (2012), "WASP-42 b and WASP-49 b: two new transiting sub-Jupiters", Astronomy & Astrophysics 544: A72, doi:10.1051/0004-6361/201219585, Bibcode: 2012A&A...544A..72L 

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Coordinates: Sky map 12h 51m 55.5580s, −42° 04′ 25.0949″



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