WASP-42 is aK-type main-sequence star. Its surface temperature is 5315±79K.[6] WASP-42 is similar to theSun in concentration of heavy elements, withmetallicity ([Fe/H]) of 0.05±0.13, and is much older than the Sun at11.3+1.5 −4.8 billion years.[4] The star does exhibitstarspot activity as is typical for its spectral class.[2]
Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017.[7]
^abcdeSouthworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M.; Evans, D.; Gu, S. -H.; Herrera-Cruces, A.; Hinse, T. C.; Jorgensen, U. G.; Juncher, D.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Skottfelt, J.; Tronsgaard, R.; Unda-Sanzana, E.; Wang, X. -B.; Wertz, O.; Alsubai, K. A.; Andersen, J. M.; Bozza, V.; Bramich, D. M.; Burgdorf, M.; et al. (2015),High-precision photometry by telescope defocussing. III. WASP-22, WASP-41, WASP-42 and WASP-55,arXiv:1512.05549,doi:10.1093/mnras/stw279,S2CID44864064
^abcdBonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; 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,arXiv:1704.00373,Bibcode:2017A&A...602A.107B,doi:10.1051/0004-6361/201629882,S2CID118923163
^Mortier, A.; Santos, N. C.; Sousa, S. G.; Fernandes, J. M.; Adibekyan, V. Zh.; Delgado Mena, E.; Montalto, M.; Israelian, G. (2013), "New and updated stellar parameters for 90 transit hosts The effect of the surface gravity",Astronomy and Astrophysics,558: A106,arXiv:1309.1998,Bibcode:2013A&A...558A.106M,doi:10.1051/0004-6361/201322240,S2CID118750676
^Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M. J.; Ciceri, S.; d'Ago, G.; Figuera Jaimes, R.; Gu, S.-H.; Hinse, T. C.; Henning, Th.; Hundertmark, M.; Kains, N.; Kerins, E.; Korhonen, H.; Kokotanekova, R.; Kuffmeier, M.; Longa-Peña, P.; Mancini, L.; MacKenzie, J.; Popovas, A.; Rabus, M.; Rahvar, S.; Sajadian, S.; Snodgrass, C.; et al. (2018), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016",Astronomy & Astrophysics,610: A20,arXiv:1709.07476,Bibcode:2018A&A...610A..20E,doi:10.1051/0004-6361/201731855,S2CID53400492
^Lendl, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Gillon, M.; Hellier, C.; Jehin, E.; Lister, T. A.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B.; Ségransan, D.; Smith, A. M. S.; Triaud, A. H. M. J.; Udry, S.; West, R. G.; Wheatley, P. J. (2012), "WASP-42 b and WASP-49 b: two new transiting sub-Jupiters",Astronomy & Astrophysics,544: A72,arXiv:1205.2757,Bibcode:2012A&A...544A..72L,doi:10.1051/0004-6361/201219585,S2CID54186638
