WASP-48

WASP-48
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 24m 38.9616s[1]
Declination +55° 28′ 23.3317″[1]
Apparent magnitude (V) 11.65±0.14
Characteristics
Spectral type G0IV
Astrometry
Radial velocity (Rv)-19.740 km/s
Proper motion (μ) RA: 6.141 mas/yr
Dec.: -27.969 mas/yr
Parallax (π)2.1732 ± 0.0213 mas[1]
Distance1,500 ± 10 ly
(460 ± 5 pc)
Details[2]
Mass1.19±0.04 M☉
Radius1.75±0.07 R☉
Surface gravity (log g)4.03±0.03 cgs
Temperature5920±150 K
Metallicity−0.12±0.12
Rotational velocity (v sin i)12.2±0.7 km/s
Age6+5
−4 Gyr
Other designations
Gaia DR2 2141754578242371584, TYC 3925-739-1, GSC 03925-00739, 2MASS J19243895+5528233[1]
Database references
SIMBADdata

WASP-48 is a subgiant star about 1400 light-years away. The star is likely older than Sun and slightly depleted in heavy elements. It shows an infrared excess noise of unknown origin,[3] yet has no detectable ultraviolet emissions associated with the starspot activity.[4] The discrepancy may be due to large interstellar absorption of light in interstellar medium for WASP-48.[5] The measurements are compounded by the emission from eclipsing contact binary NSVS-3071474 projected on sky plane nearby,[6] although no true stellar companions were detected by survey in 2015.[7]

The star is rotating rapidly, being spun up by the tides raised by the giant planet on close orbit.[8]

  1. ^ a b c d Cite error: The named reference simbad was invoked but never defined (see the help page).
  2. ^ Enoch, B.; Anderson, D. R.; Barros, S. C. C.; Brown, D. J. A.; Collier Cameron, A.; Faedi, F.; Gillon, M.; Hébrard, G.; Lister, T. A.; Queloz, D.; Santerne, A.; Smalley, B.; Street, R. A.; Triaud, A. H. M. J.; West, R. G.; Bouchy, F.; Bento, J.; Butters, O.; Fossati, L.; Haswell, C. A.; Hellier, C.; Holmes, S.; Jehen, E.; Lendl, M.; Maxted, P. F. L.; McCormac, J.; Miller, G. R. M.; Moulds, V.; Moutou, C.; et al. (2011), "WASP-35b, WASP-48b and WASP-51b: Two new planets and an independent discovery of HAT-P-30b", The Astronomical Journal, 142 (3): 86, arXiv:1104.2827, Bibcode:2011AJ....142...86E, doi:10.1088/0004-6256/142/3/86, S2CID 63996398
  3. ^ Sada, Pedro V.; Deming, Drake; Jennings, Donald E.; Jackson, Brian k.; Hamilton, Catrina M.; Fraine, Jonathan; Peterson, Steven W.; Haase, Flynn; Bays, Kevin; Lunsford, Allen; o'Gorman, Eamon (2012), "Extrasolar Planet Transits Observed at Kitt Peak National Observatory", Publications of the Astronomical Society of the Pacific, 124 (913): 212–229, arXiv:1202.2799, Bibcode:2012PASP..124..212S, doi:10.1086/665043, S2CID 29665395
  4. ^ 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
  5. ^ Fossati, L.; Marcelja, S. E.; Staab, D.; Cubillos, P. E.; France, K.; Haswell, C. A.; Ingrassia, S.; Jenkins, J. S.; Koskinen, T.; Lanza, A. F.; Redfield, S.; Youngblood, A.; Pelzmann, G. (2017), "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies", Astronomy & Astrophysics, 601: A104, arXiv:1702.02883, Bibcode:2017A&A...601A.104F, doi:10.1051/0004-6361/201630339, S2CID 17549819
  6. ^ Cite error: The named reference Ciceri2015 was invoked but never defined (see the help page).
  7. ^ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579
  8. ^ Brown, D. J. A. (2014), "Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?", Monthly Notices of the Royal Astronomical Society, 442 (2): 1844–1862, arXiv:1406.4402, Bibcode:2014MNRAS.442.1844B, doi:10.1093/mnras/stu950, S2CID 56052792