Hosta

by | Mar 16, 2018 | Hosta

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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]

Planetary system

In 2011 a transiting hot Jupiter planet b was detected.[2]

The WASP-48 planetary system[2][6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.98±0.09 MJ 0.03320±0.00077 2.143634±0.000003 0 80.09+0.69
−0.55° 		1.396±0.051 RJ

References

  1. ^ a b c d WASP-48 -- Star
  2. ^ a b c 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, 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. ^ a b Ciceri, S.; Mancini, L.; Southworth, J.; Bruni, I.; Nikolov, N.; d'Ago, G.; Schröder, T.; Bozza, V.; Tregloan-Reed, J.; Henning, Th. (2015), "Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry", Astronomy & Astrophysics, 577: A54, arXiv:1503.00762, Bibcode:2015A&A...577A..54C, doi:10.1051/0004-6361/201425449, S2CID 53607610
  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


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