WASP-11b/HAT-P-10b

WASP-11b/HAT-P-10b
Size comparison of WASP-11b/HAT-P-10b with Jupiter.
Discovery
Discovered byWest et al. (SuperWASP)
Bakos et al. (HATNet)
Discovery siteSAAO
Discovery dateApril 1, 2008 (announced)
September 26, 2008 (preprints)
Transit
Orbital characteristics
0.0439+0.0006
−0.0009[1] AU
Eccentricity0[1]
3.7224690 ± 0.0000067[1] d
Inclination88.5 ± 0.6[1]
Semi-amplitude69.1 ± 3.5[1]
StarWASP-11/HAT-P-10[2]
Physical characteristics
1.045+0.050
−0.033[1] RJ
Mass0.460 ± 0.028[1] MJ
Mean density
0.498 ± 0.064 g/cm3[1]
10.5 m/s2 (34 ft/s2)[1]
Temperature1030+26
−19[1][note 1]

WASP-11b/HAT-P-10b or WASP-11Ab/HAT-P-10Ab[3] is an extrasolar planet discovered in 2008. The discovery was announced (under the designation WASP-11b) by press release by the SuperWASP project in April 2008 along with planets WASP-6b through to WASP-15b, however at this stage more data was needed to confirm the parameters of the planets and the coordinates were not given.[4] On 26 September 2008, the HATNet Project's paper describing the planet which they designated HAT-P-10b appeared on the arXiv preprint server.[1] The SuperWASP team's paper appeared as a preprint on the Extrasolar Planets Encyclopaedia on the same day, confirming that the two objects (WASP-11b and HAT-P-10b) were in fact the same, and the teams agreed to use the combined designation.[2]

The planet had the third lowest insolation of the known transiting planets at the time of the discovery (prior to this, Gliese 436 b and HD 17156 b were known to have lower insolation). The temperature implies it falls into the pL class of hot Jupiters: planets which lack significant quantities of titanium(II) oxide and vanadium(II) oxide in their atmospheres and do not have temperature inversions.[5] An alternative classification system for hot Jupiters is based on the equilibrium temperature and the planet's Safronov number.[note 2] In this scheme, for a given temperature, class I planets have high Safronov numbers and tend to be in orbit around cooler host stars, while class II planets have lower Safronov numbers.[6] In the case of WASP-11b/HAT-P-10b, the equilibrium temperature is 1030 K[note 1] and the Safronov number is 0.047±0.003, which means it is located close to the dividing line between the class I and class II planets.[1]

The planet is in a binary star system, the second star is WASP-11 B, with a mass 0.34 ± 0.05 of the Sun and a temperature of 3483 ± 43 K.[7]

Notes

  1. ^ a b Assumes the planet has zero albedo. Its secondary transit of the planet behind its star has not yet been observed and so the temperature provided is a hypothetical "equilibrium temperature".
  2. ^ The Safronov number is defined as

See also

References

  1. ^ a b c d e f g h i j k l Bakos, G. Á.; et al. (2009). "HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf". The Astrophysical Journal. 696 (2): 1950–1955. arXiv:0809.4295. Bibcode:2009ApJ...696.1950B. doi:10.1088/0004-637X/696/2/1950. S2CID 12146075.
  2. ^ a b Schneider, J. "Notes for star WASP-11/HAT-P-10". Extrasolar Planets Encyclopaedia. Archived from the original on 2008-10-01. Retrieved 2008-09-29.
  3. ^ West, R. G; Collier Cameron, A; Hebb, L; Joshi, Y. C; Pollacco, D; Simpson, E; Skillen, I; Stempels, H. C; Wheatley, P. J; Wilson, D; Anderson, D; Bentley, S; Bouchy, F; Enoch, B; Gibson, N; Hébrard, G; Hellier, C; Loeillet, B; Mayor, M; Maxted, P; McDonald, I; Moutou, C; Pont, F; Queloz, D; Smith, A. M. S; Smalley, B; Street, R. A; Udry, S (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph.EP].
  4. ^ "WASP Planets". SuperWASP. 5 December 2013. Retrieved 2016-01-26.
  5. ^ Fortney, J. J.; et al. (2008). "A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres". The Astrophysical Journal. 678 (2): 1419–1435. arXiv:0710.2558. Bibcode:2008ApJ...678.1419F. doi:10.1086/528370. S2CID 17502177.
  6. ^ Hansen, B. M. S. & Barman, T. (2007). "Two Classes of Hot Jupiters". The Astrophysical Journal. 671 (1): 861–871. arXiv:0706.3052. Bibcode:2007ApJ...671..861H. doi:10.1086/523038. S2CID 16630784.
  7. ^ Open Exoplanet Catalogue WASP-11 20b

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