WASP-11b/HAT-P-10b

WASP-11b/HAT-P-10b

Exoplanet		List of exoplanets
Size comparison of WASP-11b/HAT-P-10b with Jupiter.
Parent star
Star		WASP-11/HAT-P-10[1]
Constellation		Perseus
Right ascension	(α)	03^h 09^m 28.55^s[2]
Declination	(δ)	+30° 40′ 24.9″[2]
Apparent magnitude	(mV)	11.89
Distance		408+20 −16[2] ly (125+6 −5[2] pc)
Spectral type		K3V[3]
Orbital elements
Semi-major axis	(a)	0.0439+0.0006 −0.0009[2] AU
Eccentricity	(e)	0[2]
Orbital period	(P)	3.7224690 ± 0.0000067[2] d
Inclination	(i)	88.5 ± 0.6[2]°
Time of transit	(Tt)	2454729.90631 ± 0.00030[2] JD
Semi-amplitude	(K)	69.1 ± 3.5[2] m/s
Physical characteristics
Mass	(m)	0.460 ± 0.028[2] MJ
Radius	(r)	1.045+0.050 −0.033[2] RJ
Density	(ρ)	498 ± 64[2] kg m^−3
Surface gravity	(g)	10.5[2] m/s²
Temperature	(T)	1030+26 −19[2][note 1]
Discovery information
Discovery date		April 1, 2008 (announced) September 26, 2008 (preprints)
Discoverer(s)		West et al. (SuperWASP) Bakos et al. (HATNet)
Discovery method		Transit
Discovery site		SAAO
Discovery status		Independently confirmed
Other designations
WASP-11b, HAT-P-10b
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

WASP-11b/HAT-P-10b or WASP-11Ab/HAT-P-10Ab^[4] 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.^[5] On 26 September 2008, the HATNet Project's paper describing the planet which they designated HAT-P-10b appeared on the arXiv preprint server.^[2] 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.^[1]

The planet has the third lowest insolation of the known transiting planets (only Gliese 436 b and HD 17156 b 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.^[6] 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.^[7] 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.^[2]

Notes

1. 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 $\textstyle \Theta = \frac{1}{2} \left(\frac{\mathrm{Planetary\ escape\ velocity}}{\mathrm{Orbital\ velocity}}\right)^2$

See also

• OGLE-TR-111b

References

1. Schneider, J. "Notes for star WASP-11/HAT-P-10". The Extrasolar Planets Encyclopaedia. Retrieved 2008-09-29.
2. 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.
3. West, R. G.; et al. (2008). "The sub-Jupiter mass transiting exoplanet WASP-11b". arXiv:0809.4597v1 [astro-ph].
4. http://arxiv.org/abs/1109.2497
5. "WASP Planets". SuperWASP. Retrieved 2016-01-26.
6. 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.
7. Hansen, B. M. S. & Barman, T. (2007). "Two Classes of Hot Jupiters". The Astrophysical Journal 671: 861–871. arXiv:0706.3052. Bibcode:2007ApJ...671..861H. doi:10.1086/523038?journalCode=apj.

External links

Media related to WASP-11b/HAT-P-10b at Wikimedia Commons

Coordinates: 03^h 09^m 28.55^s, +30° 40′ 24.9″