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HAT-P-2b is an extrasolar planet detected by the HATNet Project in May 2007. It orbits a class F star HAT-P-2, (bigger and hotter than the Sun), located about 420 light-years away in the constellation Hercules.

HAT-P-2b
Size comparison of HAT-P-2b with Jupiter.
Discovery
Discovered byHATNet Project[1]
Discovery date2007-05-01[2]
Detection method
Transit
Orbital characteristics
Semi-major axis
0.06880+0.00065
−0.00070 AU
Eccentricity0.50833+0.00082
−0.00075[3]
Orbital period (sidereal)
5.6334729±0.0000061 days[4] d
Inclination85.97+0.28
−0.25[5]
Time of periastron
2455289.4721±0.0038[5]
Argument of periastron
188.09±0.39[5]
Semi-amplitude983.9±17.2[4]
StarHD 147506
Physical characteristics
Mean radius
1.106±0.061[5] RJ
Mass8.70+0.19
−0.20[3] MJ
Mean density
7300±1600 kg m−3
Surface gravity
162±27 m/s²
Temperature1187[6]

    The planet HAT-P-2b is named Magor. The name was selected in the NameExoWorlds campaign by Hungary, during the 100th anniversary of the IAU. Magor was a legendary ancestor of the Magyar people and the Hungarian nation, and brother of Hunor (name of the star HAT-P-2).[7][8]


    Physical properties


    The planet's mass has been estimated to be 8.65 times that of Jupiter, while its diameter, at 135,978 km (84,493 mi), is 0.951 times Jupiter's. Its small size, despite the bloating of the planet's atmosphere, is caused by the strong gravity of the planet. The planetary atmosphere has indeed the smallest scale height, equal to 26km, among exoplanets with measurable atmospheres as at 2021.[9]

    This indicates its mean density is twice that of Earth and its surface gravity approximately 24 times that on Earth, almost equal to the Sun.

    In addition to heat from its primary star, tidal heating is thought to have played a significant role in this planet's evolution.[10]


    Orbit


    Planetary orbital period is 5 days 15 hours, and inclination is such what it crosses directly in front of the star as viewed from Earth.[1][2] The orbit is very eccentric, ranging from 4.90 million to 15.36 million miles from the star.[2]


    As of August 2008, the most recent calculation of HAT-P-2b's Rossiter–McLaughlin effect and so spin-orbit angle was that of Winn in 2007 but Loeillet has in 2008 disputed it.[11][12] For Winn this is +1 ± 13 degrees.[13] The study in 2012, have determined the planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to 9±10°.[14]


    Other planets in system


    It has been suggested that there is a second outer planet perturbing HAT-P-2b, although thus far, this has neither been proven or disproven.[2]


    References


    1. Bakos, G. Á.; et al. (2007). "HD 147506b: A Supermassive Planet in an Eccentric Orbit Transiting a Bright Star". The Astrophysical Journal. 670 (1): 826–832. arXiv:0705.0126. Bibcode:2007ApJ...670..826B. doi:10.1086/521866.
    2. Aguilar, David A.; Pulliam, Christine (2007-05-01). "Astronomers find super-massive planet" (Press release). Harvard-Smithsonian Center for Astrophysics. Retrieved 2019-01-05.
    3. Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602 (107): A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
    4. Pál, András; et al. (2010). "Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system". Monthly Notices of the Royal Astronomical Society. 401 (4): 2665–2674. arXiv:0908.1705. Bibcode:2010MNRAS.401.2665P. doi:10.1111/j.1365-2966.2009.15849.x.
    5. Lewis, Nikole K.; et al. (2013). "Orbital Phase Variations of the Eccentric Giant Planet HAT-P-2b". The Astrophysical Journal. 766 (2): 95. arXiv:1302.5084. Bibcode:2013ApJ...766...95L. doi:10.1088/0004-637X/766/2/95.
    6. Ravilious, Kate (May 3, 2007). ""Weird" New Planet Weighs as Much as 2,500 Earths". National Geographic News. Retrieved 2007-05-04.
    7. "Approved names". NameExoworlds. Retrieved 2020-01-02.
    8. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
    9. Baxter, Claire; Désert, Jean-Michel; Tsai, Shang-Min; Todorov, Kamen O.; Bean, Jacob L.; Deming, Drake; Parmentier, Vivien; Fortney, Jonathan J.; Line, Michael; Thorngren, Daniel; Pierrehumbert, Raymond T.; Burrows, Adam; Showman, Adam P. (2021), "Evidence for disequilibrium chemistry from vertical mixing in hot Jupiter atmospheres", Astronomy & Astrophysics, 648: A127, arXiv:2103.07185, doi:10.1051/0004-6361/202039708
    10. Jackson, Brian; et al. (2008). "Tidal Heating of Extra-Solar Planets". Astrophysical Journal. 681 (2): 1631. arXiv:0803.0026. Bibcode:2008ApJ...681.1631J. doi:10.1086/587641.
    11. Joshua N. Winn (2008). "Measuring accurate transit parameters". Proceedings of the International Astronomical Union. 4: 99–109. arXiv:0807.4929. Bibcode:2009IAUS..253...99W. doi:10.1017/S174392130802629X.
    12. Loeillet, B.; et al. (2008). "Refined parameters and spectroscopic transit of the super-massive planet HD 147506b". Astronomy and Astrophysics. 481 (2): 529–533. arXiv:0707.0679. Bibcode:2008A&A...481..529L. doi:10.1051/0004-6361:20078167.
    13. Winn; et al. (2007). "Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b". Astrophysical Journal Letters. 665 (2): L167. arXiv:0707.0503. Bibcode:2007ApJ...665L.167W. doi:10.1086/521362.
    14. Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments", The Astrophysical Journal, 757: 18, arXiv:1206.6105, doi:10.1088/0004-637X/757/1/18


    Media related to HAT-P-2b at Wikimedia Commons


    На других языках

    [de] HAT-P-2b

    HAT-P-2b ist ein Extrasolarer Planet, der den gelben Zwerg HAT-P-2 alle 5,633 Tage umkreist. Auf Grund seiner hohen Masse wird angenommen, dass es sich um einen Gasplaneten handelt.
    - [en] HAT-P-2b

    [es] HAT-P-2b

    HAT-P-2b es un planeta extrasolar detectado por el Harvard-Smithsonian Center for Astrophysics en mayo de 2007, por medio del Proyecto HATNet. Orbita una estrella de tipo espectral F llamada HD 147506, más grande y más caliente que el sol, situada a 440 años luz en la constelación de Hércules. El planeta pasa por delante de su estrella cada 5 días y 15 horas, de tal forma que pueda ser visto desde la Tierra.


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