HD 147506

HD 147506, also known as HAT-P-2 and formally named Hunor, is a magnitude 8.7 F8 dwarf star that is somewhat larger and hotter than the Sun. The star is approximately 419 light-years (128 parsecs) from Earth and is positioned near the keystone of Hercules.[3] It is estimated to be 2 to 3 billion years old, towards the end of its main sequence life.[2] There is one known transiting exoplanet, and a second planet not observed to transit.[9]

HD 147506 / Hunor
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hercules[1]
Right ascension 16h 20m 36.3576s[2]
Declination +41° 02′ 53.107″[2]
Apparent magnitude (V) +8.71[3]
Characteristics
Spectral type F8V[3]
Variable type planetary transit,[4] planet-induced stellar pulsations[5]
Astrometry
Radial velocity (Rv)−20.47±0.30[2] km/s
Proper motion (μ) RA: −10.078(12) mas/yr[2]
Dec.: −29.057(15) mas/yr[2]
Parallax (π)7.7811 ± 0.0118 mas[2]
Distance419.2 ± 0.6 ly
(128.5 ± 0.2 pc)
Absolute magnitude (MV)+3.31[6]
Details
Mass1.360±0.040[7] M☉
Radius1.640+0.090
−0.080[7] R☉
Luminosity4.3[2] L☉
Surface gravity (log g)4.14±0.04[8] cgs
Temperature6,290±60[7] K
Metallicity [Fe/H]0.140±0.080[7] dex
Rotational velocity (v sin i)20.80±0.30[7] km/s
Age2.60±0.50[7] Gyr
Other designations
HAT-P-2, BD+41°2693, HD 147506, HIP 80076, SAO 46035[3]
Database references
SIMBADdata

Nomenclature

The designation HD 147506 comes from the Henry Draper Catalogue. When the star was found to have a planet by the HATNet Project, it was assigned the designation HAT-P-2, indicating that it was the second star found to have a planet by this project.[4]

The star HAT-P-2 has the proper name Hunor. The name was selected in the NameExoWorlds campaign by Hungary, during the 100th anniversary of the IAU. Hunor was a legendary ancestor of the Huns and the Hungarian nation, and brother of Magor (name of the planet HAT-P-2b).[10]

Variability

In addition to being a planetary transit variable, there are also stellar pulsations induced by the planet. This is the first known instance of a planet inducing pulsations in its host star. The amplitude is very small at approximately 40 parts per million. These pulsations correspond to exact harmonics of the planet's orbital frequency, indicating they are of a tidal origin.[5]

Planetary system

Orbiting the star is HAT-P-2b, later named Magor, which was at the time of its discovery the most massive transiting exoplanet.[4] At around 9 times the mass of Jupiter and an estimated surface temperature of ~900 kelvins, on a 5.6 day orbit, this planet is unlike any previously discovered transiting planet. The planet has a large mass (nine times the mass of Jupiter), and a surface gravity 25 times that exerted by the Earth. Its orbital eccentricity is very large (e = 0.5). Since tidal forces should have reduced the orbital eccentricity of this planet, it was speculated that another massive planet found outside the orbit of HAT-P-2b is in orbital resonance with HAT-P-2b.[11][6]

The planet was discovered by the HATNet Project, and the researchers there found the planet to be 10-20% larger than Jupiter. This discovery is important as it provides further support for the existing theory of planetary structure.[12]

Additional measurements taken over six years show a long-term linear trend in the radial velocity data consistent with a companion of 15 Jupiter masses or greater. Adaptive optics images were taken at the Keck telescope, and when combined with the radial velocity data show the maximum mass of the companion is that of an M dwarf star.[13] In 2023 the presence of an outer companion, HAT-P-2c, was confirmed, and its mass found to be planetary at around 11 times that of Jupiter.[9]

The HD 147506 planetary system[7][9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Magor 8.70+0.19
−0.20 MJ		 0.06880+0.00065
−0.00070		 5.6334754(26) 0.50833+0.00082
−0.00075		 86.72+1.1
−0.87°		 1.157+0.073
−0.063 RJ
c 10.7+5.2
−2.2 MJ		 — 8500+2600
−1500		 0.37+0.13
−0.12		 90±16° —

See also

References
  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034.Vizier query form
  2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. "HD 147506". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-24.
  4. 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. S2CID 18286425.
  5. Wit, Julien de; et al. (2017). "Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System". The Astrophysical Journal Letters. 836 (2) L17. arXiv:1702.03797. Bibcode:2017ApJ...836L..17D. doi:10.3847/2041-8213/836/2/L17. S2CID 45906585.
  6. 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. S2CID 15447826.
  7. 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 A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
  8. Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
  9. de Beurs, Zoë L.; de Wit, Julien; et al. (October 2023). "Revisiting Orbital Evolution in HAT-P-2 b and Confirmation of HAT-P-2 c". The Astronomical Journal. 166 (4): 136. arXiv:2309.03256. Bibcode:2023AJ....166..136D. doi:10.3847/1538-3881/acedf1.
  10. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  11. Alan MacRobert, “New Worlds roundup,” Sky and Telescope, August 2007, pg 15.
  12. Systemic Planetary Simulation
  13. 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. S2CID 9800690.
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