Astronomy:HAT-P-28

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Short description: Star in the constellation Andromeda
HAT-P-28
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  00h 52m 00.1878s[1]
Declination +34° 43′ 42.2030″[1]
Apparent magnitude (V) 13.03[2]
Characteristics
Evolutionary stage main-sequence star
Spectral type G
Astrometry
Radial velocity (Rv)48.06[1] km/s
Proper motion (μ) RA: 25.519[1] mas/yr
Dec.: 2.859[1] mas/yr
Parallax (π)2.4633 ± 0.0337[3] mas
Distance1,320 ± 20 ly
(406 ± 6 pc)
Orbit[4]
PrimaryHAT-P-28
CompanionHAT-P-28 B
Semi-major axis (a)0.994±0.002"
(404 AU)
Details[5]
Mass1.02±0.05 M☉
Radius1.10+0.09−0.07 R☉
Luminosity1.13+0.23−0.16[2] L☉
Surface gravity (log g)4.36±0.06[2] cgs
Temperature5680±90[2] K
Metallicity [Fe/H]0.12±0.08[2] dex
Rotational velocity (v sin i)0.2+0.5−0.2[2] km/s
Age6.1+2.6−1.9[2] Gyr
Other designations
HAT-P-28, Gaia DR2 363702817083391232, GSC 02284-00503, 2MASS J00520018+3443422[1]
Database references
SIMBADdata

HAT-P-28 is the primary of a binary star system about 1320 light-years away. It is a G-type main-sequence star. The star's age is older than the Sun's at 6.1+2.6−1.9 billion years.[2] HAT-P-28 is slightly enriched in heavy elements, having a 130% concentration of iron compared to the Sun. Since 2014, the binary star system is suspected to be surrounded by a debris disk with a 6.1″(2500 AU) radius.[6]

The red dwarf stellar companion was detected in 2015 at a projected separation of 0.972″[7] and confirmed in 2016 to be either bound or comoving.[4]

Planetary system

In 2011 a transiting hot Jupiter planet b was detected on a nearly circular orbit. The planetary equilibrium temperature is 1384±52 K.[2] No orbital decay was detected as in 2018, despite the close proximity of the planet to the host star.[5]

The HAT-P-28 planetary system[5][2]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.626±0.037 MJ 0.0434±0.0007 3.257215±0.000007 0.051±0.033 88.0±0.9° 1.190+0.102−0.075 RJ

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "HAT-P-28". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-28. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Buchhave, L. A.; Bakos, G. Á.; Hartman, J. D.; Torres, G.; Latham, D. W.; Andersen, J.; Kovács, G.; Noyes, R. W. et al. (2011), "HAT-P-28b AND HAT-P-29b: TWO SUB-JUPITER MASS TRANSITING PLANETS", The Astrophysical Journal 733 (2): 116, doi:10.1088/0004-637X/733/2/116, Bibcode: 2011ApJ...733..116B 
  3. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  4. ↑ 4.0 4.1 Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad et al. (2016), "FRIENDS OF HOT JUPITERS. IV. STELLAR COMPANIONS BEYOND 50 au MIGHT FACILITATE GIANT PLANET FORMATION, BUT MOST ARE UNLIKELY TO CAUSE KOZAI–LIDOV MIGRATION", The Astrophysical Journal 827 (1): 8, doi:10.3847/0004-637X/827/1/8, Bibcode: 2016ApJ...827....8N 
  5. ↑ 5.0 5.1 5.2 Penev, Kaloyan; Bouma, L. G.; Winn, Joshua N.; Hartman, Joel D. (2018), "Empirical Tidal Dissipation in Exoplanet Hosts from Tidal Spin-up", The Astronomical Journal 155 (4): 165, doi:10.3847/1538-3881/aaaf71, PMID 31080254, Bibcode: 2018AJ....155..165P 
  6. ↑ Merín, Bruno; Ardila, David R.; Ribas, Álvaro; Bouy, Hervé; Bryden, Geoffrey; Stapelfeldt, Karl; Padgett, Deborah (2014), "Herschel/PACS photometry of transiting-planet host stars with candidate warm debris disks", Astronomy & Astrophysics 569: A89, doi:10.1051/0004-6361/201322956, Bibcode: 2014A&A...569A..89M 
  7. ↑ Wöllert, Maria; Brandner, Wolfgang (2015), "A Lucky Imaging search for stellar sources near 74 transit hosts", Astronomy & Astrophysics 579: A129, doi:10.1051/0004-6361/201526525, Bibcode: 2015A&A...579A.129W 

Coordinates: Sky map 02h 12m 31.4785s, +51° 46′ 43.5621″




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