HAT-P-28

HAT-P-28
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda[1]
Right ascension 00h 52m 00.1876s[2]
Declination +34° 43′ 42.205″[2]
Apparent magnitude (V) 13.03[3]
Characteristics
Evolutionary stage main sequence[3]
Spectral type G3[3]
Astrometry
Radial velocity (Rv)48.06[4] km/s
Proper motion (μ) RA: 25.615(14) mas/yr[2]
Dec.: 2.712(11) mas/yr[2]
Parallax (π)2.4728±0.0156 mas[2]
Distance1,319 ± 8 ly
(404 ± 3 pc)
Orbit[5]
PrimaryHAT-P-28
CompanionHAT-P-28 B
Semi-major axis (a)0.994±0.002"
(404 AU)
Details[6]
Mass1.02±0.05 M☉
Radius1.10+0.09
−0.07 R☉
Luminosity1.13+0.23
−0.16[3] L☉
Surface gravity (log g)4.36±0.06[3] cgs
Temperature5680±90[3] K
Metallicity [Fe/H]0.12±0.08[3] dex
Rotational velocity (v sin i)0.2+0.5
−0.2[3] km/s
Age6.1+2.6
−1.9[3] Gyr
Other designations
Gaia DR2 363702817083391232, GSC 02284-00503, 2MASS J00520018+3443422[4]
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.[3] HAT-P-28 is slightly enriched in heavy elements, having a 130% concentration of iron compared to the Sun. Evolutionary modelling shows it to be right at the end of its main sequence life.[2] The binary star system is suspected to be surrounded by a debris disk with a 6.1″(2500 AU) radius.[7]

The red dwarf stellar companion was detected in 2015 at a projected separation of 0.972″[8] and confirmed in 2016 to be either bound or co-moving.[5]

Planetary system

In 2011 a transiting hot Jupiter planet b was detected on a nearly circular orbit. The planetary equilibrium temperature is 1,384±52 K.[3] No orbital decay was detected as in 2018, despite the close proximity of the planet to the host star.[6]

The HAT-P-28 planetary system[6][3]
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. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. ^ a b c d e 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. ^ a b c d e f g h i j k l Buchhave, L. A.; Bakos, G. Á.; Hartman, J. D.; Torres, G.; Latham, D. W.; Andersen, J.; Kovács, G.; Noyes, R. W.; Shporer, A.; Esquerdo, G. A.; Fischer, D. A.; Johnson, J. A.; Marcy, G. W.; Howard, A. W.; Béky, B.; Sasselov, D. D.; Fűrész, G.; Quinn, S. N.; Stefanik, R. P.; Szklenár, T.; Berlind, P.; Calkins, M. L.; Lázár, J.; Papp, I.; Sári, P. (2011), "HAT-P-28b AND HAT-P-29b: TWO SUB-JUPITER MASS TRANSITING PLANETS", The Astrophysical Journal, 733 (2): 116, arXiv:1103.1813, Bibcode:2011ApJ...733..116B, doi:10.1088/0004-637X/733/2/116, S2CID 119293967
  4. ^ a b "HAT-P-28". SIMBAD. Centre de données astronomiques de Strasbourg.
  5. ^ a b Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad; Howard, Andrew W.; Johnson, John A.; Mawet, Dimitri; Morton, Timothy D.; Muirhead, Philip S.; Wang, Ji (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, arXiv:1606.07102, Bibcode:2016ApJ...827....8N, doi:10.3847/0004-637X/827/1/8, S2CID 41083068
  6. ^ a b c 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, arXiv:1802.05269, Bibcode:2018AJ....155..165P, doi:10.3847/1538-3881/aaaf71, PMC 6510550, PMID 31080254, S2CID 64370118
  7. ^ 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, arXiv:1409.0572, Bibcode:2014A&A...569A..89M, doi:10.1051/0004-6361/201322956, S2CID 10038821
  8. ^ Wöllert, Maria; Brandner, Wolfgang (2015), "A Lucky Imaging search for stellar sources near 74 transit hosts", Astronomy & Astrophysics, 579: A129, arXiv:1506.05456, Bibcode:2015A&A...579A.129W, doi:10.1051/0004-6361/201526525, S2CID 118903879


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