HAT-P-28

HAT-P-28
Observation data; Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	00h 52m 00.1876s
Declination	+34° 43′ 42.205″
Apparent magnitude (V)	13.03
Characteristics
Evolutionary stage	main-sequence star
Spectral type	G
Astrometry
Radial velocity (Rv)	48.06 km/s
Proper motion (μ)	RA: 25.615(14) mas/yr ; Dec.: 2.712(11) mas/yr
Parallax (π)	2.4728 ± 0.0156 mas
Distance	1,319 ± 8 ly ; (404 ± 3 pc)
Orbit
Primary	HAT-P-28
Companion	HAT-P-28 B
Semi-major axis (a)	0.994±0.002"; (404 AU)
Details
Mass	1.02±0.05 M☉
Radius	1.10+0.09; −0.07 R☉
Luminosity	1.13+0.23; −0.16 L☉
Surface gravity (log g)	4.36±0.06 cgs
Temperature	5680±90 K
Metallicity [Fe/H]	0.12±0.08 dex
Rotational velocity (v sin i)	0.2+0.5; −0.2 km/s
Age	6.1+2.6; −1.9 Gyr
Other designations
	Gaia DR2 363702817083391232, GSC 02284-00503, 2MASS J00520018+3443422
Database references
SIMBAD	data

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 $M$ _J	0.0434±0.0007	3.257215±0.000007	0.051±0.033	88.0±0.9°	1.190^+0.102 _−0.075 $R$ _J

References

^ ^a ^b ^c ^d 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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
^ ^a ^b "HAT-P-28". SIMBAD. Centre de données astronomiques de Strasbourg.
^ ^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
^ ^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
^ 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
^ 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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[Gaia_DR3-1] 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.

[Buchhave2011-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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

[simbad-3] "HAT-P-28". SIMBAD. Centre de données astronomiques de Strasbourg.

[Ngo2016-4] 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

[Penev2018-5] 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

[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, arXiv:1409.0572, Bibcode:2014A&A...569A..89M, doi:10.1051/0004-6361/201322956, S2CID 10038821

[7] 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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Observation data Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	00^h 52^m 00.1876^s^[1]
Declination	+34° 43′ 42.205″^[1]
Apparent magnitude (V)	13.03^[2]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	G
Astrometry

Radial velocity (R_v)	48.06^[3] km/s
Proper motion (μ)	RA: 25.615(14) mas/yr^[1] Dec.: 2.712(11) mas/yr^[1]
Parallax (π)	2.4728 ± 0.0156 mas^[1]
Distance	1,319 ± 8 ly (404 ± 3 pc)

Orbit^[4]
Primary	HAT-P-28
Companion	HAT-P-28 B
Semi-major axis (a)	0.994±0.002" (404 AU)
Details^[5]

Mass	1.02±0.05 `M`_☉
Radius	1.10^+0.09 _−0.07 `R`_☉
Luminosity	1.13^+0.23 _−0.16^[2] `L`_☉
Surface gravity (log g)	4.36±0.06^[2] cgs
Temperature	5680±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
Age	6.1^+2.6 _−1.9^[2] Gyr

Other designations
Gaia DR2 363702817083391232, GSC 02284-00503, 2MASS J00520018+3443422^[3]
Database references
SIMBAD	data