KELT-3

KELT-3 is a star in the zodiac constellation Leo. With an apparent magnitude of 9.82, it is too faint to be seen with the naked eye, but can be detected using a telescope. It is currently located around 690 light years away, based on parallax measurements.

KELT-3
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo
Right ascension 09h 54m 34.39s[1]
Declination +40° 23′ 16.98″[1]
Apparent magnitude (V) 9.82 ± 0.03[2]
Characteristics
Evolutionary stage main sequence star
Spectral type F6V
Variable type planetary transit
Astrometry
Proper motion (μ) RA: -28.328 ± 0.198 mas/yr[1]
Dec.: -24.411 ± 0.227 mas/yr[1]
Parallax (π)4.7315 ± 0.1213 mas[1]
Distance690 ± 20 ly
(211 ± 5 pc)
Details[3]
Mass1.301±0.046 M☉
Radius1.583±0.036 R☉
Luminosity3.04[4] L☉
Surface gravity (log g)4.153±0.024 cgs
Temperature6306+36
−35 K
Metallicity [Fe/H]0.030+0.072
−0.066 dex
Age3.0 ± 0.2[4] Gyr
Other designations
BD+41 2024, TYC 2996-683-1, 2MASS J09543439+4023170, GSC 02996-00683, SAO 43097
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

Properties

KELT-3 is an early F-type main-sequence star with 27.7% more mass than the Sun, and is slightly larger than the latter. It is radiating 3 times the Sun's luminosity, and has a metallicity similar to the latter. It has an effective temperature of 6,304 K, which gives KELT-3 a yellow-white hue. It's also slightly younger than the Sun, with an age of 3 billion years. There is uncertainty about the star's age, it being an evolved star or not.[4]

Since 2015, the star is suspected to have a stellar companion, at angular separation of 3.762±0.009 arcseconds.[5]

Planetary system

In 2013, KELT discovered an eccentric hot Jupiter transiting the star. In the research paper, it is stated as one of the brightest transiting hosts. The light curves of the star have been observed during transits.[4]

The KELT-3 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.94±0.33[6] MJ 0.04120 ± 0.00067 2.7033902 0.202 84.25° 1.458+0.042
−0.041[3] RJ

See also

References
  1. Gaia Collaboration (2018-04-01). "VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)". VizieR Online Data Catalog. 1345. Bibcode:2018yCat.1345....0G.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Wang, Xian-Yu; Wang, Yong-Hao; Wang, Songhu; Wu, Zhen-Yu; Rice, Malena; Zhou, Xu; Hinse, Tobias C.; Liu, Hui-Gen; Ma, Bo; Peng, Xiyan; Zhang, Hui; Yu, Cong; Zhou, Ji-Lin; Laughlin, Gregory (2021), "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves", The Astrophysical Journal Supplement Series, 255: 15, arXiv:2105.14851, doi:10.3847/1538-4365/ac0835, S2CID 235253975
  4. Pepper, Joshua; Siverd, Robert J.; Beatty, Thomas G.; Gaudi, B. Scott; Stassun, Keivan G.; Eastman, Jason; Collins, Karen; Latham, David W.; Bieryla, Allyson; Buchhave, Lars A.; Jensen, Eric L. N. (2013-08-01). "KELT-3b: A Hot Jupiter Transiting a V = 9.8 Late-F Star". The Astrophysical Journal. 773 (1): 64. arXiv:1211.1031. Bibcode:2013ApJ...773...64P. doi:10.1088/0004-637X/773/1/64. ISSN 0004-637X. S2CID 14691090.
  5. 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
  6. Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2016), "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes", The Astronomical Journal, 153 (3): 136, arXiv:1609.04389, Bibcode:2017AJ....153..136S, doi:10.3847/1538-3881/aa5df3, S2CID 119219062
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