KELT-24

Last updated
KELT-24
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Ursa Major [1]
KELT-24
Right ascension 10h 47m 38.35063s [2]
Declination +71° 39′ 21.1525″ [2]
Apparent magnitude  (V)8.33 [3]
KELT-24B
Right ascension 10h 47m 38.38264s [4]
Declination +71° 39′ 19.1482″ [4]
Characteristics
KELT-24
Evolutionary stage main sequence [2]
Spectral type F5 [5]
Variable type planetary transit
KELT-24B
Evolutionary stage main sequence [6]
Spectral type M + M? [6]
Variable type eclipsing [6]
Astrometry
KELT-24
Radial velocity (Rv)−5.54±0.24 [2] km/s
Proper motion (μ)RA: −56.061 mas/yr [2]
Dec.: −34.526 mas/yr [2]
Parallax (π)10.3218±0.0180  mas [2]
Distance 316.0 ± 0.6  ly
(96.9 ± 0.2  pc)
Absolute magnitude  (MV)+3.47 [1]
KELT-24B
Proper motion (μ)RA: −49.897 mas/yr [4]
Dec.: −37.516 mas/yr [4]
Parallax (π)10.6799 ± 0.0892  mas [4]
Distance 305 ± 3  ly
(93.6 ± 0.8  pc)
Details [6]
KELT-24
Mass 1.31  M☉
Radius 1.51  R☉
Luminosity 3.54  L☉
Surface gravity (log g)4.19  cgs
Temperature 6,437  K
Metallicity [Fe/H]0.17  dex
Rotation ~4 days
Rotational velocity (v sin i)19.7 km/s
Age 2.8  Gyr
B
Mass 0.52  M☉
Radius 0.48  R☉
Luminosity 0.037  L☉
Surface gravity (log g)4.78  cgs
Temperature 3,630  K
Metallicity [Fe/H]0.30  dex
Age 2.8  Gyr
C
Mass 0.51  M☉
Radius 0.49  R☉
Luminosity0.038  L☉
Surface gravity (log g)4.77  cgs
Temperature 3,640  K
Metallicity [Fe/H]−0.31  dex
Age 2.8  Gyr
Other designations
MASCARA-3, KELT-24, HD 93148, HIP 52796 [7]
Database references
SIMBAD data
B

KELT-24 (HD 93148, MASCARA-3) is a multiple star system in the constellation Ursa Major at a distance of approximately 316 light-years (about 96.9 parsecs) from Sun. The apparent magnitude of the primary star is +8.33. The star's age is estimated to be about 2.8 billion years. As an F-type main-sequence star, it is similar to the Sun, but slightly hotter, larger, and more luminous.

Contents

KELT-24 has a single known exoplanet, a hot Jupiter only 11  R☉ from the star.

Nomenclature

This star was first catalogued in the Henry Draper Catalogue as HD 93148. The Henry Draper Catalogue gave stars visible to the naked eye in suitable conditions a designation, indicating that this star can be seen with the naked eye. But in 2019, the Multi-site All-Sky Camera and the Kilodegree Extremely Little Telescope announced the discovery of the exoplanet KELT-24b/MASCARA-3b around this star. Thus, it is most commonly known as KELT-24, although the star is sometimes catalogued as MASCARA-3. [6]

The common proper motion companion is referred to as HD 93148B or KELT-24B, [7] or KELT-24BC when it is being treated as a spectroscopic binary. [6]

Star system

KELT-24 is an 8th-magnitude F-type star with a faint companion separated by 2″ . The companion is over-luminous for a normal star of its colour and is suspected to be a binary consisting of two red dwarfs.

KELT-24 is a yellow-white star with a spectral class of F5. Its mass is about 1.3  M☉, its radius is about 1.5  R☉, and its luminosity is about 3.5  L☉. Its effective temperature is about 6,437  K . An age of 2.8 billion years has been calculated, but the 68% confidence interval ranges from 2.0 to 6.9 billion years. [6] Age estimates in the original discovery papers were 0.78 and 2.8 billion years respectively. [8] [9]

KELT-24B, or KELT-24BC when both components are being referred to, is suspected of being an eclipsing binary although only a single "transit-like event" has been observed. The best model fit is two near-identical red dwarfs each with a mass about half the Sun's and a luminosity less than 4% of the Sun's. [6]

Planetary system

In 2019, the discovery of the Hot Jupiter type planet KELT-24b/MASCARA-3b was announced by the Multi-site All-Sky CAmeRA and the Kilodegree Extremely Little Telescope. TESS data confirmed that no additional companions are orbiting this star. [10] [11]

The KELT-24 [6] planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b4.6  MJ 0.05015.55150.03289.7° 1.1  RJ

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 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. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  4. 1 2 3 4 5 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.
  5. ↑ Cannon, A. J.; Pickering, E. C. (1993). "VizieR Online Data Catalog: Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)". Vizier Online Data Catalog. Bibcode:1993yCat.3135....0C.
  6. 1 2 3 4 5 6 7 8 9 Giovinazzi, Mark R.; Cale, Bryson; Eastman, Jason D.; Rodriguez, Joseph E.; Blake, Cullen H.; Stassun, Keivan G.; Vanderburg, Andrew; Kunimoto, Michelle; Kraus, Adam L.; Twicken, Joseph; Beatty, Thomas G.; Dedrick, Cayla M.; Horner, Jonathan; Johnson, John A.; Johnson, Samson A.; McCrady, Nate; Plavchan, Peter; Sliski, David H.; Wilson, Maurice L.; Wittenmyer, Robert A.; Wright, Jason T.; Johnson, Marshall C.; Rose, Mark E.; Cornachione, Matthew (2024). "Trials and Tribulations in the Reanalysis of KELT-24 b: A Case Study for the Importance of Stellar Modeling". The Astronomical Journal. 168 (3): 118. arXiv: 2406.04288 . Bibcode:2024AJ....168..118G. doi: 10.3847/1538-3881/ad55ec .
  7. 1 2 "KELT-24". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-05-27.
  8. ↑ Hjorth, M.; Albrecht, S.; Talens, G. J. J.; Grundahl, F.; Justesen, A. B.; Otten, G. P. P. L.; Antoci, V.; Dorval, P.; Foxell, E.; Fredslund Andersen, M.; Murgas, F.; Palle, E.; Stuik, R.; Snellen, I. A. G.; Van Eylen, V. (2019). "MASCARA-3b. A hot Jupiter transiting a bright F7 star in an aligned orbit". Astronomy and Astrophysics. 631. arXiv: 1906.05254 . Bibcode:2019A&A...631A..76H. doi:10.1051/0004-6361/201936082.
  9. ↑ Rodriguez, Joseph E.; et al. (23 October 2019). "KELT-24b: A 5MJ Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148". The Astronomical Journal. 158 (5): 197. arXiv: 1906.03276 . Bibcode:2019AJ....158..197R. doi: 10.3847/1538-3881/ab4136 . ISSN   1538-3881.
  10. ↑ Maciejewski, G. (2020). "Search for Planets in Hot Jupiter Systems with Multi-Sector TESS Photometry. I. No Companions in Planetary Systems KELT-18, KELT-23, KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, and WASP-126". Acta Astronomica. 70 (3): 181. arXiv: 2010.11977 . Bibcode:2020AcA....70..181M. doi:10.32023/0001-5237/70.3.2. S2CID   225061977.
  11. ↑ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. 13 September 2019. Retrieved 10 September 2023.
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