KELT-24
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.
KELT-24 has a single known exoplanet, a hot Jupiter only 11 R☉ from the star.
Nomenclature
[edit]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
[edit]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
[edit]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]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.6 MJ | 0.0501 | 5.5515 | 0.032 | 89.7° | 1.1 RJ |
References
[edit]- ^ a b 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.
- ^ a b c d e f 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ a b c d e f g h i 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.
- ^ a b "KELT-24". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-05-27.
- ^ 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.
- ^ Rodriguez, Joseph E.; et al. (23 October 2019). "KELT-24b: A 5M J 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.
- ^ 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.
- ^ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. 13 September 2019. Retrieved 10 September 2023.
External links
[edit]- KELT-24 NASA Exoplanet Archive
