KELT-1

KELT-1
Observation data
Epoch J2000      Equinox ICRS
Constellation Andromeda
Right ascension 00h 01m 26.9168s
Declination +39° 23′ 01.784″
Apparent magnitude (V) 10.63
Characteristics
Evolutionary stage main sequence
Spectral type F5
Astrometry
Radial velocity (Rv)1.296 km/s
Proper motion (μ) RA: −9.696 mas/yr
Dec.: −7.823 mas/yr
Parallax (π)3.6836±0.0144 mas
Distance885 ± 3 ly
(271 ± 1 pc)
Position (relative to KELT-1)
ComponentKELT-1B
Epoch of observation2012
Angular distance0.588±0.001″
Position angle157.4±0.2°
Projected separation154±8 AU
Details
Mass1.369+0.071
−0.075 M☉
Radius1.501±0.036 R☉
Luminosity3.56+0.22
−0.21 L☉
Surface gravity (log g)4.221+0.018
−0.017 cgs
Temperature6,471+50
−49 K
Metallicity [Fe/H]+0.095±0.080 dex
Rotational velocity (v sin i)55 km/s
Age1.65+0.89
−0.65 Gyr
Other designations
TOI-1476, TYC 2785-2130-1, GSC 02785-02130, 2MASS J00012691+3923017
Database references
SIMBADdata

KELT-1 is a F-type main-sequence star. Its surface temperature is 6518±50 K. It is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.008±0.073, but is much younger at an age of 1.75±0.25 billion years. The star is rotating very rapidly.

A red dwarf stellar companion at a projected separation of 154±8 AU was detected in 2012, simultaneously with a planetary companion.

Planetary system

The star was found to be orbited by a low-mass brown dwarf or giant planet in 2012.

The atmosphere of the brown dwarf KELT-1b has been extensively measured from space- and ground-based observatories by a team of astronomers led by Thomas Beatty. They found that KELT-1b has an equilibrium temperature of 2422+32
−26 K, but features a very strong contrast between measured dayside and nightside temperatures. Dayside temperature appears to be 3340±110 K, while nightside temperature is 1173+175
−130 K. The excess dayside temperature may be an artifact arising from highly reflective (dayside albedo reaching 0.5, which is unusual for hot planets and brown dwarfs) rock-vapor clouds. Also, the brightest band is shifted eastward from the subsolar point by 18.3±7.4°.

KELT-1b's density of 22.1+5.62
−9.16 g/cm3 is the highest among well characterized planets.

The planetary orbit is well aligned with the equatorial plane of the star, with the misalignment angle equal to 2±16°. Despite the short orbital period, orbital decay of KELT-1b has not been detected as of 2018.

The KELT-1 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b 27.7+1.0
−1.1 MJ		 0.02494+0.00042
−0.00046		 1.217493996(81) 0.0055+0.0084
−0.0039		 85.27+1.10
−0.85		 1.138±0.030 RJ

See also

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. 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. Bibcode:2000A&A...355L..27H.
  4. ↑ Su, Tianhao; Zhang, Li-yun; Long, Liu; Han, Xianming L.; Misra, Prabhakar; Meng, Gang; Pi, Qingfeng; Yang, Zilu; Yang, Jiawei (2022). "Magnetic Activity and Physical Parameters of Exoplanet Host Stars Based on LAMOST DR7, TESS, Kepler, and K2 Surveys". The Astrophysical Journal Supplement Series. 261 (2): 26. Bibcode:2022ApJS..261...26S. doi:10.3847/1538-4365/ac7151.
  5. 1 2 3 4 5 6 7 Siverd, Robert J.; Beatty, Thomas G.; Pepper, Joshua; Eastman, Jason D.; Collins, Karen; Bieryla, Allyson; Latham, David W.; Buchhave, Lars A.; Jensen, Eric L. N.; Crepp, Justin R.; Street, Rachel; Stassun, Keivan G.; Scott Gaudi, B.; Berlind, Perry; Calkins, Michael L.; Depoy, D. L.; Esquerdo, Gilbert A.; Fulton, Benjamin J.; Fűrész, Gábor; Geary, John C.; Gould, Andrew; Hebb, Leslie; Kielkopf, John F.; Marshall, Jennifer L.; Pogge, Richard; Stanek, K. Z.; Stefanik, Robert P.; Szentgyorgyi, Andrew H.; Trueblood, Mark; et al. (2012), "KELT-1b: A STRONGLY IRRADIATED, HIGHLY INFLATED, SHORT PERIOD, 27 JUPITER-MASS COMPANION TRANSITING A MID-F STAR", The Astrophysical Journal, 761 (2): 123, arXiv:1206.1635, Bibcode:2012ApJ...761..123S, doi:10.1088/0004-637X/761/2/123, S2CID 118439102
  6. 1 2 Baştürk, Ö; Southworth, J.; Yalçınkaya, S.; Mancini, L.; Esmer, E. M.; Tekin, M.; Tezcan, F.; Evans, D. F.; Tezcan, C. T.; Bruni, I.; Yeşilyaprak, C. (2023-03-02). "Transit timing variation analysis of the low-mass brown dwarf KELT-1 b". Monthly Notices of the Royal Astronomical Society. 521 (1): 1200–1209. arXiv:2301.07619. doi:10.1093/mnras/stad248. ISSN 0035-8711.
  7. ↑ "KELT-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-18.
  8. 1 2 Beatty, Thomas G.; Wong, Ian; Fetherolf, Tara; Line, Michael R.; Shporer, Avi; Stassun, Keivan G.; Ricker, George R.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Louie, Dana R.; Schlieder, Joshua E.; Sha, Lizhou; Tenenbaum, Peter; Yahalomi, Daniel A. (2020), "The TESS phase curve of KELT-1b suggests a high dayside albedo", The Astronomical Journal, 160 (5): 211, arXiv:2006.10292, Bibcode:2020AJ....160..211B, doi:10.3847/1538-3881/abb5aa, S2CID 219792029
  9. ↑ Beatty, Thomas G.; Marley, Mark S.; Gaudi, B. Scott; Colón, Knicole D.; Fortney, Jonathan J.; Showman, Adam P. (2019), "Spitzer Phase Curves of KELT-1b and the Signatures of Nightside Clouds in Thermal Phase Observations", The Astronomical Journal, 158 (4): 166, arXiv:1808.09575, Bibcode:2019AJ....158..166B, doi:10.3847/1538-3881/ab33fc, S2CID 119055976
  10. ↑ Johns, Daniel; Marti, Connor; Huff, Madison; McCann, Jacob; Wittenmyer, Robert A.; Horner, Jonathan; Wright, Duncan J. (2018), "Revised Exoplanet Radii and Habitability Using Gaia Data Release 2", The Astrophysical Journal Supplement Series, 239 (1): 14, arXiv:1808.04533, Bibcode:2018ApJS..239...14J, doi:10.3847/1538-4365/aae5fb, S2CID 119503072
  11. ↑ Maciejewski, G.; Fernández, M.; Aceituno, F.; Martín-Ruiz, S.; Ohlert, J.; Dimitrov, D.; Szyszka, K.; von Essen, C.; Mugrauer, M.; Bischoff, R.; Michel, K. -U.; Mallonn, M.; Stangret, M.; Moździerski, D. (2018), "Planet-star interactions with precise transit timing. I. The refined orbital decay rate for WASP-12 b and initial constraints for HAT-P-23 b, KELT-1 b, KELT-16 b, WASP-33 b, and WASP-103 b", Acta Astronomica, 68 (4): 371, arXiv:1812.02438, Bibcode:2018AcA....68..371M, doi:10.32023/0001-5237/68.4.4, S2CID 118895482