HD 93396

Last updated
HD 93396
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 46m 49.74018s [1]
Declination −09° 23′ 56.4955″ [1]
Apparent magnitude  (V)8.04±0.01 [2]
Characteristics
Evolutionary stage Hertzsprung gap [3]
Spectral type G8/K0 IV [4]
B−V color index +0.83 [2]
Variable type planetary transit [5]
Astrometry
Radial velocity (Rv)34.96±0.24 [6]  km/s
Proper motion (μ)RA: −79.160  mas/yr [1]
Dec.: −78.507  mas/yr [1]
Parallax (π)10.0049 ± 0.0202  mas [1]
Distance 326.0 ± 0.7  ly
(100.0 ± 0.2  pc)
Absolute magnitude  (MV)+3.01 [7]
Details
Mass 1.43±0.07 [8]   M☉
Radius 2.93±0.15 [9]   R☉
Luminosity 6.01+0.13
−0.07 [1]   L☉
Surface gravity (log g)3.72+0.04
−0.05 [3]   cgs
Temperature 5,375±25 [10]   K
Metallicity [Fe/H]+0.17±0.05 [3]   dex
Rotational velocity (v sin i)1.8 [11]  km/s
Age 3.48±1.74 [8]   Gyr
Other designations
KELT-11, BD−08°2999, HD  93396, HIP  52733, SAO  137780, TOI-664, TIC  55092869 [12]
Database references
SIMBAD data

HD 93396 (HIP 52733; TOI-664; KELT-11) is a solitary star located in the equatorial constellation Sextans. It has an apparent magnitude of 8.04, [2] making it readily visible in binoculars, but not to the naked eye. The object is located relatively close at a distance of 326 light-years based on Gaia DR3 parallax measurements, [1] but it is receding with a heliocentric radial velocity of 34.96  km/s . [6] At its current distance, HD 93396's brightness is diminished by an interstellar extinction of 0.17 magnitudes [13] and it has an absolute magnitude of +3.01. [7]

HD 93396 has a stellar classification of G8/K0 IV, [4] indicating that it is an evolved star with the characteristics of a G8 and K0 subgiant. At the age of 3.48 billion years, it is currently in the Hertzsprung gap, [8] meaning that the star is in the process of ceasing hydrogen fusion at its stellar core and it is evolving towards the red giant branch. It has 1.43 times the mass of the Sun [8] and a slightly enlarged radius 2.93 times that of the Sun's. [9] It radiates 6.01 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 5,375  K , [10] giving it a yellowish-orange hue when viewed in the night sky. Like many planetary hosts, HD 93396 is metal enriched, having an iron abundance of [Fe/H] = +0.17 or 148% that of the Sun's. [3] It spins slowly with a projected rotational velocity of 1.8  km/s . [11]

Planetary system

In 2017, a sub-Saturn exoplanet was discovered transiting the star using the Kilodegree Extremely Little Telescope. It orbits very close to the star within a period of 4 days. [3] . Although the planet only has 17% the mass of Jupiter, it is 35% larger than the jovian planet, [10] making it one of the most inflated and least dense exoplanets. Subsequent observations revealed that the planet's atmosphere contains water vapor and a high abundance of titanium and aluminum oxides. [14]

The KELT-11/HD 93396 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
KELT-11b 0.171±0.015 [10]   MJ 0.0625+0.0030
−0.0029 [15] 		4.7362034±0.0000083 [16] 0 (fixed) [3] 85.8+2.4
−1.8 [3] ° 		1.35±0.10 [10]   RJ

Related Research Articles

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HD 85725, also known as HR 3916, is a yellow hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.29, placing it near the limit for naked eye visibility. The object is relatively close at a distance of 176 light-years, but is receding with a heliocentric radial velocity of 61.6 km/s.

HD 179079 is a star with an exoplanetary companion in the equatorial constellation of Aquila. It has an apparent visual magnitude of approximately 7.96, making it too faint to be readily visible to the naked eye. The distance to this star can be determine using parallax measurements, which yields an estimate of approximately 228 light years. It is drifting further away with a radial velocity of +20 km/s.

HD 191806 is a star located in the northern constellation Cygnus. With an apparent magnitude of 8.093, it's undetectable with the naked eye, but can be seen with binoculars. HD 191806 is currently placed at a distance of 215 light years based on parallax measurements and is drifting towards the Solar System with a spectroscopic radial velocity of −15.28 km/s.

HD 142245 is a hierarchical triple star system about 318 light-years away.

HD 116029 is a binary star system about 400 light-years away.

HD 108863 is a subgiant star, the primary of a binary star system 540 light-years away, belonging to spectral class K0. Its age is younger than the Sun's at 1.8±0.4 billion years. The primary star is slightly enriched in heavy elements, having 115% of solar abundance. The primary star does not have detectable flare activity.

HD 99706 is an orange-hued star in the northern circumpolar constellation of Ursa Major. With an apparent visual magnitude of 7.65, it is too dim to be visible to the naked eye but can be viewed with a pair of binoculars. Parallax measurements provide a distance estimate of approximately 480 light years from the Sun, and the Doppler shift shows it is drifting closer with a radial velocity of −30 km/s. It has an absolute magnitude of 2.12, indicating it would be visible to the naked eye as a 2nd magnitude star if it were located 10 parsecs away.

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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HD 39194 is a star located in the southern circumpolar constellation Mensa. It has an apparent magnitude of 8.07, making it readily visible in binoculars but not to the naked eye. The object is relatively close at a distance of 86 light years but is receding with a heliocentric radial velocity of 13.9 km/s.

HD 72945 and HD 72946 form a co-moving star system in the northern constellation of Cancer. HD 72945 is a binary star that is dimly visible to the naked eye as a point of light with an apparent visual magnitude of 5.91. At an angular separation of 10.10″ is the fainter companion star HD 72946 at magnitude 7.25. It is being orbited by a brown dwarf. The system as a whole is located at a distance of approximately 84 light years from the Sun based on parallax measurements.

HD 221420 is a likely binary star system in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.81, allowing it to be faintly seen with the naked eye. The object is relatively close at a distance of 102 light years but is receding with a heliocentric radial velocity of 26.5 km/s.

CD−34°8618, also known as KELT-13 or WASP-167, is a yellowish-white hued star located in the southern constellation of Centaurus. It has an apparent magnitude of 10.52, making it readily visible in medium sized telescopes, but not to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be approximately 1,350 light years away from the Solar System. It appears to be drifting closer to it, having a radial velocity of −0.53 km/s.

HR 8526, also known as HD 212168, is the primary of a triple star located in the southern circumpolar constellation Octans. The star and its companion have apparent magnitudes of 6.12 and 9.36 respectively. The system is located relatively close at a distance of 76 light years based on Gaia DR3 parallax measurements, but is receding with a heliocentric radial velocity of 15 km/s.

HD 200779 is a solitary star located in the equatorial constellation Equuleus, the foal. It has an apparent magnitude of 8.27, making it readily visible in binoculars but not to the naked eye. The object is located relatively close at a distance of 49 light years based on Gaia DR3 parallax measurements, and it is approaching rapidly with a heliocentric radial velocity of −67 km/s. It is classified as a high proper motion star, with a total proper motion of 569 mas/yr.

References

  1. 1 2 3 4 5 6 7 8 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.
  2. 1 2 3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "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. S2CID   17128864.
  3. 1 2 3 4 5 6 7 Pepper, Joshua; et al. (April 18, 2017). "KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V = 8 Subgiant HD 93396". The Astronomical Journal. 153 (5): 215. arXiv: 1607.01755v1 . Bibcode:2017AJ....153..215P. doi: 10.3847/1538-3881/aa6572 . S2CID   30219578.
  4. 1 2 Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars ; vol. 5. Bibcode:1999mctd.book.....H.
  5. ↑ "VSX : Detail for KELT-11". www.aavso.org.
  6. 1 2 Chubak, Carly; Marcy, G. (January 2011). "Accurate Radial Velocities of 2284 FGKM Stars and 127 Standards". American Astronomical Society. 43. Bibcode:2011AAS...21743412C. 434.12.
  7. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  8. 1 2 3 4 Ghezzi, L. (June 2018), "Retired A Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass", The Astrophysical Journal, 860 (2): 18, arXiv: 1804.09082 , Bibcode:2018ApJ...860..109G, doi: 10.3847/1538-4357/aac37c , S2CID   118969017
  9. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361. S2CID   6077801.
  10. 1 2 3 4 5 Beatty, Thomas G.; Stevens, Daniel J.; Collins, Karen A.; Colón, Knicole D.; James, David J.; Kreidberg, Laura; Pepper, Joshua; Rodriguez, Joseph E.; Siverd, Robert J.; Stassun, Keivan G.; Kielkopf, John F. (June 27, 2017). "Determining Empirical Stellar Masses and Radii from Transits and Gaia Parallaxes as Illustrated by Spitzer Observations of KELT-11b". The Astronomical Journal. 154 (1): 25. arXiv: 1612.04379 . Bibcode:2017AJ....154...25B. doi: 10.3847/1538-3881/aa7511 . ISSN   1538-3881. S2CID   119228276.
  11. 1 2 Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai (August 26, 2016). "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars". The Astrophysical Journal Supplement Series. 225 (2): 32. arXiv: 1606.07929 . Bibcode:2016ApJS..225...32B. doi: 10.3847/0067-0049/225/2/32 . ISSN   0067-0049. S2CID   118507965.
  12. ↑ "HD 93396". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 21, 2023.
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
  14. ↑ Colón, Knicole D.; Kreidberg, Laura; Line, Michael; Welbanks, Luis; Madhusudhan, Nikku; Beatty, Thomas; Tamburo, Patrick; Stevenson, Kevin B.; Mandell, Avi; Rodriguez, Joseph E.; Barclay, Thomas; Lopez, Eric D.; Stassun, Keivan G.; Angerhausen, Daniel; Fortney, Jonathan J.; James, David J.; Pepper, Joshua; Ahlers, John P.; Plavchan, Peter; Awiphan, Supachai; Kotnik, Cliff; McLeod, Kim K.; Murawski, Gabriel; Chotani, Heena; LeBrun, Danny; Matzko, William; Rea, David; Vidaurri, Monica; Webster, Scott; et al. (November 23, 2020). "An Unusual Transmission Spectrum for the Sub-Saturn KELT-11b Suggestive of a Subsolar Water Abundance". The Astronomical Journal. 160 (6): 280. arXiv: 2005.05153 . Bibcode:2020AJ....160..280C. doi: 10.3847/1538-3881/abc1e9 . S2CID   218581200.
  15. ↑ Changeat, Q.; Edwards, B.; Al-Refaie, A. F.; Morvan, M.; Tsiaras, A.; Waldmann, I. P.; Tinetti, G. (November 13, 2020). "KELT-11 b: Abundances of Water and Constraints on Carbon-bearing Molecules from the Hubble Transmission Spectrum". The Astronomical Journal. 160 (6): 260. arXiv: 2010.01310 . Bibcode:2020AJ....160..260C. doi: 10.3847/1538-3881/abbe12 . S2CID   222132941.
  16. ↑ Ivshina, Ekaterina S.; Winn, Joshua N. (April 8, 2022). "TESS Transit Timing of Hundreds of Hot Jupiters". The Astrophysical Journal Supplement Series. 259 (2): 62. arXiv: 2202.03401 . Bibcode:2022ApJS..259...62I. doi: 10.3847/1538-4365/ac545b . ISSN   0067-0049.
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