Astronomy:NGTS-6
NGTS-6 is a star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 14.12,[1] making it readily visible in telescopes with an aperture of at least 203 millimeters; it can also be viewed in telescopes with an aperture between 152 and 203 mm, albeit faintly. The star is located relatively far at a distance of 1,002 light years based on parallax measurements from the Gaia spacecraft,[2] but it is drifting closer with a heliocentric radial velocity of −19.14 km/s.[3]
NGTS-6 is a K-type main sequence star that has 76.7% the mass of the Sun and 75.4% of the Sun's radius.[3] However, it only radiates 25.6% of the Sun's luminosity[3] from its photosphere at an effective temperature of 4,730 K,[3] giving it an orange hue when viewed in a telescope. It is metal enriched with of the Sun's abundance of iron.[3] Such stars are more likely to form giant planets. NGTS-6 is estimated to be 9.77 billion years old and it spins modestly with a projected rotational velocity of 2.85 km/s.[3]
Planetary system
In 2018, a ultra-hot Jupiter was discovered orbiting the star based on transit data from the Next Generation Transit Survey. It was confirmed a year later based on doppler spectroscopy data from CORALIE and FEROS. NGTS-6b orbits extremely closely to its host star within a 21.17 hour period, making it an ultra-short period planet. The planet is 33.9% more massive than Jupiter, but it is 32.6% larger as a result of tidal heating from its close proximity.[3] The system was included in a 2024 survey as a potential target for studying the orbital decay of exoplanets.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (hours) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| NGTS-6b | 1.339±0.028 MJ | 0.01677±0.00032 | 21.169404±0.00000792 | 0.00 (fixed) | 78.231+0.262−0.210° | 1.326+0.097−0.112 RJ |
References
- ↑ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (January 14, 2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal 145 (2): 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z.
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Vines, Jose I et al. (November 2019). "NGTS-6b: an ultrashort period hot-Jupiter orbiting an old K dwarf". Monthly Notices of the Royal Astronomical Society 489 (3): 4125–4134. doi:10.1093/mnras/stz2349. ISSN 0035-8711. Bibcode: 2019MNRAS.489.4125V.
- ↑ Weinberg, Nevin N.; Davachi, Niyousha; Essick, Reed; Yu, Hang; Arras, Phil; Belland, Brent (January 2024). "Orbital Decay of Hot Jupiters due to Weakly Nonlinear Tidal Dissipation". The Astrophysical Journal 960 (1): 50. doi:10.3847/1538-4357/ad05c9. ISSN 0004-637X. Bibcode: 2024ApJ...960...50W.
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