Astronomy:NGTS-1
NGTS-1, also designated as TOI-551 is a solitary star located in the southern constellation Columba, the dove. With an apparent magnitude of 15.52,[1] NGTS-1 can only be seen through a powerful telescope. Gaia DR3 parallax measurements imply a distance of 710 light-years[2] and it is drifting away rapidly with a heliocentric radial velocity of 97.2 km/s.[3]
Properties
NGTS-1 has a stellar classification of M0.5, indicating that is an early M-type star. It has 61% of the mass of the Sun and over half of its radius.[3] Since red dwarfs are fully convective, they do not burn as much as more massive stars. As a result, NGTS-1 only radiates 7.02% of the luminosity of the Sun from its photosphere at an effective temperature of 3,916 K.[3] There was difficulty determining the metallicity of the object due to its faintness, but NGTS-1 is assumed to be around solar metallicity.[3] In addition, this also provided some uncertainty about the star's properties since red dwarfs properties are dependent on their metallicity. It spins too slowly for it to be measured accurately, having a projected rotational velocity lower than 1.0 km/s.[3]
Planetary system
The discovery of a hot Jupiter orbiting the star was reported in 2017 as part of the Next Generation Transit Survey.[3] The media also dubbed NGTS-1b as "monstrous" since the planet is relatively large compared to its host star.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.812+0.066 −0.075 MJ |
0.0326+0.0047 −0.0045 |
2.6473068±0.0000017[5] | 0.016+0.023 −0.012 |
85.27+0.61 −0.73° |
1.33+0.61 −0.33 RJ |
References
- ↑ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2013-02-01). "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 Bayliss, Daniel; Gillen, Edward; Eigmuller, Philipp; McCormac, James; Alexander, Richard D.; Armstrong, David J.; Booth, Rachel S.; Bouchy, Francois et al. (April 21, 2018). "NGTS-1b: A hot Jupiter transiting an M-dwarf". Monthly Notices of the Royal Astronomical Society 475 (4): 4467–4475. doi:10.1093/mnras/stx2778. ISSN 0035-8711. Bibcode: 2018MNRAS.475.4467B.
- ↑ "NGTS-1b – Scientists Find a Baffling New Monster Planet" (in en-US). 2017-11-06. https://factslegend.org/ngts-1b-hot-jupiter-baffling-new-monster-planet/.
- ↑ Kokori, A. et al. (March 1, 2023). "ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations". The Astrophysical Journal Supplement Series 265 (1): 4. doi:10.3847/1538-4365/ac9da4. ISSN 0067-0049. Bibcode: 2023ApJS..265....4K.
Cite error: <ref> tag with name "GaiaDR2" defined in <references> is not used in prior text.
Cite error: <ref> tag with name "Denis2005" defined in <references> is not used in prior text.
<ref> tag with name "Roman1987" defined in <references> is not used in prior text.
 |  |
