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,[3] 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.[4]
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.[4] 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.[4] There was difficulty determining the metallicity of the object due to its faintness, but NGTS-1 is assumed to be around solar metallicity.[4] 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.[4]
Planetary system
The discovery of a hot Jupiter orbiting the star was reported in 2017 as part of the Next Generation Transit Survey.[4] The media also dubbed NGTS-1b as “monstrous” since the planet is relatively large compared to its host star.[7]
| 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[8] | 0.016+0.023 −0.012 |
85.27+0.61 −0.73° |
1.33+0.61 −0.33 RJ |
References
- ^ 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.
- ^ a b c d e 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.
- ^ a b c 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. arXiv:1212.6182. Bibcode:2013AJ….145…44Z. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. S2CID 119299381.
- ^ a b c d e f g h i j k Bayliss, Daniel; Gillen, Edward; Eigmuller, Philipp; McCormac, James; Alexander, Richard D.; Armstrong, David J.; Booth, Rachel S.; Bouchy, Francois; Burleigh, Matthew R.; Cabrera, Juan; Casewell, Sarah L. (April 21, 2018). “NGTS-1b: A hot Jupiter transiting an M-dwarf”. Monthly Notices of the Royal Astronomical Society. 475 (4): 4467–4475. arXiv:1710.11099. Bibcode:2018MNRAS.475.4467B. doi:10.1093/mnras/stx2778. ISSN 0035-8711.
- ^ Denis, Consortium (2005-09-01). “VizieR Online Data Catalog: The DENIS database (DENIS Consortium, 2005)”. VizieR Online Data Catalog: B/denis. Bibcode:2005yCat.2263….0D.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ “NGTS-1b – Scientists Find a Baffling New Monster Planet”. Facts Legend. 2017-11-06. Archived from the original on 2018-01-14. Retrieved 2021-02-18.
- ^ 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. arXiv:2209.09673. Bibcode:2023ApJS..265….4K. doi:10.3847/1538-4365/ac9da4. ISSN 0067-0049. S2CID 252383631.
