NGTS-3

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NGTS-3
Observation data
Epoch J2000       Equinox J2000
Constellation Columba [1]
Right ascension 06h 17m 46.75s [2]
Declination −35° 42′ 23.05″ [2]
Apparent magnitude  (V)14.67±0.01 [3]
Characteristics
Spectral type G6 V + K1 V
B−V color index +0.77 [3]
R−I color index +0.36 [3]
Astrometry
Radial velocity (Rv)8.57±0.05 [4] km/s
Proper motion (μ)RA: -8.838 [2] mas/yr
Dec.: +8.771 [2] mas/yr
Parallax (π)1.3153±0.0193  mas [2]
Distance 2,480 ± 40  ly
(760 ± 10  pc)
Details [4]
A
Mass 1.02±0.09  M☉
Radius 0.93±0.23  R☉
Luminosity 0.72±0.03 [2]   L☉
Surface gravity (log g)4.45 [5]   cgs
Temperature 5,600±150  K
Metallicity [Fe/H]0.12±0.15  dex
Rotational velocity (v sin i)1.0±0.7 km/s
Other designations
Gaia DR2 2885350546895266432
Database references
SIMBAD data
Exoplanet Archive data

NGTS-3 is a star system located in the southern constellation Columba. With an apparent magnitude of 14.67, it requires a powerful telescope to observe. However, NGTS-3 is actually an unresolved spectroscopic binary system. The system is located approximately 2,480 light years away, based on parallax measurement, and is receding with a radial velocity of 8.57 km/s.

The system consists of two main sequence stars, classified as G6 and K1, respectively; however, only the properties of the primary star are known. NGTS-3A has a similar mass to that of the Sun, but is 7% smaller in radius. It radiates at 72% of the Sun's luminosity from its photosphere at an effective temperature of 5,600  K , which gives it the typical yellow hue characteristic of a G-type star.

Planetary System

In 2018, the NGTS survey discovered an inflated hot Jupiter orbiting NGTS-3A despite the components being visually unresolved. [4]

The NGTS-3A planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.38 ± 0.26  MJ 0.023+0.007
−0.005		1.6753728 ± 0.00000300?89.56+0.31
−0.48 ° 		1.48 ± 0.37  RJ

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 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.
  3. 1 2 3 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (February 2013). "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.
  4. 1 2 3 4 Günther, Maximilian N.; et al. (August 2018). "Unmasking the hidden NGTS-3Ab: a hot Jupiter in an unresolved binary system". Monthly Notices of the Royal Astronomical Society. 478 (4): 4720–4737. arXiv: 1805.01378 . Bibcode:2018MNRAS.478.4720G. doi: 10.1093/mnras/sty1193 . ISSN   0035-8711.
  5. ↑ Stassun, Keivan G.; et al. (October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . hdl: 1721.1/124721 . ISSN   0004-6256. S2CID   166227927.
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