TYC 8998-760-1

TYC 8998-760-1 is a young star, about 27 Myr old, located 310 light years away in the constellation of Musca, with a mass 1.00±0.02 times the Sun.

TYC 8998-760-1

TYC 8998-760-1, accompanied by two giant exoplanets, TYC 8998-760-1b and TYC 8998-760-1c[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Musca
Right ascension	13h 25m 12.1263s[2]
Declination	−64° 56′ 20.689″[2]
Apparent magnitude (V)	11.19[3]
Characteristics
Evolutionary stage	Pre-main sequence[4]
Spectral type	K3IV[5]
Astrometry
Radial velocity (Rv)	12.84[6] km/s
Proper motion (μ)	RA: −40.996[2] mas/yr Dec.: −17.734[2] mas/yr
Parallax (π)	10.6124 ± 0.0116 mas[2]
Distance	307.3 ± 0.3 ly (94.2 ± 0.1 pc)
Details
Mass	1.00[4] M☉
Radius	1.01[2] R☉
Luminosity	0.508[2] L☉
Surface gravity (log g)	4.4[2] cgs
Temperature	4,862[2] K
Age	27[7] Myr
Other designations
TIC 449888653, 2MASS J13251211-6456207
Database references
SIMBAD	data

Planetary system

There are two giant bodies orbiting the star. The European Southern Observatory's Very Large Telescope photographed the two bodies using its SPHERE instrument, producing the first direct image of multiple bodies orbiting a Sun-like star.^[1][8]

The TYC 8998-760-1 planetary system^[7][4][9]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (years)	Eccentricity	Inclination	Radius
b	21.8±3 MJ	162	4,500	0 (assumed)	—	3.0+0.2 −0.7 RJ
c	7.2±0.7 MJ	320	5,700	0 (assumed)	—	1.1+0.6 −0.3 RJ

TYC 8998-760-1 b

TYC 8998-760-1 b is a body which has a mass 21.8 times that of Jupiter (most likely making it a brown dwarf), and a radius of 3 R_J. It orbits at a distance of 162 AU (2.42×10¹⁰ km; 1.51×10¹⁰ mi), or slightly more than 5 times the Neptune-Sun distance.^[4][10][7] In July 2021, astronomers reported the detection, for the first time, of an isotope in the atmosphere of an exoplanet; more specifically, the isotope Carbon-13 (C¹³) was found in the atmosphere.^[11][12]

TYC 8998-760-1 c

TYC 8998-760-1 c is a body with a mass of 7.2 M_J, and orbits at 320 AU (4.8×10¹⁰ km; 3.0×10¹⁰ mi), or slightly more than 11 times the Neptune-Sun distance.^[4][7]

References

1. ESO/Bohn (22 July 2020). "First ever image of a multi-planet system around a Sun-like star (uncropped, with annotations)". ESO. European Southern Observatory. Archived from the original on 24 July 2020. Retrieved 24 July 2020.
2. 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.
3. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
4. Bohn, Alexander (22 July 2020). "Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1". The Astrophysical Journal Letters. 898 (1): L16. arXiv:2007.10991. Bibcode:2020ApJ...898L..16B. doi:10.3847/2041-8213/aba27e. S2CID 220686536.
5. "TYC 8998-760-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 July 2020.
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.
7. Wood, Mackenna L.; et al. (2023). "TESS Hunt for Young and Maturing Exoplanets (THYME). IX. A 27 Myr Extended Population of Lower Centaurus Crux with a Transiting Two-planet System". The Astronomical Journal. 165 (3): 85. arXiv:2212.03266. Bibcode:2023AJ....165...85W. doi:10.3847/1538-3881/aca8fc. S2CID 254366258.
8. Wall, Mike (22 July 2020). "Multiplanet system around sunlike star photographed for 1st time ever - The two newly imaged planets are huge — 14 and 6 times more massive than Jupiter". Space.com. Retrieved 22 July 2020.
9. Planet TYC 8998-760-1 b at exoplanets.eu
10. "Astronomers Directly Image Two Giant Exoplanets around Young Sun-Like Star | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2020-07-25.
11. Starr, Michelle (14 July 2021). "Isotopes Detected in The Atmosphere of an Exoplanet For The First Time". ScienceAlert. Retrieved 14 July 2021.
12. Zhang, Yapeng; et al. (14 July 2021). "The 13CO-rich atmosphere of a young accreting super-Jupiter". Nature. 595 (7867): 370–372. arXiv:2107.06297. Bibcode:2021Natur.595..370Z. doi:10.1038/s41586-021-03616-x. ISSN 0028-0836. PMID 34262209. S2CID 235829633. Retrieved 14 July 2021.