XO-3
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 04h 21m 52.7048s[2] |
| Declination | +57° 49′ 01.889″[2] |
| Apparent magnitude (V) | 9.80 ± 0.03[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F5V[3] |
| Apparent magnitude (B) | 10.25 ± 0.03[3] |
| Apparent magnitude (V) | 9.80 ± 0.03[3] |
| Apparent magnitude (J) | 9.013 ± 0.029[4] |
| Apparent magnitude (H) | 8.845 ± 0.018[4] |
| Apparent magnitude (K) | 8.791 ± 0.019[4] |
| Astrometry | |
| Radial velocity (Rv) | −11.14±0.47[2] km/s |
| Proper motion (μ) | RA: −2.721(27) mas/yr[2] Dec.: 4.186(23) mas/yr[2] |
| Parallax (π) | 4.8687±0.0261 mas[2] |
| Distance | 670 ± 4 ly (205 ± 1 pc) |
| Details[5] | |
| Mass | 1.449+0.056 −0.058 M☉ |
| Radius | 1.523±0.027 R☉ |
| Luminosity | 4.92+0.40 −0.34 L☉ |
| Surface gravity (log g) | 4.234+0.013 −0.014 cgs |
| Temperature | 6970+110 −100 K |
| Metallicity [Fe/H] | −0.159+0.058 −0.069 dex |
| Rotational velocity (v sin i) | 18.63±0.24 km/s |
| Age | 0.97+0.36 −0.29 Gyr |
| Other designations | |
| XO-3, BD+57 793, TOI-1676, TIC 8400842, TYC 3727-1064-1, GSC 03727-01064, 2MASS J04215269+5749018[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
XO-3 is a star 670 light-years (210 parsecs) away in the constellation Camelopardalis. The star has a magnitude of 10 and is not visible to the naked eye but is visible through a small telescope.[3] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.[7]
Planetary system
In 2007, the gas giant exoplanet XO-3b was discovered by the XO Telescope using the transit method. This object may be classified as a brown dwarf because of its high mass, near the ~13 MJ limit for deuterium fusion.[3][8] The planetary orbit is misaligned with the stellar rotation,[9][10] which is unusual for such a massive planet.[5] The misalignment may be due to an undetected companion star.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 13.27+0.35 −0.36 MJ |
0.04815+0.00061 −0.00065 |
3.19152309(14) | 0.2791+0.0024 −0.0022 |
83.66±0.17° | 1.320±0.025 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 f 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 d e f Johns-Krull, Christopher M.; et al. (2008). "XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star". The Astrophysical Journal. 677 (1): 657–670. arXiv:0712.4283. Bibcode:2008ApJ...677..657J. doi:10.1086/528950. S2CID 15342571.
- ^ a b c Cutri; et al. (2003). "2MASS===04215269+5749018". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-25.
- ^ a b c d Rusznak, Jace; Wang, Xian-Yu; Rice, Malena; Wang, Songhu (April 2025). "From Misaligned Sub-Saturns to Aligned Brown Dwarfs: The Highest Mp/M* Systems Exhibit Low Obliquities, Even around Hot Stars". The Astrophysical Journal Letters. 983 (2): L42. arXiv:2412.04438. Bibcode:2025ApJ...983L..42R. doi:10.3847/2041-8213/adc129.
- ^ "SIMBAD query result: TYC 3727-1064-1 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2012-02-25.
- ^ Adams, E. R.; et al. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal. 146 (1). 9. arXiv:1305.6548. Bibcode:2013AJ....146....9A. doi:10.1088/0004-6256/146/1/9. S2CID 119117620.
- ^ "XO-3b: Supersized planet or oasis in the 'brown dwarf desert'?" (Press release). Houston, Texas: Rice University. 2007-06-30. Retrieved 2022-01-01.
- ^ Winn, Joshua N.; et al. (2009). "On the Spin-Orbit Misalignment of the XO-3 Exoplanetary System". The Astrophysical Journal. 700 (1): 302–308. arXiv:0902.3461. Bibcode:2009ApJ...700..302W. doi:10.1088/0004-637X/700/1/302. S2CID 2358804.
- ^ Hirano, Teruyuki; et al. (2011). "Further Observations of the Tilted Planet XO-3: A New Determination of Spin-Orbit Misalignment, and Limits on Differential Rotation". Publications of the Astronomical Society of Japan. 63 (6): L57–L61. arXiv:1108.4493. Bibcode:2011PASJ...63L..57H. doi:10.1093/pasj/63.6.l57. S2CID 16909722.
Further reading
- Winn, Joshua N.; et al. (2008). "The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b". The Astrophysical Journal. 683 (2): 1076–1084. arXiv:0804.4475. Bibcode:2008ApJ...683.1076W. doi:10.1086/589737. S2CID 119266744.