TOI-791
.jpg) Artistic representation of TOI-791 system | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Volans |
| Right ascension | 07h 53m 44.36s[1] |
| Declination | −69° 42′ 06.4″[1] |
| Apparent magnitude (V) | 11.09±0.07[2] |
| Characteristics | |
| Evolutionary stage | Main-sequence[3] |
| Spectral type | F4V[3] |
| Astrometry | |
| Radial velocity (Rv) | +6.24±0.95[1] km/s |
| Proper motion (μ) | RA: −5.139±0.015 mas/yr[1] Dec.: +8.285±0.017 mas/yr[1] |
| Parallax (π) | 2.9719±0.0128 mas[1] |
| Distance | 1,097 ± 5 ly (336 ± 1 pc) |
| Details | |
| Mass | 1.43[4] M☉ |
| Radius | 1.43[4] R☉ |
| Luminosity | 3.77[4] L☉ |
| Surface gravity (log g) | 4.28[4] cgs |
| Temperature | 6,727[4] K |
| Metallicity [Fe/H] | –0.14[5] dex |
| Other designations | |
| TOI-791, TIC 306472057, TYC 9184-1675-1, GSC 09184-01675, 2MASS J07534434-6942063, Gaia DR3 5270467966514084224[6] | |
| Database references | |
| SIMBAD | data |
TOI-791 is an F-type main-sequence star located approximately 1,113 light-years from Earth in the constellation of Volans.[7] At a visual apparent magnitude of 11.1, it is too faint to be seen with the naked eye.[5] It has 1.43 times the Solar mass and 1.43 times the Solar radius while its [Fe/H] metallicity index is about −0.14, indicating an iron-to-hydrogen ratio 72% that of the Sun.[a][5][4] It hosts two known transiting exoplanets.[5][8]
Planetary system
[edit]In 2026, using the transit method, two giant planets were confirmed around TOI-791, which had been previously identified as candidates from TESS. The inner planet TOI-791 b has orbital period of 139 days while the outer TOI-791 c has orbital period of 232 days.[5][8] Based on the transit-timing-variation (TTV) phenomenon, the masses and densities of both planets can be measured, indicating that these planets are super-puffs with the lowest densities among all known exoplanets. The discovery and follow-up studies of TOI-791 b and TOI-791 c might give insights into how super-puff planets form and evolve.[5][8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 0.030±0.005 MJ | 0.602±0.022 | 139.29931+0.00011 −0.00012 |
0.032+0.014 −0.032 |
89.797±0.039 | 0.993±0.033 RJ |
| c | 0.058±0.007 MJ | 0.863±0.032 | 232.01570+0.00067 −0.00071 |
0.028+0.013 −0.028 |
89.695±0.013 | 1.155±0.040 RJ |
See also
[edit]Notes
[edit]- ↑ 10−0.14 ≈ 0.72
References
[edit]- 1 2 3 4 5 6 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.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
- 1 2 Huang, Sarah; Jiang, Chen (2025-11-30). "Machine Learning for Exoplanet Discovery: Validating TESS Candidates and Identifying Planets in the Habitable Zone". arXiv:2512.00967 [astro-ph.EP].
- 1 2 3 4 5 6 Stassun, Keivan G.; et al. (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.
- 1 2 3 4 5 6 7 Dransfield, Georgina (June 2026). "ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791". Monthly Notices of the Royal Astronomical Society. 549 (4) stag864. arXiv:2606.30016. doi:10.1093/mnras/stag864.
- ↑ "TOI-791". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2026-06-27.
- ↑ "NASA's TESS Mission Reveals the "Puffiest" Planets Ever Found - NASA Science". 2026-06-24. Retrieved 2026-06-27.
- 1 2 3 "Two 'super-puff' cotton candy exoplanets are the lightest gas giants ever discovered". space.com. 25 June 2026. Retrieved 26 June 2026.
