Astronomy:HAT-P-67
HAT-P-67 is a binary star system, made up of a F-type subgiant and a red dwarf star, which is located about 1,200 light-years away in the constellation Hercules. There is a hot Saturn planet orbiting the primary star, which is named HAT-P-67b.
Stellar system
The stellar system consists of the F class primary star with a red dwarf companion separated by 9 arc-seconds or about 3400 astronomical units.[1] According to measurements taken by the Gaia spacecraft the two stars have nearly identical parallax and proper motions confirming that they are a binary system.[2]
The primary star is a rapidly rotating subgiant star with a radius 2.65 times that of the Sun and a mass 1.64 times that of the Sun.[2][3]
The secondary star is a red dwarf[2] with a radius 0.68 times that of the Sun and a mass 0.58 times that of the Sun.[4]
Planetary system
There is one known planet orbiting HAT-P-67A. HAT-P-67b is a gas giant planet transiting its parent star every 4.8 days, at an orbital distance of 0.065 Astronomy:astronomical unit|astronomical units (9,700,000 km). It is one of the largest and lowest density planets known as of 2024[update].[3][5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.45±0.15 MJ | 0.06303 | 4.81010827(58) | 0 (assumed) | 85.01+0.35 −0.32[7]° |
2.140±0.025 RJ |
References
- ↑ Mugrauer, M (2019-12-21). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society 490 (4): 5088–5102. doi:10.1093/mnras/stz2673. Bibcode: 2019MNRAS.490.5088M.
- ↑ 2.0 2.1 2.2 2.3 Gully-Santiago, Michael et al. (2024-04-01). "A Large and Variable Leading Tail of Helium in a Hot Saturn Undergoing Runaway Inflation". The Astronomical Journal 167 (4). doi:10.3847/1538-3881/ad1ee8. Bibcode: 2024AJ....167..142G.
- ↑ 3.0 3.1 Zhou, G. et al. (2017-05-01). "HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography". The Astronomical Journal 153 (5). doi:10.3847/1538-3881/aa674a. Bibcode: 2017AJ....153..211Z.
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Sicilia, D. et al. (2024). "The GAPS Programme at TNG: LVI. Characterisation of the low-density gas giant HAT-P-67 b with GIARPS". Astronomy & Astrophysics 687. doi:10.1051/0004-6361/202349116. Bibcode: 2024A&A...687A.143S.
- ↑ Wang, Gavin et al. (2025-05-27). "A Revised Density Estimate for the Largest Known Exoplanet, HAT-P-67 b". The Astronomical Journal 169 (6). doi:10.3847/1538-3881/adcec9. ISSN 0004-6256. Bibcode: 2025AJ....169..336W.
- ↑ Saha, Suman (2024-09-01). "Precise Transit Photometry Using TESS. II. Revisiting 28 Additional Transiting Systems with Updated Physical Properties". The Astrophysical Journal Supplement Series 274 (1): 13. doi:10.3847/1538-4365/ad6a60. ISSN 0067-0049. Bibcode: 2024ApJS..274...13S.
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