HAT-P-67

Last updated
HAT-P-67
Observation data
Epoch J2000       Equinox J2000
Constellation Hercules [1]
HAT-P-67A
Right ascension 17h 06m 26.5608s [2]
Declination +44° 46′ 37.068″ [2]
Apparent magnitude  (V)10.069(16) [3]
HAT-P-67B
Right ascension 17h 06m 26.2261s [4]
Declination +44° 46′ 45.446″ [4]
Characteristics
Spectral type F5IV [5]
Apparent magnitude  (J)9.145(21) [6]
Apparent magnitude  (H)8.961(19) [6]
Apparent magnitude  (K)8.900(19) [6]
Variable type Planetary transit [7]
Astrometry
HAT-P-67A
Radial velocity (Rv)−2.234(27) [8] km/s
Proper motion (μ)RA: 9.541(11) mas/yr [2]
Dec.: −18.251(13) mas/yr [2]
Parallax (π)2.6869±0.0101  mas [2]
Distance 1,214 ± 5  ly
(372 ± 1  pc)
Absolute magnitude  (MV)2.50+0.13
−0.23 [7]
HAT-P-67B
Proper motion (μ)RA: 9.977(56) mas/yr [4]
Dec.: −18.370(58) mas/yr [4]
Parallax (π)2.5831 ± 0.0485  mas [4]
Distance 1,260 ± 20  ly
(387 ± 7  pc)
Details
A
Mass 1.73±0.10 [9]   M☉
Radius 2.65±0.12 [5]   R☉
Luminosity 11.96+0.84
−0.73 [9]   L☉
Surface gravity (log g)3.84±0.03 [9]   cgs
Temperature 6640+140
−130 [9]   K
Metallicity [Fe/H]0.14+0.14
−0.12 [9]   dex
Rotation 5.40±0.09 [9] days
Rotational velocity (v sin i)35.8±1.1 [5]  km/s
Age 1.46+0.29
−0.26 [9]   Gyr
B
Mass 0.576 [4]   M☉
Radius 0.678 [4]   R☉
Luminosity0.065 [4]   L☉
Surface gravity (log g)4.48 [4]   cgs
Temperature 3600 [4]   K
Position (relative to HAT-P-67A) [10]
ComponentHAT-P-67B
Angular distance 9.09945(6) ″
Position angle 336.98893(40)°
Projected separation 3400 AU [5]
Other designations
BD+44 2654, Gaia DR3 1358614983131339392, TOI-2014, TYC 3084-533-1, GSC 03084-00533, 2MASS J17062656+4446371 [11]
HAT-P-67B: Gaia DR3 1358614983131339392 [5]
Database references
SIMBAD data

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.

Contents

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. [10] 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. [5]

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. [5] [7]

The secondary star is a red dwarf [5] 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 astronomical units (9,700,000 km). It is one of the largest and lowest density planets known as of 2024. [7] [8]

Transit light curve of HAT-P-67b Transit light curve of Hat-P-67b.png
Transit light curve of HAT-P-67b
The HAT-P-67 planetary system [9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.45±0.15  MJ 0.063034.81010827(58)0 (assumed)85.01+0.35
−0.32 [12] ° 		2.140±0.025  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 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. ↑ Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H. Vizier catalog entry
  4. 1 2 3 4 5 6 7 8 9 10 11 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.
  5. 1 2 3 4 5 6 7 8 9 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) 142. arXiv: 2307.08959 . Bibcode: 2024AJ....167..142G . doi: 10.3847/1538-3881/ad1ee8 .
  6. 1 2 3 Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode: 2006AJ....131.1163S . doi: 10.1086/498708 . Vizier catalog entry
  7. 1 2 3 4 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) 211. arXiv: 1702.00106 . Bibcode: 2017AJ....153..211Z . doi: 10.3847/1538-3881/aa674a .
  8. 1 2 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 A143. arXiv: 2404.03317 . Bibcode: 2024A&A...687A.143S . doi: 10.1051/0004-6361/202349116 .
  9. 1 2 3 4 5 6 7 8 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) 336. arXiv: 2504.13997 . Bibcode: 2025AJ....169..336W . doi: 10.3847/1538-3881/adcec9 . ISSN   0004-6256.
  10. 1 2 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. Bibcode: 2019MNRAS.490.5088M . doi: 10.1093/mnras/stz2673 .
  11. ↑ "HAT-P-67". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2024-04-09.
  12. ↑ 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. arXiv: 2407.20846 . Bibcode:2024ApJS..274...13S. doi: 10.3847/1538-4365/ad6a60 . ISSN   0067-0049.
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