HAT-P-65

HAT-P-65 is a faint star located in the equatorial constellation Equuleus. With an apparent magnitude of 13.16, it requires a telescope to be seen. The star is located 2,460 light-years (750 pc) away from Earth,[2] but is drifting close with a radial velocity of -48 km/s.

HAT-P-65
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus[1]
Right ascension 21h 03m 37.3131s[2]
Declination +11° 59 21.820[2]
Apparent magnitude (V) 13.16±0.02[3]
Characteristics
Spectral type G2IV[4]
B−V color index +0.65[3]
Astrometry
Radial velocity (Rv)−47.77±0.10[4] km/s
Proper motion (μ) RA: 4.175(24) mas/yr[2]
Dec.: −6.263(16) mas/yr[2]
Parallax (π)1.3261 ± 0.0353 mas[2]
Distance2,460 ± 70 ly
(750 ± 20 pc)
Details[4]
Mass1.21±0.05 M
Radius1.86±0.10 R
Luminosity2.71±0.14[5] L
Surface gravity (log g)4.03+0.08
−0.07
[6] cgs
Temperature5916+107
−138
[6] K
Metallicity [Fe/H]0.10±0.08 dex
Rotational velocity (v sin i)7.1±0.5 km/s
Age5.46±0.61 Gyr
Other designations
Gaia DR3 1757302881526250496, GSC 01111-00383, 2MASS J21033731+1159218[7]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

Properties

HAT-P-65 has a similar spectral type to that of the Sun. However, it is 21% more massive, and 86% larger than the latter. HAT-P-65 is slightly hotter, with an effective temperature of 5,916 K compared to 5,778 K of the Sun. It also has a higher luminosity and metallicity, with an iron content 26% greater than the Sun.

Planetary system

In 2016, an inflated hot Jupiter was discovered orbiting the star in a tight 2 day orbit. As of 2019, the planet has been suffering orbital decay due to its proximity.[8]

The HAT-P-65 planetary system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.53±0.09 MJ 0.04±0.00 2.61±0.00 <0.304 84.2±1.3° 1.89±0.13 RJ

References

  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  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. Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (1 February 2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal. 145 (2): 44. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. S2CID 119299381.
  4. Hartman, J. D.; et al. (1 December 2016). "HAT-P-65b and HAT-P-66b: Two Transiting Inflated Hot Jupiters and Observational Evidence for the Reinflation of Close-in Giant Planets". The Astronomical Journal. 152 (6) 182. arXiv:1609.02767. Bibcode:2016AJ....152..182H. doi:10.3847/0004-6256/152/6/182. S2CID 118546031.
  5. 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.
  6. Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; De Lee, Nathan; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara; Fleming, Scott W.; Rose, Mark E.; Tenenbaum, Peter; Ting, Eric B.; Kane, Stephen R.; Barclay, Thomas; Bean, Jacob L.; Brassuer, C. E.; Charbonneau, David; Ge, Jian; Lissauer, Jack J.; Mann, Andrew W.; McLean, Brian; Mullally, Susan; Narita, Norio; Plavchan, Peter; Ricker, George R.; Sasselov, Dimitar; Seager, S.; Sharma, Sanjib; Shiao, Bernie; Sozzetti, Alessandro; Stello, Dennis; Vanderspek, Roland; Wallace, Geoff; Winn, Joshua N. (1 October 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. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
  7. "HAT-P-65". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-02-22.
  8. Alvarado-Montes, Jaime A; García-Carmona, Carolina (2019-07-01). "Orbital decay of short-period gas giants under evolving tides". Monthly Notices of the Royal Astronomical Society. 486 (3): 3963–3974. arXiv:1904.07596. doi:10.1093/mnras/stz1081. ISSN 0035-8711.
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