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.
| 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] |
| Distance | 2,460 ± 70 ly (750 ± 20 pc) |
| Details[4] | |
| Mass | 1.21±0.05 M☉ |
| Radius | 1.86±0.10 R☉ |
| Luminosity | 2.71±0.14[5] L☉ |
| Surface gravity (log g) | 4.03+0.08 −0.07[6] cgs |
| Temperature | 5916+107 −138[6] K |
| Metallicity [Fe/H] | 0.10±0.08 dex |
| Rotational velocity (v sin i) | 7.1±0.5 km/s |
| Age | 5.46±0.61 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Properties
editHAT-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
editIn 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]
| 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
edit- ^ 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
- ^ a b c d e 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 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.
- ^ a b c d 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.
- ^ 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.
- ^ a b 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.
- ^ "HAT-P-65". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-02-22.
- ^ 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.