astro.wikisort.org - Planet
HAT-P-26 is a K-type main-sequence star about 302 light-years away. Survey in 2015 did not find any stellar companions on orbit around it,[4] although a red dwarf companion with a temperature 4000+100
−350 K is suspected on wide orbit.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 12m 37.5330s[1] |
| Declination | +04° 03′ 36.1177″[1] |
| Apparent magnitude (V) | 11.76[1] |
| Characteristics | |
| Spectral type | K1V |
| Astrometry | |
| Parallax (π) | 10.7960 ± 0.0561 mas[1] |
| Distance | 302 ± 2 ly (92.6 ± 0.5 pc) |
| Details[2] | |
| Mass | 0.81 M☉ |
| Radius | 0.78 R☉ |
| Temperature | 5079±88 K |
| Metallicity | -0.04±0.08[3] |
| Rotational velocity (v sin i) | 1.8 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
In 2010 a transiting hot Neptune like planet was detected.[3] The transiting planet HAT-P-26b was detected by the HATNet Project using telescopes located in Hawaii and Arizona. The planet is likely formed by pebble accretion mechanism.[6]
The transmission spectrum of the HAT-P-26b was taken in the 2015, with best fit favouring either cloudless atmosphere or atmosphere with low-lying cloud deck.[7] The atmospheric composition of the planet was measured in 2019, and the water vapor volume fraction of 1.5+2.1
−0.9% was detected. The HAT-P-26 is carbon depleted, C/O ratio been constrained to less than 0.33. Also, atmosphere contains light metal hydrides.[8] The measured planetary temperature is equal to 563+58
−54 K.
In 2019, the transit timing variation analysis of HAT-P-26b, has indicated a presence of the second planet in the system on the wide, 1141-days orbit.[9]
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.0585±0.00717 MJ | 0.0479±0.0006 | 4.234516±0.000015 | 0.124±0.060 | 88.6±0.9° | 0.5647±0.0517 RJ |
| c (unconfirmed) | — | — | 1141 | — | — | — |
References
- HAT-P-26 -- High proper-motion Star
- D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", A&A 529, A136 (2011)
- Hartman, J. D.; Bakos, G. Á.; Kipping, D. M.; Torres, G.; Kovács, G.; Noyes, R. W.; Latham, D. W.; Howard, A. W.; Fischer, D. A.; Johnson, J. A.; Marcy, G. W.; Isaacson, H.; Quinn, S. N.; Buchhave, L. A.; Béky, B.; Sasselov, D. D.; Stefanik, R. P.; Esquerdo, G. A.; Everett, M.; Perumpilly, G.; Lázár, J.; Papp, I.; Sári, P. (2010), "HAT-P-26b: A LOW-DENSITY NEPTUNE-MASS PLANET TRANSITING A K STAR", The Astrophysical Journal, 728 (2): 138, arXiv:1010.1008, doi:10.1088/0004-637X/728/2/138, S2CID 119228956
- Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, doi:10.1051/0004-6361/201424091, S2CID 119250579
- Piskorz, Danielle; Knutson, Heather A.; Ngo, Henry; Muirhead, Philip S.; Batygin, Konstantin; Crepp, Justin R.; Hinkley, Sasha; Morton, Timothy D. (2015), "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal, 814 (2): 148, arXiv:1510.08062, doi:10.1088/0004-637X/814/2/148, S2CID 11525988
- Mohamad Ali-Dib, Gunjan Lakhlani, "Possible formation pathways for the low-density Neptune-mass planet HAT-P-26b"
- Stevenson, Kevin B.; Bean, Jacob L.; Seifahrt, Andreas; Gilbert, Gregory J.; Line, Michael R.; Désert, Jean-Michel; Fortney, Jonathan J. (2015), "A SEARCH FOR WATER IN THE ATMOSPHERE OF HAT-P-26b USING LDSS-3C", The Astrophysical Journal, 817 (2): 141, arXiv:1511.08226, doi:10.3847/0004-637X/817/2/141, S2CID 118394486
- MacDonald, Ryan J.; Madhusudhan, Nikku (2019), "The Metal-Rich Atmosphere of the Neptune HAT-P-26b", Monthly Notices of the Royal Astronomical Society, 486: 1292–1315, arXiv:1903.09151, doi:10.1093/mnras/stz789, S2CID 85459516
- von Essen, C.; Wedemeyer, S.; Sosa, M. S.; Hjorth, M.; Parkash, V.; Freudenthal, J.; Mallonn, M.; Miculán, R. G.; Zibecchi, L.; Cellone, S.; Torres, A. F. (2019), "Indications for transit timing variations in the exo-Neptune HAT-P-26b", Astronomy & Astrophysics, 628: A116, arXiv:1904.06360, doi:10.1051/0004-6361/201731966, S2CID 118674293
- "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
- Planet HAT-P-26 b on exoplanet.eu
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |
 | This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it. |
На других языках
- [en] HAT-P-26
[ru] HAT-P-26
HAT-P-26 — звезда, которая находится в созвездии Девы на расстоянии около 437 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
WikiSort.org - проект по пересортировке и дополнению контента Википедии