Qatar 1

Qatar 1 is a orange main sequence star in the constellation of Draco.

Qatar 1
Observation data
Epoch J2000      Equinox
Constellation Draco
Right ascension  20h 13m 31.6176s
Declination 65° 09′ 43.4909″
Apparent magnitude (V) 12.84
Characteristics
Evolutionary stage main sequence star
Spectral type K3V
B−V color index 1.06
V−R color index 0.19
J−H color index 0.472
J−K color index 0.590
Astrometry
Radial velocity (Rv)-37.835±0.063 km/s
Proper motion (μ) RA: 12.636±0.048 mas/yr
Dec.: 58.170±0.041 mas/yr
Parallax (π)5.3587 ± 0.0231 mas
Distance609 ± 3 ly
(186.6 ± 0.8 pc)
Details[1][2]
Mass0.85±0.03 M☉
Radius0.823±0.025 R☉
Surface gravity (log g)4.536±0.024 cgs
Temperature4861±125 K
Metallicity [Fe/H]0.2±0.1 dex
Rotational velocity (v sin i)1.7±0.3 km/s
Age4.5 Gyr
Other designations
Qatar-1, 2MASS J20133160+6509433, Gaia DR2 2244830490514284928[3]
Database references
SIMBAD1 data

Star characteristics

Qatar 1 has an average to high metallicity of 160% of solar,[1], and is of similar age to Sun.[2] The star has significant starspot activity.[4]

Planetary system

The "Hot Jupiter" class planet Qatar-1 b was discovered around Qatar 1 in 2010.[1] The planetary orbit is likely aligned with the rotational axis of the star, with the misalignment measurement based on the Rossiter-McLaughlin effect equal to −8.4±7.1 degrees.[2]. The planet's measured temperature is 1532±219 K.[5] Spectroscopic study in 2017 do suggest Qatar-1 b has relatively clear skies with a few clouds.[6]

Additional planets or brown dwarf in system were suspected in 2013,[7] but were refuted in 2015.[8][9]

The transit-timing variation search in 2020 has also resulted in no detection of additional planets in the system.[10]

The Qatar 1 planetary system[1][2][10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.33±0.05 MJ 0.02343±0.0012 1.42002368±0.00000015 0.020+0.011
−0.01		 84.23±0.06° 1.19±0.09 RJ
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References
  1. Alsubai, K. A.; Parley, N. R.; Bramich, D. M.; West, R. G.; Sorensen, P. M.; Collier Cameron, A.; Latham, D. W.; Horne, K.; Anderson, D. R.; Bakos, G. Á.; Brown, D. J. A.; Buchhave, L. A.; Esquerdo, G. A.; Everett, M. E.; Fűrész, G.; Hartman, J. D.; Hellier, C.; Miller, G. M.; Pollacco, D.; Quinn, S. N.; Smith, J. C.; Stefanik, R. P.; Szentgyorgyi, A. (2011). "Qatar-1b: A hot Jupiter orbiting a metal-rich K dwarf star". Monthly Notices of the Royal Astronomical Society. 417 (1): 709–716. arXiv:1012.3027. Bibcode:2011MNRAS.417..709A. doi:10.1111/j.1365-2966.2011.19316.x.
  2. Covino, E.; Esposito, M.; Barbieri, M.; Mancini, L.; Nascimbeni, V.; Claudi, R.; Desidera, S.; Gratton, R.; Lanza, A. F.; Sozzetti, A.; Biazzo, K.; Affer, L.; Gandolfi, D.; Munari, U.; Pagano, I.; Bonomo, A. S.; Collier Cameron, A.; Hébrard, G.; Maggio, A.; Messina, S.; Micela, G.; Molinari, E.; Pepe, F.; Piotto, G.; Ribas, I.; Santos, N. C.; Southworth, J.; Shkolnik, E.; Triaud, A. H. M. J.; et al. (2013). "The GAPS programme with HARPS-N at TNG". Astronomy & Astrophysics. 554: A28. arXiv:1304.0005. doi:10.1051/0004-6361/201321298.
  3. Qatar 1 -- High proper-motion Star
  4. Mislis, D.; Mancini, L.; Tregloan-Reed, J.; Ciceri, S.; Southworth, J.; d'Ago, G.; Bruni, I.; Baştürk, Ö.; Alsubai, K. A.; Bachelet, E.; Bramich, D. M.; Henning, Th.; Hinse, T. C.; Iannella, A. L.; Parley, N.; Schroeder, T. (2015). "High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b". Monthly Notices of the Royal Astronomical Society. 448 (3): 2617–2623. arXiv:1503.02246. Bibcode:2015MNRAS.448.2617M. doi:10.1093/mnras/stv197.
  5. Garhart, Emily; Deming, Drake; Mandell, Avi; Knutson, Heather A.; Wallack, Nicole; Burrows, Adam; Fortney, Jonathan J.; Hood, Callie; Seay, Christopher; Sing, David K.; Benneke, Björn; Fraine, Jonathan D.; Kataria, Tiffany; Lewis, Nikole; Madhusudhan, Nikku; McCullough, Peter; Stevenson, Kevin B.; Wakeford, Hannah (2020). "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses". The Astronomical Journal. 159 (4): 137. arXiv:1901.07040. Bibcode:2020AJ....159..137G. doi:10.3847/1538-3881/ab6cff.
  6. von Essen, C.; Cellone, S.; Mallonn, M.; Albrecht, S.; Miculán, R.; Müller, H. M. (2017). "Testing connections between exo-atmospheres and their host stars". Astronomy & Astrophysics. 603: A20. arXiv:1703.10647. doi:10.1051/0004-6361/201730506.
  7. von Essen, C.; Schröter, S.; Agol, E.; Schmitt, J. H. M. M. (2013). "Qatar-1: Indications for possible transit timing variations". Astronomy & Astrophysics. 555: A92. arXiv:1309.1457. Bibcode:2013A&A...555A..92V. doi:10.1051/0004-6361/201321407.
  8. MacIejewski, G.; Fernández, M.; Aceituno, F. J.; Ohlert, J.; Puchalski, D.; Dimitrov, D.; Seeliger, M.; Kitze, M.; Raetz, St.; Errmann, R.; Gilbert, H.; Pannicke, A.; Schmidt, J.-G.; Neuhäuser, R. (2015). "No variations in transit times for Qatar-1 B". Astronomy & Astrophysics. 577: A109. arXiv:1503.07191. Bibcode:2015A&A...577A.109M. doi:10.1051/0004-6361/201526031.
  9. Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G. (2015). "Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence for Additional Planets". arXiv:1512.00464 [astro-ph.EP].
  10. Investigating Extra-solar Planetary System Qatar-1 through Transit Observations, 2020, arXiv:2007.03753


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