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Post Info TOPIC: HAT-P-20b--HAT-P-23b
Blobrana


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Posts: 131433
Date:
HAT-P-23b
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Title: Parameters of Recent Transits of HAT-P-23b
Authors: Felipe G. Ramón-Fox, Pedro V. Sada

Four transits of the exoplanet HAT-P-23b were recently observed with the 0.36m telescope at the Universidad de Monterrey Observatory. The four light curves were successfully combined to obtain a resulting one with reduced scattering per bin. This one was modelled using a Monte Carlo method to obtain the essential parameters that characterise the system. Assuming orbital parameters such as eccentricity, e, and longitude of periastron, w, from the discovery paper, we found values of Rp/R* = 0.1105 +0.0015-0.0013 for the planet-to-star radius ratio, a/R* = 4.23 +0.06-0.12 for the scaled semimajor axis, and an orbital inclination of the system of i = 87.9d +1.5-2.2. We also derive an improved orbital period of 1.2128868 ± 0.0000004 days (To = 2,454,852.26542 ± 0.00018 BJD_TDB) for the system.

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Blobrana


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Posts: 131433
Date:
HAT-P-20b--HAT-P-23b
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Title: HAT-P-20b--HAT-P-23b: Four Massive Transiting Extrasolar Planets
Authors: G. Á. Bakos (1,2), J. Hartman (1), G. Torres (1), D. W. Latham (1), Géza Kovács (3), R. W. Noyes (1), D. A. Fischer (4,5), J. A. Johnson (6), G. W. Marcy (7), A. W. Howard (7), D. Kipping (1,8), G. A. Esquerdo (1), A. Shporer (9), B. Béky (1), L. A. Buchhave (10) G. Perumpilly (1), M. Everett (1), D. D. Sasselov (1), R. P. Stefanik (1), J. Lázár (11), I. Papp (11), P. Sári (11) ((1) Harvard-Smithsonian CfA, Cambridge, MA, USA, (2) NSF Fellow, (3) Konkoly Observatory, Budapest, Hungary, (4) Astronomy Department, Yale University, New Haven, CT, (5) Department of Physics and Astronomy, San Francisco State University, San Francisco, CA, (6) California Institute of Technology, Department of Astrophysics, Pasadena, CA, (7) Department of Astronomy, UC Berkeley, Berkeley, CA, (8) UCL, Dept. of Physics, London, UK, (9) LCOGT, Santa Barbara, CA, (10) Niels Bohr Institute, Copenhagen University, Denmark (11) Hungarian Astronomical Association, Budapest)

We report the discovery of four relatively massive (2-7MJ) transiting extrasolar planets. HAT-P-20b orbits a V=11.339 K3 dwarf star with a period P=2.875317±0.000004d. The host star has a mass of 0.760±0.03 Msun, radius of 0.690±0.02 Rsun, Teff=4595±80 K, and metallicity [Fe/H]=+0.35±0.08. HAT-P-20b has a mass of 7.246±0.187 MJ, and radius of 0.867±0.033 RJ yielding a mean density of 13.78±1.50 gcm^-3 , which is the second highest value among all known exoplanets. HAT-P-21b orbits a V=11.685 G3 dwarf on an eccentric (e=0.2280±0.016) orbit, with a period of P=4.1244810±000007d. The host star has a mass of 0.95±0.04Msun, radius of 1.10±0.08Rsun, Teff=5588±80K, and [Fe/H]=+0.01±0.08. HAT-P-21b has a mass of 4.063±0.161MJ, and radius of 1.024±0.092RJ. HAT-P-22b orbits the V=9.732 G5 dwarf HD233731, with P=3.2122200±0.000009d. The host star has a mass of 0.92±0.03Msun, radius of 1.04±0.04Rsun, Teff=5302±80K, and metallicity of +0.24±0.08. The planet has a mass of 2.147±0.061 MJ, and compact radius of 1.080±0.058RJ. The host star also harbours an M-dwarf companion at a wide separation. Finally, HAT-P-23b orbits a V=12.432 G0 dwarf star, with a period P=1.212884±0.000002d. The host star has a mass of 1.13±0.04sun, radius of 1.20±0.07Rsun, Teff=5905±80K, and [Fe/H]=+0.15±0.04. The planetary companion has a mass of 2.090±0.111MJ, and radius of 1.368±0.090RJ.

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