HAT-P-20b--HAT-P-23b: Four Massive Transiting Extrasolar Planets

G. \'A. Bakos (1,2); J. Hartman (1); G. Torres (1); D. W. Latham (1),; G\'eza Kov\'acs (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. B\'eky (1); L. A. Buchhave (10) G. Perumpilly (1); M. Everett; (1); D. D. Sasselov (1); R. P. Stefanik (1); J. L\'az\'ar (11); I. Papp (11),; P. S\'ari (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; 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)

arXiv:1008.3388·astro-ph.EP·May 19, 2015

HAT-P-20b--HAT-P-23b: Four Massive Transiting Extrasolar Planets

G. \'A. Bakos (1,2), J. Hartman (1), G. Torres (1), D. W. Latham (1),, G\'eza Kov\'acs (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. B\'eky (1)

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TL;DR

This paper reports the discovery and characterization of four massive transiting exoplanets, providing detailed measurements of their masses, radii, and host star properties, and highlighting the diversity of such systems.

Contribution

The study presents four newly discovered massive transiting exoplanets with detailed stellar and planetary parameters, expanding the known diversity of exoplanet characteristics.

Findings

01

HAT-P-20b has the second highest density among known exoplanets.

02

HAT-P-21b has an eccentric orbit with e=0.228.

03

HAT-P-22b and HAT-P-23b have well-measured masses and radii, with HAT-P-22b hosting a wide-separation M-dwarf companion.

Abstract

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…

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