Exoplanet HAT-P-18b (Her)

Discovery and References:

HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars

(J. D. Hartman, G. Á. Bakos, B. Sato, G. Torres, R. W. Noyes, D. W. Latham, G. Kovács, D. A. Fischer, A. W. Howard, J. A. Johnson, G. W. Marcy, L. A. Buchhave, G. Füresz, G. Perumpilly, B. Béky, R. P. Stefanik, D. D. Sasselov, G. A. Esquerdo, M. Everett, Z. Csubry, J. Lázár, I. Papp, P. Sári)

... report the discovery of two new transiting extrasolar planets. HAT-P-18b orbits the V=12.759 K2 dwarf star GSC 2594-00646, with a period P=5.508023+-0.000006 d, transit epoch Tc=2454715.02174+-0.00020 (BJD), and transit duration 0.1131+-0.0009 d. The host star has a mass of 0.77+-0.03 Msun, radius of 0.75+-0.04 Rsun, effective temperature 4803+-80 K, and metallicity [Fe/H]=+0.10+-0.08. The planetary companion has a mass of 0.197+-0.013 Mjup, and radius of 0.995+-0.052 Rjup yielding a mean density of 0.25+-0.04 g cm-3 ...

BASIC DATA FROM: Exoplanets Data Explorer
Reference CCD frame with the callibration stars
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© Velimir Popov & Emil Ivanov 2013


Date: 2013-04-17

Submission to: ETD - Exoplanet Transit Database

Differential Photometry and Light Curve with FOTODIFF

Optic(s): RC 12" with Astro-Physics corrector @ f/5 (RC)
Mount: ASA DDM85 Premium
Camera: ATIK 4000 M
Filters: Astronomik Tri G filter - very symilar to V (Jonson)
Dates/Times: 2013-04-17 from UTC 21:25:46 to 2013-04-18 UTC 01:25:32
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: Tri G filter: 194 frames 60 sec each, Bin 1
More details: Dark and flat frames reduction
Processing: Reduction and Differential Photometry
Copyright: Velimir Popov and Emil Ivanov 2013. All Rights Reserved
e-mail: info@irida-observatory.org
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