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HAT-P-18b (Her)

BASIC DATA FROM: Exoplanets Data Explorer

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 ...


Reference CCD frame with callibration stars

 


CCD OBSERVATIONS


Date: 2013-04-14

Submission to: ETD - Exoplanet Transit Database

Details

Optic(s): RC 12" with Astro-Physics corrector @ f/5
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik 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: Remote controlled IRIDA Observatory, BG, longitude: E 24 44' 19", latitude: N 41 41' 51"
Exposure Details:

Tri-G filter: 194 frames 60 sec each, Bin 1

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided
Processing:

Reduction
Differential Photometry

 

Differential Photometry and Light Curve with FOTODIFF

 

         
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