The sub-Saturn Mass Transiting Planet HAT-P-12b

Abstract

We present new photometric data of the transiting planet HAT-P-12b observed in 2011. Our three transit curves are modelled using the JKTEBOP code and adopting the quadratic limb-darkening law. Including our measurements, 18 transit times spanning about 4.2 yr were used to determine the improved ephemeris with a transit epoch of 2,454,187.85560$\pm$0.00011 BJD and an orbital period of 3.21305961$\pm$0.00000035 d. The physical properties of the star-planet system are computed using empirical calibrations from eclipsing binary stars and stellar evolutionary models, combined with both our transit parameters and previously-known spectroscopic results. We found that the absolute dimensions of the host star are $M_{\mathrm{A}}$=0.73$\pm$0.02 M${}_{\odot }$, $R_{\mathrm{A}}$=0.70$\pm$0.01 R${}_{\odot }$, log $g_{\mathrm{A}}$=4.61$\pm$0.02, ${\rho }_{\mathrm{A}}$=2.10$\pm$0.09 ${\rho }_{\odot }$, and $L_{\mathrm{A}}$=0.21$\pm$0.01 L${}_{\odot }$. The planetary companion has $M_{\mathrm{b}}$=0.21$\pm$0.01 M${}_{\mathrm{Jup}}$, $R_{\mathrm{b}}$=0.94$\pm$0.01 R${}_{\mathrm{Jup}}$, log $g_{\mathrm{b}}$=2.77$\pm$0.02, ${\rho }_{\mathrm{b}}$=0.24$\pm$0.01 ${\rho }_{\mathrm{Jup}}$, and $T_{\mathrm{eq}}$=960$\pm$14 K. Our results agree well with standard models of irradiated gas giants with a core mass of 11.3 M${}_{\oplus }$.

17 pages, including 5 figures and 5 tables, accepted for publication in AJ

References in corpus (13)

• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• Kepler-16: A Transiting Circumbinary Planet
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• Homogeneous studies of transiting extrasolar planets. III. Additional planets and stellar models
• HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transiting a Metal-Poor K Dwarf
• Homogeneous studies of transiting extrasolar planets. II. Physical properties
• WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star
• HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars
• Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b
• WASP-21b: a hot-Saturn exoplanet transiting a thick disc star
• WASP-37b: a 1.8 MJ exoplanet transiting a metal-poor star
• A lower mass for the exoplanet WASP-21b
• Physical Properties of the Transiting Planetary System TrES-3

Cited by in corpus (24)

• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• A library of ATMO forward model transmission spectra for hot Jupiter exoplanets
• TESS Transit Timing of Hundreds of Hot Jupiters
• The GAPS Programme with HARPS-N at TNG XVI: Measurement of the Rossiter-McLaughlin effect of the transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39 and WASP-60
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• Deciphering the atmosphere of HAT-P-12b: solving discrepant results
• Warm Spitzer Photometry of Three Hot Jupiters: HAT-P-3b, HAT-P-4b and HAT-P-12b
• The DWARF project: Eclipsing binaries - precise clocks to discover exoplanets
• Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR
• ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
• Investigating the physical properties of transiting hot Jupiters with the 1.5-m Kuiper Telescope
• The Pulsating sdB+M Eclipsing System NY Virginis and its Circumbinary Planets
• The TROY project: II. Multi-technique constraints on exotrojans in nine planetary systems
• 1SWASP J093010.78+533859.5: A Possible Hierarchical Quintuple System
• Exoplanet Transits Registered at the Universidad de Monterrey Observatory. Part I: HAT-P-12b, HAT-P-13b, HAT-P-16b, HAT-P-23b and WASP-10b
• The Pre-He White Dwarfs in Eclipsing Binaries. I. WASP 0131+28
• The Physical Nature and Orbital Behavior of the Eclipsing System DK Cygni
• Physical Properties of the Low-Mass Eclipsing Binary NSVS 02502726
• Long-term CCD Photometry and Physical Properties of the sdB+M Eclipsing System 2M 1533+3759
• Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b
• Photometric defocus observations of transiting extrasolar planets
• Using limb darkening to measure fundamental parameters of stars
• The Kepler Eclipsing Binary V2281 Cygni with Twin Stars
• Transit Timing Variations of the Sub-Saturn Exoplanet HAT-P-12b