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TOPIC: HAT-P-12b
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HAT-P-12b
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Title: The sub-Saturn Mass Transiting Planet HAT-P-12b
Authors: Jae Woo Lee, Jae-Hyuck Youn, Seung-Lee Kim, Chung-Uk Lee, Tobias Cornelius Hinse

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±0.00011 BJD and an orbital period of 3.21305961±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_A=0.73 ±0.02 solar masses, R_A=0.70 ±0.01 solar radii, log g_A=4.61 ±0.02, rho_A=2.10 ±0.09 rho_{\odot}, and L_A=0.21 ±0.01 L_\odot. The planetary companion has M_b=0.21 ±0.01 Jupitar masses, R_b=0.94 ±0.01 Jupitar radii, log g_{b}=2.77 ±0.02, rho_b=0.24 ±0.01 rho_{Jup}, and T_eq=960 ±14 K. Our results agree well with standard models of irradiated gas giants with a core mass of 11.3 M_{\oplus}.

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Blobrana


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HAT-P-12 b
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HAT-P-12 b is the 347th exoplanet discovered, and lies about 463 light years away.

NameHAT-P-12 b
Discovered in2009 
M.sin i0.211 (± 0.012) MJ
Semi major axis0.0384 (± 0.0003) AU
Orbital period3.2130598 (± 2.1e-06) days
Eccentricity0 
Radius0.959 (-0.021+0.029) RJ
Ttransit2454419.19556 (± 0.0002)
Update04/05/09 

Source


Title: HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transiting a Metal-Poor K Dwarf
Authors: J. D. Hartman, G. A. Bakos, G. Torres, G´eza Kovacs, R. W. Noyes, A. Pal, D. W. Latham, B. Sipocz, D. A. Fischer, J. A. Johnson, G. W. Marcy, R. P. Butler, A. W. Howard, G. A. Esquerdo, D. D. Sasselov, Gabor Kovacs, R. P. Stefanik, J. M. Fernandez, J. Lazar, I. Papp, P. Sari

We report on the discovery of HAT-P-12b, a transiting extrasolar planet orbiting the moderately bright V = 12.8 K4 dwarf GSC 03033-00706, with a period P = 3.2130598 ± 0.0000021 d, transit epoch Tc = 2454419.19556±0.00020 (BJD) and transit duration 0.0974±0.0006 d. The host star has a mass of 0.73 ± 0.02 solar masses, radius of 0.70+0.02 -0.01 solar radii, effective temperature 4650 ± 60K and metallicity [Fe/H] = -0.29 ± 0.05. The planetary companion has a mass of 0.211 ± 0.012MJ, and radius of 0.959+0.029 -0.021 RJ yielding a mean density of 0.295 ± 0.025 g cm^-3. Comparing these observations with recent theoretical models we find that HAT-P-12b is consistent with a ~ 1-4.5 Gyr, mildly irradiated, H/He dominated planet with a core mass M_C ~< 10 solar masses. HAT-P-12b is thus the least massive H/He dominated gas giant planet found to date. This record was previously held by Saturn

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RE: HAT-P-12b
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The sub-Saturn sized exoplanet, HAT-P-12 b, has an orbital period of 3.21 days.

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Posts: 131433
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Title: HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transiting a Metal-Poor K Dwarf
Authors: J. D. Hartman (1), G. Á. Bakos (1,2), G. Torres (1), Géza Kovács (3), R. W. Noyes (1), A. Pál (1,3,4), D. W. Latham (1), B. Sipöcz (1,4), D. A. Fischer (5), J. A. Johnson (6), G. W. Marcy (7), R. P. Butler (8), A. W. Howard (7), G. A. Esquerdo (1), D. D. Sasselov (1), Gábor Kovács (1), R. P. Stefanik (1), J. M. Fernandez (1,9), J. Lázár (10), I. Papp (10), P. Sári (10), ((1) CfA, (2) NSF Fellow, (3) Konkoly Observatory, (4) ELTE, (5) SFSU, (6) IfA, (7) UC Berkeley, (8) Carnegie Institute of Washington, (9) PUC, (10) Hungarian Astronomical Association)

We report on the discovery of HAT-P-12b, a transiting extrasolar planet orbiting the moderately bright V=12.8 K4 dwarf GSC 03033-00706, with a period P = 3.2130598 ± 0.0000021 d, transit epoch Tc = 2454419.19556 ± 0.00020 (BJD) and transit duration 0.0974 ± 0.0006 d. The host star has a mass of 0.73 ± 0.02 Msun, radius of 0.70 ± ^0.02_0.01 Rsun, effective temperature 4650 ± 60 K and metallicity [Fe/H] = -0.29 ± 0.05. The planetary companion has a mass of 0.211 ± 0.012 MJup, and a radius of 0.959 ± ^0.029_0.021 RJup yielding a mean density of 0.295 ± 0.025 g cm^-3. Comparing these observations with recent theoretical models we find that HAT-P-12b is consistent with a ~ 1-4.5 Gyr, mildly irradiated, H/He dominated planet with a core mass Mc <~ 10 Mearth. HAT-P-12b is thus the least massive H/He dominated gas giant planet found to date. This record was previously held by Saturn.

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