J/ApJ/706/785 HAT-P-12 light curve (Hartman+, 2009)
HAT-P-12b: a low-density sub-Saturn mass planet transiting a metal-poor K dwarf.
Hartman J.D., Bakos G.A., Torres G., Kovacs G., Noyes R.W., Pal A.,
Latham D.W., Sipocz B., Fischer D.A., Johnson J.A., Marcy G.W.,
Butler R.P., Howard A.W., Esquerdo G.A., Sasselov D.D., Kovacs G.,
Stefanik R.P., Fernandez J.M., Lazar J., Papp I., Sari P.
<Astrophys. J., 706, 785-796 (2009)>
=2009ApJ...706..785H 2009ApJ...706..785H
ADC_Keywords: Photometry, ugriz ; Stars, double and multiple ; Planets
Keywords: planetary systems - stars: individual (HAT-P-12, GSC 03033-00706) -
techniques: photometric - techniques: spectroscopic
Abstract:
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±0.0000021d, transit epoch
Tc=2454419.19556±0.00020 (BJD), and transit duration
0.0974±0.0006d. The host star has a mass of 0.73±0.02M☉,
radius of 0.70+0.02-0.01R☉, effective temperature
4650±60K, and metallicity [Fe/H]=-0.29±0.05. We find a slight
correlation between the observed spectral line bisector spans and the
radial velocity, so we consider, and rule out, various blend
configurations including a blend with a background eclipsing binary,
and hierarchical triple systems where the eclipsing body is a star or
a planet. We conclude that a model consisting of a single star with a
transiting planet best fits the observations, and show that a likely
explanation for the apparent correlation is contamination from
scattered moonlight. Based on this model, the planetary companion has
a mass of 0.211±0.012MJ and radius of 0.959+0.029-0.021RJ
yielding a mean density of 0.295±0.025g/cm3. Comparing these
observations with recent theoretical models, we find that HAT-P-12b is
consistent with a ∼1-4.5Gyr, mildly irradiated, H/He-dominated planet
with a core mass MC≲10M{earth}.
Description:
The transits of HAT-P-12b were detected with the HAT-5 telescope in
Arizona. The region around GSC 03033-00706, a field internally
labeled as 145, was observed on a nightly basis between 2006 January
and July, whenever weather conditions permitted.
Objects:
-------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------
13 57 33.5 +43 29 37 HAT-P-12 = GSC 03033-00706
-------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 41 959 Photometry follow-up of HAT-P-12
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d BJD Bary-centric Julian Date
15- 22 F8.5 mag mag Differential magnitude in Filt (1)
24- 30 F7.5 mag e_mag The 1σ error in mag
32- 39 F8.5 mag Omag Original, raw magnitude (2)
41 A1 --- Filt Filter used in the observation (g, i or z)
--------------------------------------------------------------------------------
Note (1): The out-of-transit level has been subtracted. These magnitudes
have been subjected to External Parameter Decorrelation technique in
"constant" mode (EPD; see Bakos et al. 2010ApJ...710.1724B 2010ApJ...710.1724B) and Trend
Filtering Algorithm (TFA; see Kovacs et al. 2005MNRAS.356..557K 2005MNRAS.356..557K)
procedure, carried out simultaneously with the transit fit.
Note (2): Without application of the EPD and TFA procedures.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Dec-2011