J/ApJ/742/59 HAT-P-32 and HAT-P-33 follow-up (Hartman+, 2011)
HAT-P-32b and HAT-P-33b: two highly inflated hot jupiters transiting
high-jitter stars.
Hartman J.D., Bakos G.A., Torres G., Latham D.W., Kovacs G., Beky B.,
Quinn S.N., Mazeh T., Shporer A., Marcy G.W., Howard A.W., Fischer D.A.,
Johnson J.A., Esquerdo G.A., Noyes R.W., Sasselov D.D., Stefanik R.P.,
Fernandez J.M., Szklenar T., Lazar J., Papp I., Sari P.
<Astrophys. J., 742, 59 (2011)>
=2011ApJ...742...59H 2011ApJ...742...59H
ADC_Keywords: Photometry, ugriz ; Planets ; Radial velocities ;
Stars, double and multiple
Keywords: planetary systems - stars: individual (HAT-P-32, GSC 3281-00800,
HAT-P-33, GSC 2461-00988) - techniques: photometric -
techniques: spectroscopic
Abstract:
We report the discovery of two exoplanets transiting high-jitter
stars. HAT-P-32b orbits the bright V=11.289 late-F-early-G dwarf star
GSC 3281-00800, with a period P=2.150008±0.000001d. The stellar and
planetary masses and radii depend on the eccentricity of the system,
which is poorly constrained due to the high-velocity jitter (∼80m/s).
Assuming a circular orbit, the star has a mass of 1.16±0.04M☉
and radius of 1.22±0.02R☉, while the planet has a mass of
0.860±0.164MJ and a radius of 1.789±0.025RJ. The second
planet, HAT-P-33b, orbits the bright V=11.188 late-F dwarf star
GSC 2461-00988, with a period P=3.474474±0.000001d. As for HAT-P-32,
the stellar and planetary masses and radii of HAT-P-33 depend on the
eccentricity, which is poorly constrained due to the high jitter
(∼50m/s). In this case, spectral line bisector spans (BSs) are
significantly anti-correlated with the radial velocity residuals, and
we are able to use this correlation to reduce the residual rms to
∼35m/s. We find that the star has a mass of 1.38±0.04M☉ and a
radius of 1.64±0.03R☉ while the planet has a mass of
0.762±0.101MJ and a radius of 1.686±0.045RJ for an assumed
circular orbit. Due to the large BS variations exhibited by both stars
we rely on detailed modeling of the photometric light curves to rule
out blend scenarios. Both planets are among the largest radii
transiting planets discovered to date.
Description:
We obtained high-resolution, high S/N spectra for both stars using the
High Resolution Echelle Spectrometer (HIRES) on the Keck-I telescope
in Hawaii. For HAT-P-32, we gathered 28 spectra with the I2
absorption cell between 2007 August and 2010 December, together with a
single I2-free template spectrum. For HAT-P-33, we gathered 22
spectra with the I2 cell between 2008 September and 2010 December,
and two template spectra.
We conducted high-precision photometric observations of HAT-P-32 (2007
Sep 24 to 2007 Dec 4) and HAT-P-33 (2006 Dec 29 to 2011 Feb 11) using
the KeplerCam CCD camera on the FLWO 1.2m telescope, in giz bands.
Objects:
--------------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
--------------------------------------------------------------------
02 04 10.28 +46 41 16.2 HAT-P-32 = TYC 3281-800-1 (P=2.150008)
07 32 44.22 +33 50 06.1 HAT-P-33 = TYC 2461-988-1 (P=3.474474)
--------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 51 29 Relative radial velocities, bisector spans, and
activity index measurements of HAT-P-32
table4.dat 51 24 Relative radial velocities, bisector spans, and
activity index measurements of HAT-P-33
table5.dat 39 4601 High-precision differential photometry of HAT-P-32
table6.dat 39 2527 High-precision differential photometry of HAT-P-33
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
VI/135 : All-sky spectrally matched Tycho2 stars (Pickles+, 2010)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+A/552/A119 : Planet-star and moon-planet interaction (Saur+, 2013)
J/MNRAS/422/2024 : X-ray-age relation & exoplanet evaporation (Jackson+, 2012)
J/PASP/123/412 : Exoplanet Orbit Database (Wright+, 2011)
J/ApJ/734/109 : Follow-up photometry of HAT-P-27 (Beky+, 2011)
J/ApJ/728/138 : Follow-up photometry of HAT-P-26 (Hartman+, 2011)
J/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/ApJ/724/866 : Follow-up observations of HAT-P-15 (Kovacs+, 2010)
J/ApJ/715/458 : Differential photometry of HAT-P-14 (Torres+, 2010)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
J/ApJ/707/446 : HAT-P-13 photometry follow-up (Bakos+, 2009)
J/ApJ/706/785 : HAT-P-12 light curve (Hartman+, 2009)
J/ApJ/696/1950 : Sloan iz light curves of HAT-P-10 (Bakos+, 2009)
Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.5 d BJD [336.956/1545.94] Barycentric Julian Date (UTC;
BJD-2454000)
11 A1 --- f_BJD [e] e: observation during transit which was
excluded from the analysis
13- 19 F7.2 m/s RV [-211.65/312.16]? Relative radial velocity (1)
21- 25 F5.2 m/s e_RV [6.47/19.26]? RV uncertainty (2)
27- 33 F7.2 m/s BS [-127.71/155.85] Bisector span
35- 39 F5.2 m/s e_BS [2.83/24.14] BS uncertainty
41- 45 F5.3 --- S [0.165/0.241] Activity index measurement (3)
47- 51 F5.3 --- Phase Phase
--------------------------------------------------------------------------------
Note (1): The zero point of these velocities is arbitrary. An overall offset
γrel fitted to these velocities in Section 3.4 has not been
subtracted.
Note (2): Internal errors excluding the component of astrophysical jitter
considered in Section 3.4.
Note (3): Chromospheric activity index calibrated to the scale of Vaughan
et al. (1978PASP...90..267V 1978PASP...90..267V) following Isaacson & Fischer (2010,
Cat. J/ApJ/725/875).
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Byte-by-byte Description of file: table[56].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d BJD [54099.6/55614.9] Barycentric Julian Date
(BJD-2400000)
13- 20 F8.5 mag mag [-0.009/0.036] Processed magnitude in Filt (1)
22- 28 F7.5 mag e_mag [0.0008/0.0023] The 1σ error in mag
30- 37 F8.5 mag Omag [9.5/11.1] Original magnitude in Filt (2)
39 A1 --- Filt [giz] Filter used in the observation (g, i, z)
--------------------------------------------------------------------------------
Note (1): The out-of-transit level has been subtracted. These magnitudes
have been subjected to the EPD (External Parameter Decorrelation) and
TFA (Trend Filtering Algorithm) procedures, carried out simultaneously
with the transit fit.
Note (2): Raw magnitude values without application of the EPD and TFA
procedures.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 22-Apr-2013