Transit Timing Analysis In The HAT-P-32 System

We present the results of 45 transit observations obtained for the transiting exoplanet HATP-32b. The transits have been observed using several telescopes mainly throughout the YETI (Young Exoplanet Transit Initiative) network. In 25 cases, complete transit light curves with a timing precision better than 1.4 min have been obtained. These light curves have been used to refine the system properties, namely inclination i, planet-to-star radius ratio R-p/R-s, and the ratio between the semimajor axis and the stellar radius a/R-s. First analyses by Hartman et al. suggests the existence of a second planet in the system, thus we tried to find an additional body using the transit timing variation (TTV) technique. Taking also the literature data points into account, we can explain all mid-transit times by refining the linear ephemeris by 21 ms. Thus, we can exclude TTV amplitudes of more than similar to 1.5min.

[1]  S. Aigrain,et al.  The optical transmission spectrum of the hot Jupiter HAT-P-32b: clouds explain the absence of broad spectral features? , 2013, 1309.6998.

[2]  P. Rojo,et al.  TRANSIT MONITORING IN THE SOUTH (TraMoS) PROJECT: DISCARDING TRANSIT TIMING VARIATIONS IN WASP-5b , 2012, 1201.3616.

[3]  C. Broeg,et al.  A new algorithm for differential photometry: computing anoptimum artificial comparison star , 2005 .

[4]  Ralph Neuhäuser,et al.  Transit timing variation and activity in the WASP-10 planetary system , 2010 .

[5]  A. Pickles,et al.  All-Sky Spectrally Matched UBVRI - ZY and u′ g′ r′ i′ z′ Magnitudes for Stars in the Tycho2 Catalog , 2010, 1011.2020.

[6]  David M. Kipping.  Transit timing effects due to an exomoon , 2009 .

[7]  Alessandro Morbidelli,et al.  Mass and Orbit Determination from Transit Timing Variations of Exoplanets , 2008 .

[8]  Eric Agol,et al.  Transit Analysis Package: An IDL Graphical User Interface for Exoplanet Transit Photometry , 2011, 1102.1036.

[9]  B. Scott Gaudi,et al.  Achieving Better Than 1 Minute Accuracy in the Heliocentric and Barycentric Julian Dates , 2010, 1005.4415.

[10]  J. W. Lee,et al.  Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin , 2013, 1301.5976.

[11]  Avi Shporer,et al.  LONG-TERM TRANSIT TIMING MONITORING AND REFINED LIGHT CURVE PARAMETERS OF HAT-P-13b , 2011, 1105.5599.

[12]  D. W. Latham,et al.  HAT-P-32b AND HAT-P-33b: TWO HIGHLY INFLATED HOT JUPITERS TRANSITING HIGH-JITTER STARS , 2011, 1106.1212.

[13]  B. Scott Gaudi,et al.  EXOFAST: A Fast Exoplanetary Fitting Suite in IDL , 2012, 1206.5798.

[14]  E. Agol,et al.  Qatar-1: indications for possible transit timing variations , 2013, 1309.1457.

[15]  Ralph Neuhäuser,et al.  Transit timing variation in exoplanet WASP-3b , 2010 .

[16]  Institute for Advanced Study,et al.  Targeting Young Stars with Kepler: Planet Formation, Migration Mechanisms and the Early History of Planetary Systems , 2013, 1309.1520.

[17]  The Detectability of Transit Depth Variations due to Exoplanetary Oblateness and Spin Precession , 2010, 1005.1663.

[18]  P. Etzel,et al.  Photometric orbits of seven detached eclipsing binaries , 1981 .

[19]  STK: A new CCD camera at the University Observatory Jena , 2009, 1004.2390.

[20]  S. Hellmich,et al.  CONSTRAINTS ON A SECOND PLANET IN THE WASP-3 SYSTEM , 2013, 1309.6733.

[21]  S. Hinkley,et al.  FRIENDS OF HOT JUPITERS. I. A RADIAL VELOCITY SEARCH FOR MASSIVE, LONG-PERIOD COMPANIONS TO CLOSE-IN GAS GIANT PLANETS , 2013, 1312.2954.

[22]  Aisey M Andel.  ANALYTIC LIGHTCURVES FOR PLANETARY TRANSIT SEARCHES , 2002 .

[23]  Eric B. Ford,et al.  An Analysis of Jitter and Transit Timing Variations in the HAT-P-13 System , 2011 .

[24]  CTK - A new CCD Camera at the University Observatory Jena , 2009, 0903.4116.

[25]  D. Kipping.  Morphological Lightcurve Distortions due to Finite Integration Time , 2010, 1004.3741.

[26]  Astrophysics,et al.  Systemic: A Testbed for Characterizing the Detection of Extrasolar Planets. I. The Systemic Console Package , 2009, 0907.1675.

[27]  John Southworth,et al.  Homogeneous studies of transiting extrasolar planets – I. Light-curve analyses , 2008, 0802.3764.

[28]  B. Krauskopf,et al.  Proc of SPIE , 2003 .

[29]  Paul B. Etzel,et al.  A Simple Synthesis Method for Solving the Elements of Well-Detached Eclipsing Systems , 1981 .

[30]  J. Chambers.  A hybrid symplectic integrator that permits close encounters between massive bodies , 1999 .

[31]  Oscar Straniero,et al.  The alpha -enhanced Isochrones and Their Impact on the FITS to the Galactic Globular Cluster System , 1993 .

[32]  Ch. Adam,et al.  Analysis of new high-precision transit light curves of WASP-10 b: starspot occultations, small planetary radius, and high metallicity , 2011, 1109.4749.

[33]  Joshua N. Winn,et al.  PARAMETER ESTIMATION FROM TIME-SERIES DATA WITH CORRELATED ERRORS: A WAVELET-BASED METHOD AND ITS APPLICATION TO TRANSIT LIGHT CURVES , 2009, 0909.0747.

[34]  G. Dálya,et al.  Multiple planets or exomoons in Kepler hot Jupiter systems with transit timing variations , 2012, 1207.7229.

[35]  E. Ford,et al.  Kepler constraints on planets near hot Jupiters , 2012, Proceedings of the National Academy of Sciences.

[36]  Drake Deming,et al.  Extrasolar Planet Transits Observed at Kitt Peak National Observatory , 2012, 1202.2799.

[37]  W. P. Chen,et al.  The Young Exoplanet Transit Initiative (YETI) , 2011, 1106.4244.

[38]  Geza Kovacs,et al.  HAT-P-13b,c: A TRANSITING HOT JUPITER WITH A MASSIVE OUTER COMPANION ON AN ECCENTRIC ORBIT , 2009, 0907.3525.

[39]  Raetz,et al.  High-precision photometry of WASP-12 b transits , 2011 .

[40]  Klaus G. Strassmeier,et al.  The STELLA robotic observatory on Tenerife , 2010, Other Conferences.

[41]  E. Agol,et al.  Analytic Light Curves for Planetary Transit Searches , 2002, astro-ph/0210099.