KOINet Study of exoplanetary systems via transit timing variations - PowerPoint PPT Presentation

KOINet Study of exoplanetary systems via transit timing variations Carolina von Essen, Simon Albrecht & the KOINet collaboration Stellar Astrophysics Centre, Aarhus University Lund, May 2015

Transit timing variations (TTVs)

Transit timing variations (TTVs)

Transit timing variations (TTVs)

TTVs in the Kepler era Kepler-36b, c, Carter, J. A. et al., Science , 337, 556, 2012. Rocky super Earth and Neptune gas giant. Planets close to 6:7 resonance. ∆ sma ∼ 0.013 AU, but ρ K 36 b ∼ 8 ρ K 36 c . Migration mechanisms? K b = 1 m/s, K c = 2 m/s, V ∼ 12 → NO RVs!

TTVs in the Kepler era Kepler-9b, c, Holman, M. J. et al., Science , 330, 51, 2010. Kepler-9b, c, Dreizler & Ofir (2014), revisited 60% the mass with six times more data.

Uncharacterized KOIs

KOINet: Kepler Object of Interest Network - Environmentally friendly! :-) Telescope “recycling”. - In-kind telescope time. - Regular proposals via collaborations.

From target selection to data handling 16 1000 TTV semi-amplitude (min) 15 100 14 K mag 16 13 1000 TTV semi-amplitude (min) 10 15 12 100 14 1 11 K mag 0.1 1.0 3.0 9.0 13 Transit depth (ppt) 10 Mazeh, T. et al., ApJS , 208, 16, 2013. 12 1 11 1.0 3.0 9.0 - KOIs to telescopes. Transit depth (ppt) - State of the art data reduction pipeline (DIP 2 OL). - Dynamical analysis: MERCURY. - Mid-time transit fitting only .

From target selection to data handling 1.006 1.006 1.004 1.004 1.002 1.002 Normalized flux Normalized flux 1 1 0.998 0.998 0.996 0.996 0.994 0.994 0.992 0.992 0.99 0.99 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 Hours from transit Hours from transit 17 Orbital inclination (deg) 85.5 Semimajor axis (a/R S ) KOI-0410.01 KOI-0410.01 16 85 15 84.5 14 84 13 83.5 83 12 82.5 11 -100 -50 0 50 100 -100 -50 0 50 100 Epoch Epoch 7.228 Orbital period (days) KOI-0410.01 7.224 7.22 7.216 7.212 7.208 -100 -50 0 50 100 Epoch

KOINet: results 2014 campaign 700 KOI-0902.01 Parabolic fit Best-fit model 600 Sinusoidal fit 1.005 Our prediction Prediction Normalized flux 500 0.8m IAC, Spain 400 O-C [min] 1 300 200 0.995 100 0 0.99 -100 -200 0 500 1000 1500 2000 2500 -4 -2 0 2 4 6 BJD - 2454833 Hours from transit 1.015 KOI-0410.01 10 Best-fit model 1.01 Our prediction 5 Normalized flux 1.005 O-C [min] 0 -5 1 -10 Sinusoidal fit 0.995 Parabolic fit -15 Prediction 0.99 2m Liverpool Telescope -20 0 500 1000 1500 2000 2500 -2 -1 0 1 2 3 4 Hours from transit BJD - 2454833 1.004 KOI-0525.01 100 1.003 Best-fit model Our prediction Normalized flux 1.002 50 1.001 O-C [min] 0 1 -50 0.999 Sinusoidal fit 0.998 Parabolic fit -100 Prediction 0.997 ARC 3.5m -150 0.996 0 500 1000 1500 2000 2500 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 Hours from transit BJD - 2454833

The collaboration Stefan Dreizler, Institute for Astrophysics Goettingen, Germany Aviv Ofir, Weizmann Institute of Science, Israel Katja Poppenhaeger, Harvard-Smithsonian Center for Astrophysics, United States of America Hans Deeg, Instituto de Astrofsica de Canarias, Espaa Eric Agol, Univ. of Washington, United States of America Simon Albrecht, Aarhus University, Denmark Andrew Becker, Univ. of Washington, United States of America Varun Bhalerao, Inter-University Centre for Astronomy and Astrophysics, India Artem Burdanov, Ural State University, Russia Frederick Chromey, Vassar College, United States of America Camilo Delgado-Correal, Universidad de Ferrara, Italy Ranjan Gupta, Inter-University Centre for Astronomy and Astrophysics, India Sheng-hong Gu, Chinese Academy of Sciences, China Rene Heller, Origins Institute, McMaster University, Canada Jesus Hernandez, Centro de Investigaciones de Astronomia, Venezuela Sergio Hoyer, Instituto de Astrof´ ısica de Canarias, Espa˜ na Ajit Kembhavi, Inter-University Centre for Astronomy and Astrophysics, India Sara Khalafinejad, Hamburger Sternwarte, Germany Vadim Krushinsky, Ural State University, Russia Matthias Mallonn, Institute for Astrophysics Potsdam, Germany Sergio Montfar, Facultad de Ciencias Astron´ omicas y Geof., Argentina Brett Morris, Univ. of Washington, United States of America Maximiliano L. Moyano D’Angelo, Univ. Catolica del Norte, Chile Vaishali Parkash, Institute for Astrophysics Goettingen, Germany Alexander Popov, Ural State University, Russia Lalitha Sairam, Tata Institute of Fundamental Research, India Kulinder Pal Singh, Tata Institute of Fundamental Research, India Raghunathan Srianand, Inter-University Centre for Astronomy and Astrophysics, India Lev Tal-Or, Tel Aviv University, Israel Sven Wedemeyer-Bohm, Institute of Theoretical Astrophysics, Norway

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