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 ρK36b ∼ 8ρK36c. Migration mechanisms? Kb = 1 m/s, Kc = 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

0.1 1.0 3.0 9.0 Transit depth (ppt) 1 10 100 1000 TTV semi-amplitude (min) 11 12 13 14 15 16 Kmag 1.0 3.0 9.0 Transit depth (ppt) 1 10 100 1000 TTV semi-amplitude (min) 11 12 13 14 15 16 Kmag Mazeh, T. et al., ApJS, 208, 16, 2013.

• KOIs to telescopes.
• State of the art data reduction pipeline (DIP2OL).
• Dynamical analysis: MERCURY.
• Mid-time transit fitting only.

From target selection to data handling

0.99 0.992 0.994 0.996 0.998 1 1.002 1.004 1.006

• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2 Normalized flux Hours from transit 0.99 0.992 0.994 0.996 0.998 1 1.002 1.004 1.006

• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2 Normalized flux Hours from transit

11 12 13 14 15 16 17

• 100
• 50

50 100 Semimajor axis (a/RS) Epoch KOI-0410.01 82.5 83 83.5 84 84.5 85 85.5

• 100
• 50

50 100 Orbital inclination (deg) Epoch KOI-0410.01 7.208 7.212 7.216 7.22 7.224 7.228

• 100
• 50

50 100 Orbital period (days) Epoch KOI-0410.01

KOINet: results 2014 campaign

0.99 0.995 1 1.005

• 4
• 2

2 4 6 Normalized flux Hours from transit KOI-0902.01 Best-fit model Our prediction

• 200
• 100

100 200 300 400 500 600 700 500 1000 1500 2000 2500 O-C [min] BJD - 2454833 Parabolic fit Sinusoidal fit Prediction 0.8m IAC, Spain 0.99 0.995 1 1.005 1.01 1.015

• 2
• 1

1 2 3 4 Normalized flux Hours from transit KOI-0410.01 Best-fit model Our prediction

• 20
• 15
• 10
• 5

5 10 500 1000 1500 2000 2500 O-C [min] BJD - 2454833 Sinusoidal fit Parabolic fit Prediction 2m Liverpool Telescope 0.996 0.997 0.998 0.999 1 1.001 1.002 1.003 1.004

• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2 Normalized flux Hours from transit KOI-0525.01 Best-fit model Our prediction

• 150
• 100
• 50

50 100 500 1000 1500 2000 2500 O-C [min] BJD - 2454833 Sinusoidal fit Parabolic fit Prediction ARC 3.5m

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´

• micas 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

koinet.astro.physik.uni-goettingen.de