Some preliminary results from the exochannel Run LRc

Summary Thousands of LCs analyzed « by hand » and visual inspection: l 20

E 1 -0523: The light-curve Period = 4. 25 days - Depth = 0.

E 1 -0523: CS 25 - 24/09/07 the folded signal No secondary transit down

E 1 -0523: best fitting Period: 4. 25 days l Duration: 3. 8 hours

E 1 -0523: radial velocities Star: m. V = 13 - G 2 V

E 2 -0192: A planet around a K star … ~ 1 month ~

E 2 -0192: low frequencies variations Two frequencies: • 4. 5 days • ~

E 2 -0192: The transit signal After detrending from the low frequency variations CS

E 2 -0192: the folded light curve Depth: ~ 3% Dur. : 2. 2

E 2 -0192: radial velocities Star: m. V = 12. 6 - K 0

E 2 -0192: Where exoplanets meet seismology l l Period of the planet: 1.

Slides: 12

Download presentation

Some preliminary results from the exochannel Run: LRc 01 Data: R. Alonso, R. Cautain, P-Y Chabaud, L. Jorda, C. Surace, … Follow-up: CEST follow up team CS 25 - 24/09/07 1

Summary Thousands of LCs analyzed « by hand » and visual inspection: l 20 transit candidates identified ð ð 7 candidates with a period less than 5 days 4 candidates with 5 < P < 10 days 5 with 10 < P < 27 days 3 single transit events Follow up of the candidates using: l Photometry : IAC 80 cm, Wise 1 m, BEST • l Spectroscopy : Tautenburg, SOPHIE, HARPS l Archived data : BEST (1 candidate), EXODAT Up to now: two completely confirmed planets CS 25 - 24/09/07 2

E 1 -0523: The light-curve Period = 4. 25 days - Depth = 0. 4% CS 25 - 24/09/07 3

E 1 -0523: CS 25 - 24/09/07 the folded signal No secondary transit down to the 1. 5 e-4 level (6 sigma) 4

E 1 -0523: best fitting Period: 4. 25 days l Duration: 3. 8 hours l Depth: 0. 4 % l Incl: 88. 98 ° l CS 25 - 24/09/07 5

E 1 -0523: radial velocities Star: m. V = 13 - G 2 V l If a solar type star: Planet mass ~ 17 Mjup Planet radius ~ 0. 6 Rjup !! !! CS 25 - 24/09/07 6

E 2 -0192: A planet around a K star … ~ 1 month ~ 4 months ~ 1 Week CS 25 - 24/09/07 7

E 2 -0192: low frequencies variations Two frequencies: • 4. 5 days • ~ 50 days After removing the transit signals Beat of two components CS 25 - 24/09/07 8

E 2 -0192: The transit signal After detrending from the low frequency variations CS 25 - 24/09/07 9

E 2 -0192: the folded light curve Depth: ~ 3% Dur. : 2. 2 h No secondary transit down to the 1. e-4 level (6 sigma) CS 25 - 24/09/07 10

E 2 -0192: radial velocities Star: m. V = 12. 6 - K 0 V l Radial velocity curve ð Planet confirmed ð Rossiter effect is measurable Prot ~ 4. 5 days CS 25 - 24/09/07 l Planet mass ~ 2. 5 Mjup l Planet radius ~ 1. 3 Rjup 11

E 2 -0192: Where exoplanets meet seismology l l Period of the planet: 1. 74 days Star rotation period: 4. 5 days Commensurability of the period with the star rotation period 3 x. Prot ~ 8 x. Pkep l Resonant tides … excitation of g-modes ? l Modulation by dark spots and active regions on the star surface ? CS 25 - 24/09/07 12