AXA Light Curves

Basic data

Table summary of transit measurements

Transit LCs - Amateurs

Transit LCs - Professionals

OOT LC

Finder image

Season = February 07

V = 8.5, B-V =

HJDo = 4876.323 (35), Gillon (2009) global MCMC fit (reference below)

P = 111.43637 (34) day, Gillon (2009) global MCMC fit

Depth = 10.6 +- 0.8 mmag, Gillon (2009) global MCMC fit

Length = 12.6 +- 1.7 hr, Gillon (2009) global MCMC fit

2010.05.05-hd80606-M14(cbb)-pro

Same data is plotted in next graph.

9924HVP See previous graph for calification of UT coverage.

9924GBL A "no show" for predicted ingress.

9213GM21 This is my fit to Garcia-Melendo's data when a +3.5 mmag meridian flip zero-shift was applied to data after 24.9 UT. Zero shifts matter and the reduced chi-square criterion allows for a wide range of zero-shift values. Consequently, uncertainties for mid-transit time, length and depth are greater than for any single zero-shift assumption (using chi-square). My subjective interpretation is that mid-transit HJD = 4876.30 +- 0.15, length = 11 +- 2 hrs, depth = 8.9 +- 0.5 mmag. The publication by Garcia-Melendo & McCullough give 4876.33 +-?, 11.3 +- ? and 10 +-? mmag.

This is my fit to Garcia-Melendo's data. Thanks, Enrique, for sharing your data with AXA. No zero shift was applied to meridian flip at 24.9 UT, as suggested by Garcia-Melendo.

*After egress (beginning of observations ~1.1 hrs after egress).*

*Before ingress (end of observations ~10 hrs before ingress).*

*HD 80606 and HD 80607 are a binary pair 20 "arc apart. FOV =
30 x 20 'arc, north up, east left.*

Since Arizona observers failed to see an egress on the day before the Europeans observed egress it is possible to place an upper limit on transit length: L <= 12 hours. This is illustrated by a graph that Greg Laughlin posted on his oklo web site. Here's a "lift" from that web page:

This helps constrain the "impact parameter" (ratio = closest arc distance to star center ÷ star radius) to ~ 0.85.

Gillon, M., 2009, "Spin-orbit missalignment for the transiting planet HD 80606b": http://fr.arxiv.org/abs/0906.4904

Moutou et al http://arxiv.org/abs/0902.4457

Fossey et al http://exoplanet.eu/papers/fossey.pdf

Garcia & McCullough, 2009 http://arXiv.org/abs/0902.4493

Hebrard et al, 2010 http://fr.arxiv.org/abs/1004.0790

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