XO-2

XO-2
AXA Light Curves & Finder Charts & All-Sky Photometry

Links internal to this web page
    Comments
    Basic data
    List of observations
    Transit LCs
    Out-of-transit LCs
    All-sky photometry
    Finder image

Basic data

    RA = 07:48:06.5, Decl = +50:13:33
    Season = Jan 16
    B = 12.00 ± 0.03, V = 11.18 ± 0.035, Rc = 10.69 ± 0.025, Ic = 10.32 ± 0.025, B-V = 0.82 ± 0.05 (B. Gary, all-sky)
    HJDo = 4147.74902 (2) and P = 2.615838 (8) days (Schneider's Extrasolar Planets Encyclopedia)
    HJDo = 4453.80491 (38) and P = 2.6158538 (18) days (Suggested new ephemeris based on AXA fit, below)
    Depth = 14.2 ± 0.3 mmag
    Length = 2.65 ± 0.03 hr
    Fp = 0.21 (4), F2 = 0.72 (10)

Comments

Timing of transits are well-behaved, so far.
OOT LCs show nothing statistically significant, so far.

Table of observations

Light Curves

9B27WPK

This is a combination of the previous two transit datta sets.

9117FC22

9117FC21

9112MQZ1

8c29SBL1 Bart's clock must have been set off by one hour (we all do this occasionally).

Excellent! This is the best amateur LC that I've ever seen! Notice the abrupt ingress and egress changes and the strong limb darkening shape.

First submission by this group (Barbieri, Borsi, Conti, Marchini & Marchini). Good job considering full moon and V-band.

First submission by Staels; great quality LC!

Perfect agreement with consensus!

High air mass at beginning, poor seeing & wind at end that terminated obsns.

Unusually flat OOT for BB-filter.

7820HVP1

Note: The ingress/egress ticks on the following plots are at the wrong times; this will eventually be fixed.

This is the first LC observation made of XO-2 (after it was identified by the XO Project as a candidate using wide-field camera observations).

Out-of-Transit (OOT)

I was asleep when the computer "froze."

9109FC21

Before ingress.

Finder Image

FOV = 25.5 x 18.7 'arc. XO-2 is indicated. It's same color binary companion is 31 "arc to the south and is 0.08 mag brighter. The companion is an ideal reference star since it's close-by, same brightness and same color.

All-Sky Photometry

Beware of Star #10 which is a small-amplitude, short-period variable (30 mmag amplitude, 1 hour period). Don't use it as a reference star.

"Comp" is the star 31"arc to the south.

References

Fernandez et al, 2009: http://fr.arxiv.org/abs/0903.2687

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WebMaster: Bruce L. Gary. Nothing on this web page is copyrighted. This site opened: July 04, 2007. Last Update: 2009.11.30