J/A+A/507/481 GJ 436b and XO-1b transits (Caceres+, 2009)
High Cadence Near Infrared Timing Observations of Extrasolar Planets:
I. GJ 436b and XO-1b.
Caceres C., Ivanov V.D., Minniti D., Naef D., Melo C., Mason E., Selman F.
<Astron. Astrophys. 507, 481 (2009)>
=2009A&A...507..481C 2009A&A...507..481C
ADC_Keywords: Planets ; Photometry, infrared
Keywords: stars: planetary systems - stars: individual: GJ 436
methods: observational - stars: individual: XO-1b
Abstract:
Currently the only technique sensitive to Earth mass planets around
nearby stars (that are too close for microlensing) is the monitoring
of the transit time variations of the transiting extrasolar planets.
We search for additional planets in the systems of the hot Neptune GJ
436b, and the hot-Jupiter XO-1b, using high cadence observations in
the J and KS bands. New high-precision transit timing measurements are
reported: GJ 436b Tc=2454238.47898±0.00046HJD;
XO-1b Tc(A)=2454218.83331±0.00114HJD,
Tc(B)=2454222.77539±0.00036HJD, Tc(C)=2454222.77597±0.00039HJD,
Tc(D)=2454226.71769±0.00034HJD, and they were used to derive new
ephemeris. We also determined depths for these transits. No
statistically significant timing deviations were detected. We
demonstrate that the high cadence ground based near-infrared
observations are successful in constraining the mean transit time to
30s, and are a viable alternative to space missions.
Description:
File table2 contains all the data points from the obtained light
curves of the transiting planets GJ 436b, and XO-1b. It includes the
HJD of observation, the normalized to the out-of-transit average flux,
and the photometry error estimation. It starts with the only
observation of planet GJ 436b, following the four runs of the planet
XO-1b (A to D).
Objects:
---------------------------------------------------------------------
RA (2000) DE Designation(s) (Files Periods)
---------------------------------------------------------------------
11 42 11.1 +26 42 24 GJ 436b = GJ 436 b (table2a P=2.6438986)
16 02 11.8 +28 10 10 XO-1b = XO-1b (table2b P=3.9415128)
---------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2a.dat 45 35266 GJ 436b Transit light curves
table2b.dat 45 333441 XO-1b Transit light curves
--------------------------------------------------------------------------------
See also:
J/A+A/471/L51 : Spitzer obs. of the hot Neptune GJ 436b (Gillon+, 2007)
J/A+A/475/1125 : Characterization of the hot Neptune GJ 436b (Demory+, 2007)
J/A+A/486/1039 : HST transit light curve for GJ436b (Bean+, 2008)
J/MNRAS/384/1097 : SuperWASP-North extrasolar planet candidates (Kane+, 2008)
Byte-by-byte Description of file: table2?.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Target Target name
8 A1 --- Run [ABCD] Run number for XO-1b
12- 25 F14.6 d HJD Heliocentric Julian Date
27- 35 F9.6 --- Flux Normalized flux
37- 45 F9.6 --- e_Flux Flux error estimation
--------------------------------------------------------------------------------
Acknowledgements:
Claudio Caceres, cccacere(at)astro.puc.cl
(End) Patricia Vannier [CDS] 22-May-2009