J/ApJ/694/1559 Photometric follow-up observations of GJ 436b (Shporer+, 2009)
Photometric follow-up observations of the transiting Neptune-mass planet
GJ 436b.
Shporer A., Mazeh T., Pont F., Winn J.N., Holman M.J., Latham D.W.,
Esquerdo G.A.
<Astrophys. J., 694, 1559-1565 (2009)>
=2009ApJ...694.1559S 2009ApJ...694.1559S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, VRI
Keywords: stars: individual (GJ 436) - planetary systems
Abstract:
This paper presents multiband photometric follow-up observations of
the Neptune-mass transiting planet GJ 436b, consisting of five new
ground-based transit light curves obtained in 2007 May. Together with
one already published light curve, we have at hand a total of six
light curves, spanning 29 days. The analysis of the data yields an
orbital period P=2.64386±0.00003 days, midtransit time
Tc[HJD]=2454235.8355±0.0001, planet mass
Mp=23.1±0.9M{earth}=0.073±0.003MJup, planet radius
Rp=4.2±0.2R{earth}=0.37±0.01RJup, and stellar radius
Rs=0.45±0.02R☉. Our typical precision for the midtransit
timing for each transit is about 30s. We searched the data for a
possible signature of a second planet in the system through transit
timing variations (TTV) and variation of the impact parameter. The
analysis could not rule out a small, of the order of a minute, TTV and
a long-term modulation of the impact parameter, of the order of
+0.2yr-1.
Description:
In addition to the transit of UT 2007 May 2, which was reported by
Gillon et al. (2007A&A...472L..13G 2007A&A...472L..13G) and was the first complete transit
observation of GJ 436b, we obtained five complete transit light curves
of four different transit events. We observed the transits of UT 2007
May 4 and May 25 with the Wise Observatory 1m telescope, located in
Israel. The transit of UT 2007 May 4 was simultaneously observed with
the Wise Observatory 0.46m telescope operated remotely. On UT 2007 May
23 and May 31 we used the 1.2m telescope at the Fred L. Whipple
Observatory (FLWO) on Mount Hopkins, Arizona.
Objects:
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RA (2000) DE Designation(s)
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11 42 11.1 +26 42 24 GJ 436b = GJ 436 b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 1582 Photometry of GJ 436b
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See also:
J/A+A/507/481 : GJ 436b and XO-1b transits (Caceres+, 2009)
J/ApJ/689/L149 : Parameter variations of Gliese 436b transits (Coughlin+, 2008)
J/A+A/486/1039 : HST transit light curve for GJ436b (Bean+, 2008)
J/A+A/471/L51 : Spitzer observations of the hot Neptune GJ 436b (Gillon+,
2007)
J/A+A/475/1125 : Characterization of the hot Neptune GJ 436b (Demory+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Obs Observatory
12- 16 A5 --- Filt Filter used in observation (R,V,z or Clear)
18- 31 F14.6 d HJD Heliocentric Julian Date of observation
33- 38 F6.4 --- RFlux Relative flux in Filt
40- 45 F6.4 --- e_RFlux Error in RFlux
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Mar-2011